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Chip Resistor Selection Guide

General Purpose Chip-R

Series

Size

Rated Power

TCR (ppm/

Tolerance

Resistance

±100

±1%

WR25X

2512 (6432)

±200

±5%

±100

±1%

WR18X

1218 (3248)

±200

±5%

±100

±1%

WR20X

2010 (5025)

1/2W

±200

±5%

±100

±1%

WR10X

1210 (3225)

1/3W

±200

±5%

±100

±1%

WR12X

1206 (3216)

1/4W

±5%

±100

±1%

WR08X

0805 (2012)

1/8W

±5%

±100

±1%

WR06X

0603 (1608)

1/10W

±5%

±100

±1%

WR04X

0402 (1005)

1/16W

±5%

±200

±1%

WR02X

0201 (0603)

1/20W

±200

±5%

1 ~ 10M

±200

±1%

WR01X

01005 (0402)

1/32W

±200

±5%

4.7 ~ 1M

Remark:

1. Detailed resistance vs. TCR and ordering code please refer to specific specifications.

2. Jumper resistor is not designed for fusing applications, designers shall apply dedicate fusible resistor or standard fuse in

3. WRxxW defines for ±1% < 10ohm or > 1Mohm.

application circuits.

Thick Film Low Ohm Chip-R

Remark:

1. Detailed resistance vs. TCR and ordering code please refer to specific specifications.

2. Resistance value will be changed by soldering condition and design of soldering pad, please design products in consideration of this change.

Thick Film Power Low Ohm Chip-R

Series

Size

Rated Power

TCR (ppm/

)

Tolerance

Resistance

±1%, ±5%

0.047 ~ 0.976

WW25P

2512 (6432)

< 0.1 : 150ppm

0.1 : 100ppm

0.047 ~ 0.976

WW20P

2010 (5025)

< 0.1 : 150ppm

0.1 : 100ppm

0.020 ~ 0.976

WW10P

1210 (3225)

1/2W

< 0.1 : 500ppm

0.1 : 200ppm

0.020 ~ 0.976

WW12P

1206 (3216)

1/2W

< 0.1 : 200ppm

0.1 : 100ppm

0.047 ~ 0.976

WW08P

0805 (2012)

1/3W

< 0.1 : 200ppm

0.1 : 150ppm

0.047 ~ 0.976

WW06P

0603 (1608)

1/4W

< 0.1 : 250ppm

0.1 : 200ppm

0.100 ~ 0.976

WW04P

0402 (1005)

1/8W

< 0.1 : 300ppm

0.1 : 200ppm

< 0.02 : 150ppm

!!"! #!$!!

WW12C

1206 (3216)

1/2W

0.02 : 100ppm

WW08C

0805 (2012)

1/3W

WW06C

0603 (1608)

1/4W

WW04C

0402 (1005)

1/8W

< 0.03 : 200ppm

0.03 : 100ppm

WW02C

0201 (0603)

1/10W

< 0.051 : 0~+250ppm

0.051 : ±150ppm

< 0.051 : 0~+350ppm

0.051 : ±150ppm

±1%, ±5%

!!$! #!$!!

!!"& #!$!!

Series

Size

Rated Power

TCR (ppm/

)

Tolerance

Resistance

0.015 ~ 0.976

WW25X
WW25W

2512 (6432)

0.010 ~ 0.100

±1%

0.020 ~ 0.976

WW18X

1218 (3248)

±5%

0.015 ~ 0.976
0.020 ~ 0.976

2010 (5025)

0.010 ~ 0.100
0.020 ~ 0.976

1210 (3225)

0.020 ~ 0.100
0.010 ~ 0.976

1206 (3216)

0.010 ~ 0.100
0.020 ~ 0.976

0805 (2012)

1/8W

0.050 ~ 0.100
0.100 ~ 0.976

0603 (1608)

1/10W

0.050 ~ 0.100

WW04X

0402 (1005)

1/16W

WW20X
WW20W

WW10X
WW10W

1/3W
2/3W

WW12X
WW12W

WW08X
WW08W

WW06X
WW06W

1/4W
1/3W

1/2W
3/4W

!#'&!!

*&-;!!"!#!$!!=
*$-;!!?!#!$!!=

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Remark:

1. Detailed resistance vs. TCR and ordering code please refer to specific specifications.
2. Resistance value will be changed by soldering condition and design of soldering pad, please design products in consideration of this change.

Chip Attenuator

Series

Size

Type

Termination

Tolerance

Attenuation

Impedance

WA04P

0404 (0402x2)

4P3R, @ type

Convex

±0.1dB ~ 2.5dB

0, 0.5dB ~ 20dB

50=

Chip Resistor Network

Series

Size

Rated Power

TCR (ppm/

)

Termination

Tolerance

Resistance

WT04X

1206 (10P8R)

1/16W

±200

Convex

±5%

10 ~ 100K=

High Power Chip-R

Series

Size

Rated Power

TCR (ppm/

)

Tolerance

Resistance

WF25P

2512 (6432)

±100

WF20P

2010 (5025)

±100

WF10P

1210 (3225)

1/2W

±100

WF12P

1206 (3216)

1/2W

±100

WF08P

0805 (2012)

1/4W

±100

WF06P

0603 (1608)

1/8W

±100

WF04P

0402 (1005)

1/8W

±100

±1%, ±5%

Jumper; 1 ~ 1M=

ˍġ

Metal Low Ohm Sensing Type Chip-R

Series

Size

Rated Power

TCR (ppm/

Tolerance

Resistance

WW25N

±1%, ±5%

WW25R

±1%, ±5%

WW25M

±1%, ±5%

3, 5, 10, 15, 20, 25, 50m=

3, 5, 10, 15, 20, 25m=

WW25Q

2512 (6432)

±1%, ±5%

1, 2, 3, 4, 5, 6, 7, 8, 9, 10,

11, 12, 13, 14, 15m=

WW20N

2010 (5025)

±1%, ±5%

5, 10, 15, 20m

WW59M

5931 (15079)

±1%, ±5%

"H&=

WW12N

±70

±1%, ±5%

5, 10, 15, 20, 25m=

WW12R

±1%, ±5%

1 ~ 15=

WW12D

1206 (3216)

±1%, ±5%

20, 25, 30, 40, 50m=

WW08D

1/2W

±1%, ±5%

4, 5, 10m=

WW08R

1/2W

±1%, ±5%

WW06R

0603 (1608)

1/3W

±1%, ±5%

5, 10, 15m=

Remark:

±75

±70

$"H?&LOSU$!=

Anti-Sulfuration Chip-R ( Details please refer Anti-sulfur resistor introduction )

1206 (3216)

1/4W

200

±1%, ±5%

1~ 10M=

SR08

0805 (2012)

1/8W

200

±1%, ±5%

1~ 10M=

2010 (5025)

1/2W

200

±1%, ±5%

1~ 10M=

SR25

2512 (6432)

200

±1%, ±5%

1~ 10M=

SR06

0603 (1608)

1/10W

200

±1%, ±5%

1~ 10M=

SR04

0402 (1005)

1/16W

200

±1%, ±5%

1~ 10M=

Surge Chip-R

Series

Size

Rated Power

TCR(ppm/

)

Tolerance

Resistance

WK25S

2512 (6432)

200

0.27 ~ 22M=

WK20S

2010 (5025)

3/4W

200

0.27 ~ 22M=

WK10S

1210 (3225)

1/2W

200

0.27 ~ 22M=

WK12S

1206 (3216)

1/3W

200

0.27 ~ 22M=

WK08S

0805 (2012)

1/4W

200

0.27 ~ 22M=

Series

Size

Rated Power

TCR(ppm/

)

Tolerance

Resistance

SR12

SR20

0805 (2012)

20, 25, 30, 40, 50m=

±70

±75

±70

±75

±5%, ±10%, ±20%

Automotive Chip-R ( Details please refer Automotive resistor introduction )

MR12

1206 (3216)

1/4W

±200

1~ 10M=

MR08

0805 (2012)

1/8W

±200

1~ 10M=

MR10

1210 (3225)

1/2W

±200

1~ 10M=

MR18

1218 (3248)

±200

1~ 10M=

MR20

2010 (5025)

1/2W

±200

1~ 10M=

MR25

2512 (6432)

±200

1~ 10M=

MR04R

0402 (1005)

1/16W

±25

?!=#H!Z=

MR06R

0603 (1608)

0.15W

±25

?!=#$!!Z=

MR06

0603 (1608)

1/10W

±200

1~ 10M=

MR04

0402 (1005)

1/16W

±200

±0.05%, 0.1%, 0.25%, 0.5%
±0.05%, 0.1%, 0.25%, 0.5%

1%, ±5%

1~ 10M=

Series

Size

Rated Power

TCR(ppm/

)

Tolerance

Resistance

Chip Resistor Array

Series

Size

Rated Power

TCR (ppm/

)

Termination

Tolerance

Resistance

WA06X

1206 (0603x4)

1/10W

±200

Convex

±1%, ±5%

WA06T

1206 (0603x4)

1/10W

±200

Concave

±1%, ±5%

WA06Y

0606 (0603x2)

1/10W

±200

Convex

±1%, ±5%

WA04X

0804 (0402x4)

1/16W

±200

Convex

±1%, ±5%

WA04T

0804 (0402x4)

1/16W

±300

Concave

±1%, ±5%

WA04Y

0404 (0402x2)

1/16W

±200

Convex

±1%, ±5%

WA04F

0804 (0402x4)

1/16W

±300

Reverse Concave

±1%, ±5%

WA04U

0404 (0402x2)

1/16W

±300

Concave

±1%, ±5%

WA04G

0804 (0402x2)

1/16W

±300

±1%, ±5%

10 ~ 1M=

WA06W

1606 (0402x8)

1/16W

±200

Convex

±1%, ±5%

10 ~ 100K=

WA02F

0602 (0201x4)

1/32W

±200

Reverse Flat
Reverse Flat

±1%, ±5%

WA02G

0202 (0201x2)

1/32W

±200

±1%, ±5%

±5%: 10 ~ 1M=^
±1%: 10 ~ 100Z=

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Chip Resistors

High Precision Chip-R

Series

Size

Rated Power

TCR(ppm/

)

Tolerance

Resistance

WF12H

1206 (3216)

1/4W

100

±0.1%, ±0.5%

10 ~ 1M=

WF10H

1210 (3225)

1/3W

100

±0.1%, ±0.5%

10 ~ 1M=

WF08H

0805 (2012)

1/8W

100

±0.1%, ±0.5%

10 ~ 1M=

WF06H

0603 (1608)

1/10W

100

±0.1%, ±0.5%

10 ~ 1M=

WF04H

0402 (1005)

1/16W

100

±0.1%, ±0.5%

10 ~ 1M=

WF25T

2512 (6432)

3/4W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1.5M=

WF25Q

2512 (6432)

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1.5M=

WF20T

2010 (5025)

1/2W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1.5M=

WF20Q

2010 (5025)

3/4W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1.5M=

WF10T

1210 (3225)

1/4W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1M=

WF10Q

1210 (3225)

2/5W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1M=

WF12T

1206 (3216)

1/8W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 1M=

WF12Q

1206 (3216)

1/4W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 1M=

WF08T

0805 (2012)

1/10W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 1M=

WF08Q

0805 (2012)

1/8W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 1M=

WF06T

0603 (1608)

1/16W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 680K=

WF06Q

0603 (1608)

1/10W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 680K=

WF02T

0201 (0603)

1/20W

?O#$!Z=

?O#&Z=

WF04T

0402 (1005)

1/16W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 100K=

WF25U

2512 (6432)

3/4W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1.5M=

WF25R

2512 (6432)

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1.5M=

WF20U

2010 (5025)

1/2W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1.5M=

WF20R

2010 (5025)

3/4W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1.5M=

WF10U

1210 (3225)

1/4W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1M=

WF10R

1210 (3225)

2/5W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 1M=

WF12U

1206 (3216)

1/8W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 1M=

WF12R

1206 (3216)

1/4W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 1M=

WF08U

0805 (2012)

1/10W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 1M=

WF08R

0805 (2012)

1/8W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 1M=

WF06U

0603 (1608)

1/16W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 680K=

WF06R

0603 (1608)

1/10W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

4.7 ~ 680K=

WF02U

0201 (0603)

1/20W

WF04U

0402 (1005)

1/16W

±0.05%, ±0.10%,±0.25%, ±0.50%, ±1.0%

10 ~ 100K=

WF12F

1206 (3216)

1/8W

±0.05%, ±0.10%,±0.25%

WF08F

0805 (2012)

1/8W

±0.05%, ±0.10%,±0.25%

WF06F

0603 (1608)

1/10W

±0.05%, ±0.10%,±0.25%

WF04F

0402 (1005)

1/16W

±0.05%, ±0.10%,±0.25%

WF12W

1206 (3216)

1/8W

±0.05%, ±0.10%,±0.25%

25 ~ 300K=

WF08W

0805 (2012)

1/8W

±0.05%, ±0.10%,±0.25%

25 ~ 200K=

WF06W

0603 (1608)

1/10W

±0.05%, ±0.10%,±0.25%

25 ~ 100K=

WF04W

0402 (1005)

1/16W

±0.05%, ±0.10%,±0.25%

25 ~ 20K=

WF12Z

1206 (3216)

1/8W

±0.05%, ±0.10%,±0.25%

25 ~ 120K=

WF08Z

0805 (2012)

1/8W

±0.05%, ±0.10%,±0.25%

25 ~ 80K=

WF06Z

0603 (1608)

1/10W

±0.05%, ±0.10%,±0.25%

25 ~ 40K=

WF04Z

0402 (1005)

1/16W

±0.05%, ±0.10%,±0.25%

25 ~ 8K=

"&#H!!Z=
"&#"!!Z=
"&#$!!Z=

"&#"!Z=

±0.10%, ±0.50%

High Ohm Chip-R

Series

Size

Rated Power

TCR(ppm/

)

Tolerance

Resistance

WF12G

1206 (3216)
0805 (2012)
0603 (1608)
0402 (1005)

1/4W

200

$$j#$!!j=
$$j#$!!j=
$$j#$!!j=

$$j#H!j=

1/8W

200

1/10W

200

±1%, ±5%

1/16W

300

±5%

WF08G
WF06G
WF04G

High Voltage Chip-R

Series

Size

Rated Power

TCR(ppm/

)

Voltage (V)

Tolerance

Resistance

WK25N

2512 (6432)

200

2000

±5%, ±10%, ±20%

4.7M ~ 16M=

WK20N

2010 (5025)

1/2W

200

1500

±5%, ±10%, ±20%

1M ~ 16M=

WK25V

2512 (6432)

200

800

±1%, ±5%

47~ 51M=

WK20V

2010 (5025)

1/2W

200

500

±1%, ±5%

47~ 51M=

WK12V

1206 (3216)

1/4W

200

500

±1%, ±5%

47~ 51M=

WK08V

0805 (2012)

1/8W

200

400

±1%, ±5%

47~ 51M=

WK06V

0603 (1608)

1/10W

200

±1%, ±5%

47~ 10M=

Trimmable Chip-R

Series

Size

Rated Power

TCR(ppm/

)

Tolerance

Resistance

WK25M

2512 (6432)

200

0/-20%, 0/-30%

1 ~ 4.7M=

WK20M

2010 (5025)

1/2W

200

0/-20%, 0/-30%

1 ~ 4.7M=

WK10M

1210 (3225)

1/4W

200

0/-20%, 0/-30%

1 ~ 4.7M=

WK12M

1206 (3216)

1/8W

200

0/-20%, 0/-30%

1 ~ 4.7M=

WK08M

0805 (2012)

1/10W

200

0/-20%, 0/-30%

1 ~ 4.7M=

WK06M

0603 (1608)

1/16W

100

0/-20%, 0/-30%

10~ 4.7M=

Total lead free Chip-R ( Pb < 100ppm )

Series

Size

Rated Power

TCR(ppm/

)

Tolerance

Resistance

WR12X_R

1206 (3216)

1/4W

200

±1%, ±5%

1~ 10M=

WR06X_R

0603 (1608)

1/10W

200

±1%, ±5%

1~ 10M=

WR04X_R

0402 (1005)

1/16W

200

±1%, ±5%

1~ 10M=

WR02X_R

0201 (0603)

1/20W

200

±1%, ±5%

1~ 10M=

WA04X_R

0402X4

1/16W

200

±1%, ±5%

10 ~ 1M=

WA06X_R

0603X4

1/10W

200

±1%, ±5%

10 ~ 1M=

WR08X_R

0805 (2012)

1/8W

200

±1%, ±5%

1~ 10M=

WR10X_R

1210 (3225)

1/3W

200

±1%, ±5%

WR20X_R

2010 (5025)

1/2W

WR18X_R

1218 (3248)

WR25X_R

2512 (6432)

10M=

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Thick Film Low Ohm/Power Low Ohm Chip Resistors

Function For Low Ohm Chip Resistors

The low ohmic resistors are used to sense output current in power supply,
automotive and engine control management system, and other power
sensing application. As shows in figure below, the typical function of low
ohmic (power) chip resistor is to be a current sensor (Rsense) to generate
the sensing voltage (Vs) for the purpose of feedback control when output
current (lo) passed on it . The sensing voltage be treated as a signal to
trigger the switches (CMOS) ON/OFF duration so that to monitor and/or
adjust the output current from inductor.
Simplify to say, Vs=Io ×Rsense.
In general case, this feedback voltage is setting around 100mV for
considering both on power saving and noise robustness. To sense a 5
ampere average output current, the Rsense resistance value therefore be
required as 100mV / 5A = 20 m=, the power dissipation will be :

P=I2 ×R =5A2 ×20m= =0.5Watt

A low ohmic chip resistor with a power rating of 1.0 watt is recommended
on this application in case the power safety margin is taken into account.

Quick Reference Data of Low Ohm Chip Resistor

Series No.

WW25X

WW20X

WW18X

WW10X

WW12X

WW08X

WW06X

WW04X

Size code

2512

(6432)

2010

(5025)

1218

(3248)

1210

(3225)

1206

(3216)

0805

(2012)

0603

(1608)

0402

(1005)

Resistance Tolerance

±5% , ±1%

Resistance Range

0.020= ~ 0.976=

0.100= ~ 0.976=

TCR (ppm/

)

Detailed TCR please refer to specific data sheets

Max. dissipation @ Tamb=70

1 Watt

0.5 Watt

1 Watt

1/3 Watt

1/4 Watt

1/8 Watt

1/10 Watt

1/16 Watt

Max. Operation Voltage (DC or RMS)

250V

200V

100V

50V

Operation Temperature

Basic Specification

JIS C 5201-1 / IEC 60115-1

Note :
1.

This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication 60115-9” .

Power derating curve, and detail specification please refer to specific data sheets.

Resistance value will be changed by soldering condition and design of solding pad, please design products in consideration of change of resistance value.

Quick Reference Data of Power Low Ohm Chip Resistor

Item

General Specification

Series No.

WW25P

WW20P

WW12P

WW08P

WW06P

WW04P

Size code

2512 (6432)

2010 (5025)

1206 (3216)

0805(2012)

0603(1608)

0402(1005)

Resistance Tolerance

±5% , ±1%

Resistance Range

0.047= ~ 0.976=

0.1=~0.976=

TCR (ppm/

)

0.100=

±150ppm/

±200ppm/

±250ppm/

0.100=

±100ppm/

±150ppm/

±200ppm/

0~+300ppm/

Max. dissipation @ Tamb=70

2 W

1 W

1/2 W

1/3 W

1/4 W

1/8 W

Max. Operation Voltage (DC or RMS)

300V

200V

150V

50V

Operation Temperature

Note :
1.    This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication 60115-8” .
2.      Max. Operation Voltage : So called RCWW (Rated Continuous Working Voltage) is determined by
                                                      RCWV=

Rater Power

Resistance Value or Max. RCWV listed above, whichever is lower.

3. 2W loading with total solder-pad and trace size of 300mm2

Physical Dimensions

Unit: mm

Dimensions

WW25P

WW20P

WW12P

WW08P

WW06P

WW04P

6.30±0.20

5.00±0.20

3.10±0.15

2.00±0.15

1.60±0.10

1.00±0.05

3.10±0.20

2.50±0.20

1.60±0.15

1.20±0.15

0.80±0.10

0.50±0.05

0.60±0.15

0.60±0.10

0.55±0.10

0.50±0.10

0.45±0.10

0.35±0.05

0.60±0.25

0.50±0.25

0.40±0.20

0.30±0.20

0.20±0.10

1.80±0.25

0.65±0.25

0.50±0.25

0.40±0.20

0.30±0.20

0.25+0.05/-0.1

-55 ~ +155 C

Chip Resistors

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Metal Low Ohm Sensing Chip Resistors (0.001}~ 0.050})

Description

The resistors are constructed in a high grade low resistive metal body. The resistive
layer is covered with a protective coat and printed a resistance marking code over it.
Finally, the two external end terminations are added. For ease of soldering the outer
layer of these end terminations is a lead free terminations.

Quick Reference Data

Item

General Specification

Series No.

WW25M

WW25N

WW20M

WW20N

WW12N

WW12M

Size code

2512 (6432)

2010 (5025)

1206(3216)

Resistance Tolerance

±5% , ±1%

Resistance Range

5, 10, 15, 20m=

5, 10, 15, 20, 25m=

TCR (ppm/

)

75 ppm/

70 ppm/

Max. dissipation @ Tamb=70

1 W

2 W

1/2 W

1 W

1/2 W

Max. Operation Voltage (DC or RMS)

250V

200V

Max. Overload Voltage (DC or RMS)

500V

400V

Operation Temperature

Note :
1.

This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication 60115-8” .

2. Power derating curve, and detail specification please refer to specific data sheets.
3. Resistance value will be changed by soldering condition and design of solding pad, please design products in consideration of chang of resistance value.

Physical Dimensions:

WW25M(0.002}~0.025}), WW25N(0.003}~0.025}), WW20N, WW12N

Unit: mm

WW25M(0.001}), WW25N(0.001}~0.002})

Unit: mm

Symbol

2512

6.40±0.20

3.20±0.20

0.60±0.10

1.60±0.25

WW25Q, WW25R, WW12R, WW12D, WW06R

Note : 1. The detailed dimensions please refer to data sheet per type!

Symbol

2512

2010

1206

6.40±0.20

5.00±0.20

3.10±0.20

3.20±0.20

2.50±0.20

1.60±0.20

0.60±0.15

0.60±0.25

0.65±0.25

0.60±0.20

0.65±0.25

0.60±0.20

-55 ~ +155 C

Item

General Specification

Series No.

WW25R

WW25Q

WW12R

WW12D

WW08R

WW06R

Size code

2512 (6432)

1206(3216)

0805 (2012)

0603 (1608)

Resistance Tolerance

±5% , ±1%

Resistance Range

1,2,3,4,5,6

OSU$!=

1 ~ 15m=

20, 25, 30, 40,

50m=

20, 25, 30, 40

50m=

5, 10, 15m=

?&$!=

TCR (ppm/

)

±100ppm

±75ppm

Max. dissipation @ Tamb=70

2 W

1 W

1/2 W

1/3 W

Max. Operation Current (DC or RMS)

44.7A

14A

8.1A

Operation Temperature

-55 ~ +155 C

WW08D

1/2 W

11A

3, 5, 10, 12,

$&"!"&&!=

H&$!$&"!"&=

H=;*$!!^H;*O&

Chip Resistors

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Chip Resistors

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Chip Resistors Array : Convex Termination

Feature

Application

1. High reliability and stability

1. Consumer electrical equipment, PDA Digital Camcorder,

2. Reduced size of final equipment

2. EDP, Computer application

3. Lower assembly cost and higher surface mounted efficiency

3. Mobile phone, Telecom

4. Higher component and equipment reliability

4. DIMM

Description and Physical Dimensions

The resistors array is constructed in a high grade ceramic body (aluminum oxide). Internal metal
electrodes are added at each end and connected by a resistive paste that is applied to the top
surface of the substrate. The composition of the paste is adjusted to give the approximate
resistance required and the value is trimmed to within tolerance by laser cutting of this resistive
layer.
The resistive layer is covered with a protective coat. Finally, the two external end terminations are
added. For ease of soldering the outer layer of these end termination is Tin solder alloy. Marking
code description is depended on component size and tolerance. Following figure shown the
construction of a Chip-R array.

Physical Dimensions

Unit: mm

Type

WA06X

WA04X

WA06Y

WA04Y

3.20±0.10

2.00±0.10

1.60±0.10

1.00±0.10

1.60±0.10

1.00±0.10

1.50±0.10

1.00±0.10

0.50±0.10

0.45±0.10

0.50±0.10

0.35±0.10

0.80±0.10

0.50±0.05

1.00±0.10

0.65±0.10

0.60±0.10

0.40±0.10

0.60±0.10

0.34±0.10

0.30±0.10

0.20±0.10

0.30±0.15

0.20±0.15

0.40±0.10

0.30±0.05

0.30±0.20

0.25±0.10

0.30±0.15

0.25±0.17

Quick Reference Data

Series No.

WA06X

WA04X

WA06Y

WA04Y

Size

0603×4(1608×4)

0402×4(1005×4)

0603×2(1608×4)

0402×2(1005×2)

Termination construction

8P4R,Convex

4P2R,Convex

Resistance Tolerance

±5%, ±1% (E24 series)

Resistance Range

10=~1M=(E24 series), Jumper (0=)

TCR (ppm/

)

±200

ppm/

Max. dissipation @ Tamb=70

1/10 Watt

1/16 Watt

1/10 Watt

1/16 Watt

Max. Operation Voltage (DC or RMS)

50V

Max. Overload Voltage (DC or RMS)

100V

50V

100V

25V

50V

Operation Temperature

Basic Specification

JIS C5201-1 / IEC 60115-1

Circuit Mode: R1=R2(=R3=R4)

Note :
Power derating curve and detail specification please refer to specific data sheets.

-55 ~ +155 C

Chip Resistors

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Chip Resistors

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Chip Resistors Array : Concave Termination

Feature

Application

1. High reliability and stability

1. Consumer electrical equipment, PDA Digital Camcorder,

2. Reduced size of final equipment

2. EDP, Computer application

3. Lower assembly cost and higher surface mounted efficiency

3. Mobile phone, Telecom

4. Higher component and equipment reliability

4. DIMM

5. Strong body and terminations
6. Excellent performance in surface mounting assembly.

Description and Physical Dimensions

The resistor array is constructed in a high grade ceramic body (aluminum oxide).
Internal metal electrodes are added at each end and connected by a resistive
paste that is applied to the top surface of the substrate. The composition of the
paste is adjusted to give the approximate resistance required and the value is
trimmed to within tolerance by laser cutting of this resistive layer.
The resistive layer is covered with a protective coat. Finally, the two external end
terminations are added. For ease of soldering the outer layer of these end
termination is Tin solder alloy. Marking code description is depended on
component size and tolerance. Following figure shown the construction of a
Chip-R array.

Quick Reference Data

Item

General Specification

Series No.

WA06T

WA04T

WA04U

Size

0603×4 (1608×4)

0402×4 (1005×4)

0402×2 (1005×2)

Termination construction

Concave type

Resistance Tolerance

±5% , ±1% (E24 series)

Resistance Range

10=~1M=, Jumper (0=)

TCR (ppm/

)

± 200 ppm/

± 300 ppm/

Max. dissipation @ Tamb=70

1/10 W

1/16 W

Max. Operation Voltage (DC or RMS)

50V

25V

Max. Overload Voltage

100V

50V

Operation Temperature

Circuit Mode

3.20+0.20/-0.10mm

2.00±0.10mm

1.00±0.10mm

1.60+0.20/-0.10mm

1.00±0.10mm

0.60±0.20mm

0.45±0.10mm

0.30±0.10mm

0.80±0.10mm

0.50±0.05mm

0.60±0.15mm

0.35±0.05mm

0.35±0.10mm

0.35±0.15mm

0.20±0.15mm

0.25±0.15mm

0.50±0.15mm

0.25±0.05mm

0.35±0.10mm

0.50±0.15mm

0.25±0.15mm

Note :
1. Power derating curve and detail specification please refer to specific data sheets.
2. Max. Operation Voltage : So called RCWW (Rated Continuous Working Voltage) is determined by

RCWV =

Rater Power

Resistance Value or Max. RCWV listed above, whichever is lower.

-55 ~ +155 C

Chip Resistors

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Chip Resistors

Ϯʳ

Physical Dimensions:

Unit: mm

WA04P

1.00±0.10

1.00+0.10/-0

0.35±0.10

0.65±0.20

0.33±0.10

0.15±0.10

0.25±0.10

WA04P Chip Attenuator

Typical Application of Chip Attenuator

WA04

001

Size code

WA04: 0402

per element

Type code

P: convex,

type

attenuator

Attenuation Range

000 = 0dB

R05 = 0.5dB

001 = 1dB

R15 = 1,5dB

002 = 2dB
003 = 3dB
004 = 4dB
005 = 5dB
006 = 6dB
007 = 7dB
008 = 8dB
009 = 9dB

010 =10dB

011 = 11dB
012 = 12dB
013 = 13dB
014 = 14dB
015 = 15dB
016 = 16dB
017 = 17dB
018 = 18dB
019 = 19dB
020 = 20dB

Characteristic Impedance

X:50=

Attenuation Tolerance

A :

Γ̈́

0.1dB

B :

Γ̈́

0.3dB

C :

Γ̈́

0.4dB

D :

Γ̈́

0.8dB

E :

Γ̈́

1.0dB

F :

Γ̈́

1.5dB

G :

Γ̈́

2.0dB

H :

Γ̈́

2.5dB

P :

Termination

T=7'' reel taped

Packaging

L=Sn base

(lead free)

type Attenuator for VSWR improvement and output frequency level matching on VCO application.

Quick Reference Data

Item

General Specification

Series No.

WA04P

Size

0402×2 (1005×2)

Termination construction

Convex type

Attenuation Range

0dB, 0.5dB ~ 20dB

Attenuation Tolerance
0dB
0.5dB
1dB~ 5dB
6dB~ 10dB
11dB~ 13dB
14dB
15dB~ 16dB
17dB~ 19dB
20dB

0.1dB

0.3dB

0.4dB

0.8dB

1.0dB

1.5dB

2.0dB

2.5dB

Characteristic impedance

Rated power at Tamb=70

0.1 W / package

Limiting Voltage (DC)

50V

Frequency range (DC)

MAX. 3 GHz

VSWR (Voltage Standing Wave Ratio)

MAX. 1.2

Number of Resistors

3 resistors

Number of Terminals

4 terminals

Operation Temperature

-40 ~ 125 C

Chip Resistors

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Special Application Chip Resistors

Feature

1. Provided Automotive & Anti-sulfuration resistors (MR/SR series) for Auto & Anti-sulfuration application.
2. Provided Total Lead Free resistors (WR_R series) to fulfill RoHS environmental regulation.
3. Provided trimmable resistors (WKxxM series) for customer special tolerance requirement.
4. Provided high precision tolerance (WFxxH/ WFxxT/ WFxxU/ WFxxW) down to

0.05% and

TCR down to 10ppm/

for voltage sensing application.

5. High reliability and stability.
6. Reduced size of final equipment
7. Lower assembly costs.
8. Higher component and equipment reliability
9. Special resistance, tolerance are available upon customer's request.

MR/SR Series of Automotive & Anti-sulfuration Chip Resistor

Feature

Application

1. High reliability and stability ±1%.
2. Sulfuration resistant
3. Automotive grade AEC Q-200 compliant.
4. 100% CCD inspection.
5. RoHS compliant and lead free.

1. Automotive application.
2. Consumer electrical equipment.
3. EDP, Computer application.
4. Telecom Application.

Ϯʳ

*MR series can withstand H2S 3ppm×1000hrs.

*SR series can withstand H2S 1000ppm×720hrs.

WR_R Series of Total Lead Free Chip Resistors

Feature

1. High reliability and stability
2. Reduced size of final equipment
3. Lower assembly cost
4. Higher component and equipment reliability
5. RoHS compliant and total lead free

Ϯʳ

Quick Reference Data

Ϯʳ

Part No. Definition

code

rd ~

code

th ~

code

ϭϭ

ϭϭϭϭ

WTC

Type code

Size code

Functional code

Marking code

(Resistance)

Tolerance code

Packaging code

Termination code

For example:

1000

Size code

Resistance Range

1=~10M= (±1% , ±5%) ,Jumper

TCR (ppm/

)

±200

ppm*

Max. dissipation @ Tamb=70

Max. Operation Voltage (DC or RMS)

Operation Temperature

Remark: *Detail specification please refer to specific data sheets!

-55 ~ +155 C

1206(3216)

1/4 W

200V

WR12_R

1210(3225)

1/3 W

200V

WR10_R

0805(2012)

1/8 W

150V

WR08_R

0603(1608)

1/10 W

50V

WR06_R

0402(1005)

1/16 W

50V

WR04_R

0201(0603)

1/20 W

25V

WR02_R

-55 ~ +125 C

Series No.

Quick Reference Data

Remark: *Detail specification please refer to specific data sheets!

Series No.

Size code

Resistance Range

TCR (ppm/

)

Max. dissipation @ Tamb=70

Max. Operation Voltage

MR12X

1206(3126)

1/4 W

200V

MR08X

0805(2012)

1/8 W

150V

MR06X

0603(1608)

1/10 W

75V

MR04X

0402(1005)

1/16 W

50V

Operation Temperature

Series No.

Size code

Resistance Range

TCR (ppm/

)

Max. dissipation @ Tamb=70

Max. Operation Voltage

Operation Temperature

SR12X

1206(3126)

1/4 W

200V

SR08X

0805(2012)

1/8 W

150V

SR06X

0603(1608)

1/10 W

75V

SR04X

0402(1005)

1/16 W

50V

1=~10M= (±1% , ±5%) ,Jumper

±200

ppm*

-55 ~ +155 C

1=~10M= (±1% , ±5%) ,Jumper

±200

ppm*

-55 ~ +155 C

MR25X

2512(6432)

250V

1=~10M= (±1% , ±5%) ,Jumper

±200

ppm*

-55 ~ +155 C

MR20X

2010(5025)

1/2W

200V

MR18X

1218(3248)

200V

MR10X

1210(3225)

1/2W

200V

SR20X

2010(5025)

1/2 W

200V

SR25X

2512(6432)

250V

Chip Resistors

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Chip Resistors

WKxxM Series of Trimmable Chip Resistors

Feature

Application

1. High precision, reliability and stability
2. Miniature size down to 00603 (1608)

1. Automotive application.
2. Consumer electrical equipment.
3. EDP, Computer application.
4. Telecom Application.

Description

The resistive layer is covered with a transparent protective coat. Finally, the two external end
terminations are added. For ease of soldering the outer layer of these end termination is Tin (Pb
free) solder alloy.

Ϯʳ

Physical Dimensions

Unit: mm

Type

WK25M

WK20M

WK10M

WK12M

WK08M

WK06M

6.30±0.15

5.00±0.15

3.10±0.15

2.00±0.10

1.60±0.10

3.20±0.15

2.50±0.15

1.60±0.15

1.25±0.10

0.80+0.15/-0.10

0.55±0.15

0.55±0.10

0.45±0.10

0.60±0.20

0.50±0.25

0.40±0.20

0.30±0.10

0.60±0.20

0.50±0.25

0.40±0.20

0.30±0.10

Ϯʳ

Quick Reference Data

Series No.

WK25M

WK20M

WK10M

WK12M

WK08M

WK06M

Size code

2512 (6332)

2010 (5025)

1210(3225)

1206(3216)

0805(2012)

0603(1608)

Resistance Tolerance

0/-20%(Y) and 0/-30%(X) E24 series

Resistance Range

1= ~ 4.7M=

10= ~ 4.7M=

TCR (ppm/

)

10= ~ 4.7M=: ±200 ppm/

кʳ

1= ~ 9.1=:

- 200 ~ +500 ppm/

±200 ppm/

Max. dissipation @ Tamb=70

1 W

1/2 W

1/4 W

1/8 W

1/10 W

1/16 W

Max. Operation Voltage (DC or RMS)

200V

150V

50V

Operation Temperature

Basic Specification

JIS C 5201-1 / IEC 60115-1

WKxxV Series of High Voltage Chip Resistors

Feature

Application

1. Special material and design for high working voltage required
2. Compatible with flow and reflow soldering.
3. Suitable for lead free soldering.

1. Power supply.
2. Automotive industry.
3. Measurement instrument.
4. Back light inverter.
5. Medical or Military equipment

1. This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication 60115-8” .

2. Max. Operation Voltage : So called RCWW (Rated Continuous Working Voltage) is determined

by RCWV=

Rater Power

Resistance Value or Max. RCWV listed above, whichever is lower.

Ϯʳ

Physical Dimensions

-55 ~ +125 C

The resistors are constructed on a high grade ceramic body (aluminum oxide). Internal metal
electrodes are added at each end and connected by a resistive paste that is applied to the top
surface of the substrate. The composition of the paste is adjusted to give the approximate
resistance required.

Ϯʳ

Quick Reference Data

Note :

Series No.

Size code

Resistance Tolerance

Resistance Range

47= ~ 51M=

?Oj=#$Lj=

$j=#$Lj=

TCR (ppm/

)

± 200 ppm/

* detail refer to data sheet

Max. dissipation @ Tamb=70

Max. Operation Voltage (DC or RMS)

WK25V

2512 (6332)

1 W

800V

WK20V

2010 (5025)

1/2 W

500V

WK12V

1206(3216)

±5% ; ±1%

±5% ; ±10%

1/4 W

500V

WK08V

0805(2012)

1/8 W

400V

WK06V

0603(1608)

47= ~ 10M=

1/10 W

200V

Operation Temperature

-55 ~ +125 C

WK25N

2512 (6332)

1 W

2000V

WK20N

2010 (5025)

1/2W

1500V

Unit: mm

Symbol

WK25V

6.30±0.15

3.20±0.15

0.55±0.15

0.60±0.20

WK20V

5.00±0.15

2.50±0.15

0.55±0.15

0.60±0.20

WK25N

6.30±0.15

3.20±0.15

0.55±0.15

0.60±0.20

WK20N

5.00±0.15

2.50±0.15

0.55±0.15

0.50±0.20

0.60±0.20

WK12V

3.10±0.15

1.60±0.15

0.55±0.10

0.50±0.25

WK08V

2.00±0.10

1.25±0.10

0.55±0.10

0.40±0.20

WK06V

1.60±0.10

0.80+0.15/-0.10

0.45±0.10

0.30±0.10

Chip Resistors

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WFxxP Series of High Power Chip Resistors

Feature

Application

1. High power rating and compact size
2. High reliability and stability
3. Reduced size of final equipment
4. Lead free product is upon customer requested

1. Power supply
2. PDA
3. Digital meter
4. Computer
5. Automotives.

Ϯʳ

Quick Reference Data

Item

General Specification

Series No.

WF25P

WF20P

WF10P

WF12P

WF08P

WF06P

WF04P

Size code

2512(6432)

2010(5025)

1210(3225)

1206(3216)

0805(2012)

0603 (1608)

0402(1005)

Resistance Tolerance

±1% , ±5%

Resistance Range

0=, 1= ~ 1M=

TCR (ppm/

)

± 100

ppm/

Max. dissipation @ Tamb=70

1/2W

1/4W

1/8W

Max. Operation Voltage (DC or RMS)

300V

200V

150V

50V

Operation Temperature

Note :

1. This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication 60115-8”.

2. Max. Operation Voltage : So called RCWW (Rated Continuous Working Voltage) is determined by

RCWV=

Rater Power

Resistance Value or Max. RCWV listed above, whichever is lower.

3. 2W loading with total solder-pad and trace size of 300mm

4. 0

maximum resistance Rmax

15m

and rated current

4Amp

Ϯʳ

Physical Dimensions

Unit: mm

Symbol

WF25P

WF20P

WF10P

WF12P

WF08P

WF06P

WF04P

6.30±0.20

5.00±0.20

3.10±0.10

3.10±0.15

2.00±0.15

1.60±0.10

1.00±0.05

3.10±0.20

2.50±0.20

2.60±0.10

1.60±0.15

1.20±0.15

0.80±0.10

0.50±0.05

0.60±0.15

0.60±0.10

0.55±0.10

0.50±0.10

0.45±0.10

0.35±0.05

0.60±0.25

0.50±0.20

0.50±0.25

0.40±0.20

0.30±0.20

0.25±0.10

1.80±0.25

0.60±0.25

0.50±0.20

0.50±0.25

0.40±0.20

0.30±0.20

0.25±0.10

WKxxS Series of Anti-Surge Chip Resistors

Feature

Application

1. Power rating and compact size
2. High reliability and stability
3. Reduced size of final equipment
4. Surge protection

1. Power supply.
2. Measurement instrument.
3. Automotive industry.
4. Medical or Military equipment.

Ϯʳ

Quick Reference Data

Item

General Specification

Series No.

WK25S

WK20S

WK10S

WK12S

WK08S

Size code

2512(6432)

2010(5025)

1210(3225)

1206(3216)

0805(2012)

Resistance Tolerance

±5% ,±10% ,±20%,(E24)

Resistance Range

0.27= ~ 22M=

TCR (ppm/

)

± 200

ppm/

Max. dissipation @ Tamb=70

1 W

3/4W

1/2W

1/4W

1/8W

Max. Operation Voltage (DC or RMS)

200V

150V

Operation Temperature

Note :

1. This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication 60115-8” .

2. Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by

RCWV=

Rater Power

Resistance Value or Max. RCWV listed above, whichever is lower.

Ϯʳ

Physical Dimensions

Unit: mm

Symbol

WK25S

WK20S

WK10S

WK12S

WK08S

6.30±0.15

5.00±0.15

3.20±0.15

2.00±0.10

3.20±0.15

2.50±0.15

1.60±0.15

1.25±0.10

0.55±0.15

0.55±0.10

0.30±0.15

0.30±0.20

0.60±0.20

0.50±0.25

0.40±0.20

-55 ~ +155 C

Duration (msec)

)

Pulse chart of WKxxS series

2512
2010
1210
1206
0805

Duration (msec)

)

Pulse chart of WKxxS series

2512
2010
1210
1206
0805

Chip Resistors

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Chip Resistors

High Precision Chip Resistors

Narrow Tolerance Thick Film TC100 WFxxH Series

Series No.

WF12H

WF08H

WF06H

WF04H

)

(

)

(

)

(

)

(

S
Resistance Tolerance

±0.5% , ±0.1%

Resistance Range
TCR (ppm/ )

±100 ppm/

Max. dissipation @ Tamb=70

1/4 W

1/8 W

1/10 W

1/16 W

)

(

M
Operation Temperature
Basic Specification

JIS C5201-1 / IEC 60115-1

(Detail specification please refer to specific data sheets)

Narrow Tolerance Thin Film TC50 WFxxT/ WFxxQ Series

Series No.

WF25T WF25Q WF20T WF20Q WF10T WF10Q WF12T WF12Q WF08T WF08Q WF06T WF06Q WF04T

Size

2512

(6432)

2512

(6432)

2010

(5025)

2010

(5025)

1210

(3225)

1210

(3225)

1206

(3216)

1206

(3216)

0805

(2012)

0805

(2012)

0603

(1608)

0603

(1608)

0402

(1005)

10 ~

TCR (ppm/ )

±50 ppm/

Max. dissipation @ Tamb=70

3/4W

1/2W

3/4W

1/4W

2/5W

1/8W

1/4W

1/10W

1/8W

1/16W

1/10W

1/16W

Max. Operation Voltage (DC or RMS)

200V

100V

150V

50V

75V

25V

(Detail specification please refer to specific data sheets)

Narrow Tolerance Thin Film TC25 WFxxU/ WFxxR Series

Series No.

WF25U WF25R WF20U WF20R WF10U WF10R WF12U WF12R WF08U WF08R WF06U WF06R WF04U

Size

2512

(6432)

2512

(6432)

2010

(5025)

2010

(5025)

1210

(3225)

1210

(3225)

1206

(3216)

1206

(3216)

0805

(2012)

0805

(2012)

0603

(1608)

0603

(1608)

0402

(1005)

R
Resistance Range

10 ~

TCR (ppm/ )

±25 ppm/

Max. dissipation @ Tamb=70

3/4W

1/2W

3/4W

1/4W

2/5W

1/8W

1/4W

1/10W

1/8W

1/16W 1/10W

1/16W

Max. Operation Voltage (DC or RMS)

200V

100V

150V

50V

75V

50V

Operation Temperature

(Detail specification please refer to specific data sheets)

Narrow Tolerance Thin Film TC15 WFxxF Series

Series No.

WF12F

WF08F

WF06F

WF04F

)

(

)

(

)

(

)

(

S
Resistance Tolerance

±0.5%, ±0.1%, ±0.05%

TCR (ppm/ )

± 15 ppm/

Max. dissipation @ Tamb=70

1/8W

1/10W

1/16W

Max. Operation Voltage (DC or RMS)

150V

100V

50V

25V

Operation Temperature
Basic Specification

JIS C5201-1 / IEC 60115-1

(Detail specification please refer to specific data sheets) * Sample is available upon request

Operation Temperature

-55 ~ +155 C

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Test and Requirements

For WR Series

Requirements

Test

Procedure / Test Method

Resistor

Electrical Characteristics

JISC5201-1: 1998 Clause 4.8

- DC resistance values measurement

- Temperature Coefficient of Resistance (T.C.R)

Natural resistance change per change in degree centigrade.

[(R2-R1)

R1(T2-T1)]×10

(ppm /

) T1:20

-1

R1:Resistance at reference temperature (20

/-1

)

R2:Resistance at test temperature (-55

or +155

)

Within the specified tolerance Refer

to “QUICK REFERENCE DATA”

50m=

Resistance to soldering heat(R.S.H)

JISC5201-1:1998

Clause 4.18

Un-mounted chips completely immersed for 10±1second in a SAC

solder bath at 260

±5ºC

±5%:

R/Rmax. (1%+0.05=)

±1%:

R/Rmax. (0.5%+0.05=)

no visible damage

50m=

Solder ability

JISC5201-1:1998

Clause 4.17

Un-mounted chips completely immersed for 2±0.5 second in a SAC

solder bath at 235

±5

95% coverage min., good tinning and no visible

damage

Temperature cycling

JISC5201-1:1998

Clause 4.19

30minutes at -55

±3

, 2~3minutes at 20

-1

,30minutes at

+155

±3

,2~3minutes at 20

-1

,total 5continuous cycles

±5%:

R/Rmax. (1%+0.05=)

±1%:

R/Rmax. (0.5%+0.05=)

no visible damage

50m=

High Temperature Exposure

MIL-STD-202

Mothod 108

1000+48/-0 hours; without load in a temperature chamber controlled 155

±3

±5%:

R/Rmax. (2%+0.1=)

±1%:

R/Rmax. (1%+0.1=)

no visible damage

50m=

Bending strength

JISC5201-1:1998

Clause 4.33

Resistors mounted on a 90mm glass epoxy resin PCB(FR-4), bending

once 3mm for 10sec, 5mm for WR04

±5%:

R/Rmax. (1%+0.05=)

±1%:

R/Rmax. (1%+0.05=)

no visible damage

50m=

Adhesion

JISC5201-1:1998

Clause 4.32

Pressurizing force: 5N, Test time: 10±1sec.

No remarkable damage or removal of the

terminations

Short Time Overload (STOL)

JISC5201-1:1998

Clause 4.13

2.5 times RCWV or max. overload voltage, for 5seconds

±5%:

R/Rmax. (2%+0.1=)

±1%:

R/Rmax. (1%+0.1=)

no visible damage

50m=

Load life in Humidity

JISC5201-1:1998

Clause 4.24

1000+48/-0 hours, loaded with RCWV or Vmax in humidity chamber

controller 40

±2

at and 90~95% relative humidity, 1.5 hours on and

0.5 hours off

±5%:

R/Rmax. (2%+0.1=)

±1%:

R/Rmax. (1%+0.1=)

no visible damage

50m=

Load life (endurance)

JISC5201-1:1998

Clause 4.25

1000+48/-0 hours, loaded with RCWV or Vmax in chamber controller 70

±2

1.5 hours on and 0.5 hours off

±5%:

R/Rmax. (2%+0.1=)

±1%:

R/Rmax. (1%+0.1=)

no visible damage

50m=

Insulation Resistance

JISC5201-1:1998

Clause 4.6

Apply the maximum overload voltage (DC) for 1minute

10G=

Dielectric Withstand Voltage

JISC5201-1:1998

Clause 4.7

Apply the maximum overload voltage (AC) for 1minute

No breakdown or flashover

Chip Resistors

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Chip Resistors

For WW Series

Requirements

Test

Procedure / Test Method

Resistor

Electrical Characteristics

JISC5201-1: 1998 Clause 4.8

- DC resistance values measurement

- Temperature Coefficient of Resistance (T.C.R)

Natural resistance change per change in degree centigrade.

[(R2-R1)

R1(T2-T1)]×10

(ppm/

) T1:20

-1

R1:Resistance at referance temperature (20

/-1

)

R2:Resistance at test temperature (-55

or +155

)

Within the specified tolerance

Refer to “QUICK REFERENCE DATA”

Resistance to soldering heat(R.S.H)

JISC5201-1:1998

Clause 4.18

Un-mounted chips completely immersed for 10±1second in a SAC

solder bath at 260

±5ºC

R/R max. ±(1%+0.005=)

no visible damge

Solder ability

JISC5201-1:1998

Clause 4.17

Un-mounted chips completely immersed for 2±0.5 second in a SAC

solder bath at 235

±5

95% coverage min., good tinning and no visible

damage

Temperature cycling

JISC5201-1:1998

Clause 4.19

30minutes at -55

±3

, 2~3minutes at 20

-1

,30minutes at

+155

±3

,2~3minutes at 20

-1

,total 5continuous cycles

R/R max. ±(1%+0.005=)

no visible damge

High Temperature Exposure

MIL-STD-202

Method 108

1000+48/-0 hours; without load in a temperature chamber controlled

155

±3

R/R max. ±(3%+0.005=)

no visible damge

Bending strength

JISC5201-1:1998

Clause 4.33

Resistors mounted on a 90mm glass epoxy resin PCB(FR-4),

bending once 3mm for 10sec, 5mm for WR04

R/R max. ±(1%+0.005=)

no visible damge

Adhesion

JISC5201-1:1998

Clause 4.32

Pressurizing force: 5N, Test time: 10±1sec.

No remarkable damage or removal of the

terminations

Short Time Overload (STOL)

JISC5201-1:1998

Clause 4.13

2.5 times RCWV or max. overload voltage, for 5 seconds

R/R max. ±(2%+0.005=)

no visible damge

Load life in Humidity

JISC5201-1:1998

Clause 4.24

1000+48/-0 hours, loaded with RCWV or Vmax in humidity chamber

controller 40

±2

at and 90~95% relative humidity, 1.5 hours on

and 0.5 hours off

R/R max. ±(3%+0.005=)

no visible damge

Load life (endurance)

JISC5201-1:1998

Clause 4.25

1000+48/-0 hours, loaded with RCWV or Vmax in chamber controller

±2

1.5 hours on and 0.5 hours off

R/R max. ±(3%+0.005=)

no visible damge

Insulation Resistance

JISC5201-1:1998

Clause 4.6

Apply the maximum overload voltage (DC) for 1minute

10G=

Dielectric Withstand Voltage

JISC5201-1:1998

Clause 4.7

Apply the maximum overload voltage (AC) for 1minute

No breakdown or flashover

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Packing on Tape and Reel: All specifications are in accordance with IEC 60286-3 !

Paper Tape Specifications for WR,WF,WW Series and WA,WT Series

Unit: mm

Component Size / Series

8.00±0.30

3.50±0.20

WA06W

12.0±0.10

5.50±0.05

WR02X

8.00±0.20

3.50±0.05

1.75±0.10

4.00±0.10

1.50+0.1

Component Size / Series

1206(3216), WA06X, WA06T

3.60±0.20

2.00±0.20

0805(2012)

2.40±0.20

1.65±0.20

Max. 1.0

0603(1608)

1.90±0.20

1.10±0.20

4.00±0.10

0.65±0.05

0402(1005)

1.20±0.10

0.70±0.10

2.00±0.10

0.40±0.05

WA04X, WA04T

2.20±0.20

1.20±0.20

2.00±0.05

Max. 0.6

WA04Y, WA04P, WA04U

1.15±0.10

2.00±0.05

0.45±0.05

WT04X

3.45+0.2/-0

1.85+0.2/-0

4.00±0.10

0.85±0.05

WA06W

4.20+0.2/-0

1.80+0.2/-0

4.00±0.10

0.65±0.05

WR02X

0.67±0.05

0.37±0.05

2.00±0.05

0.45±0.05

1210(3225)

3.60±0.20

3.00±0.20

4.00±0.10

Max. 1.0

ˍġ

Plastic Tape Specifications for WR, WF, WW Series of Chip-R

Unit: mm

Component Size

2512(6432)

2010(5025)

1218(3248)

6.90±0.20

5.50±0.20

3.55±0.30

3.60±0.20

2.80±0.20

4.90±0.20

12.00±0.30

5.50±0.10

1.75±0.10

4.00±0.10

8.00±0.10

4.00±0.10

1.50+0.1

Max. 1.2

ˍġ

Plastic Tape Reel Specifications for WR, WF, WW Series of Chip-R

Unit: mm

Reel/Tape

7”reel for 8mm tape

9.00±0.50

7”reel for 12mm tape

178.0±0.20

60.0±1.00

13.0±0.20

12.4±1.00

10”reel for 8mm tape

254.0±2.00

100.0±1.00

13.0±0.20

9.00±0.50

10”reel for 12mm tape

254.0±2.00

100.0±1.00

13.0±0.20

14.0±0.20

13”reel for 8mm tape

330.0±2.00

100.0±1.00

13.0±0.20

9.00±0.50

ˍġ

Reel Taping Quantity Specifications for WR,WF,WW Series and WA,WT Series

Unit: mm

Component Size / Series

Q'ty per reel

Reel Diameter

0603, 0805, 1206

1,000 pcs

4” reel

1210, 1206, 0805, 0603, WA06X, WA06T, WT04X

5,000 pcs

7” reel

10,000 pcs

7” reel

0201, 0402

15,000 pcs

7” reel

WA06X, WA06Y

5,000 pcs

7” reel

2512, 2010

4,000 pcs

7” reel

1218

3,000 pcs

10” reel

1206, 0805, 0603, WA06X, WA06T

10,000 pcs

10” reel

2010, 2512

8,000 pcs

10” reel

13” reel

WA04X, WA04Y

40,000 pcs

13” reel

1206, 0805, 0603, WA06X,

20,000 pcs

13” reel

2010

0201

, 2512

16,000 pcs

13” reel

0201,0402, WA04X, WA04Y, WA04P, WA04T, WA04U

0201, 0402, WA04X, WA04Y

0402

1210, 1206, 0805, 0603, 0402,

WA06X, WA06T, WA04X, WA04Y,

WA04P, WA04T, WA04U, WT04X

H: 50,000 pcs/ G: 70,000 pcs

Q: 20,000 pcs/ J: 40,000 pcs

Chip Resistors

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Chip Resistors

Ϯʳ

Footprint Design for 10P8R Network Resistor :

Unit: mm

Symbol

WT04X

0.50±0.05

0.35±0.05

0.80±0.10

0.70±0.05

0.65±0.05

3.20±0.10

2.80 + 0.40 / -0.20

Footprint Design

Footprint Design for WRxx, WFxx, WWxx Series :

Unit: mm

Reflow Soldering

Size

Processing Remarks

Placement Accuracy

01005

0.58

0.18

0.20

0.10

0.90

0.40

±0.03

0201

0.75

0.30

0.20

1.10

0.50

±0.05

0402

1.50

0.50

0.60

0.10

1.90

1.00

±0.15

0603

2.10

0.90

0.60

0.90

0.50

2.35

1.45

±0.25

0805

2.60

1.20

0.70

1.30

0.75

2.85

1.90

±0.25

1206

3.80

2.00

0.90

1.60

4.05

2.25

±0.25

1210

3.80

2.00

0.90

2.80

1.60

4.05

3.15

±0.25

1.40

4.20

5.50

±0.25

3.40

5.85

3.15

±0.25

2512

7.00

3.80

1.60

3.50

3.40

7.25

3.85

IR or hot plate soldering

±0.25

Wave Soldering

Size

Processing Number & Dimensions

of dummy tracks

Placement Accuracy

0603

2.70

0.90

0.80

0.15

3.40

1.90

1× (0.15 × 0.80)

±0.25

0805

3.40

1.30

1.05

1.30

0.20

4.30

2.70

1× (0.20 × 1.30)

±0.25

1206

4.80

2.30

1.25

1.70

1.25

5.90

3.20

3× (0.2 5× 1.70)

±0.25

1210

4.80

2.30

1.25

2.50

1.25

5.90

3.60

3× (0.25 × 1.70)

±0.25

1218

4.80

2.30

1.25

4.80

1.30

5.90

5.60

3× (0.25 × 4.80)

±0.25

2010

6.30

3.50

1.40

2.50

3.00

7.00

3.60

3× (0.75 × 2.50)

±0.25

2512

8.50

4.50

2.00

3.20

3.00

9.00

4.30

3× (1.00 × 3.20)

±0.25

1218

3.80

2.00

0.90

4.80

2010

5.60

3.80

0.90

2.80

WA02A

WA02B

1.40± 0.05

0.80± 0.05

0.20 +0/ -0.05

0.30 +0/ -0.05

0.30± 0.05

0.4

0.5

0.9± 0.10

Chip Resistors

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3-5 sec

Fig

i . 1 Recommended IR reflow soldering profile for

. 1 Recommended IR reflow soldering profile for

1 R

d d IR

ld i

fil f

SMT process with SnAgCu series solder paste

Fig. 3 Recommended reflow soldering profile for SMT
process with eutectic SnPb solder paste.

Fig. 2 Recommended wave soldering profile for SMT

process with SnAgCu series solder

Fig. 4 Recommended soldering profile by manual with

SnAgCu series solder material

Storage and Handling Conditions:

To store products with following condition:

Temperature :5 to 40

Humidity : 20 to 70% relative humidity

Caution:
a.

Don't store products in a corrosive environment such as sulfide, chloride gas, or acid. It may cause oxidization of electrode,
which easily be resulted in poor soldering

To store products on the shelf and avoid exposure to moisture.

Don't expose products to excessive shock, vibration, direct sunlight and so on

Precaution of Soldering

It is recommended to use a mildly activated rosin flux
( less than 0.1% wt chlorine )

Excessive flux must be avoided

When water-soluble flux is used, enough washing is necessary

Two times limitations for reflow soldering is highly recommended

Recommendation of Soldering Profiles:

1. Products are recommended to be used up within two years since production as ensured shelf life . Check solderability in case shelf life
extension is needed.

Solder repair by soldering iron

Max. 350

for below 3 seconds is highly recommended

Do not directly contact termination to avoid thermal shock.

Prevent any external force on the products until solder is cooled

Mounting

Imperfect adjustment of mounting machine may cause the cracks, the chipping and the alignment error. Check and inspect the
mounting machine in advance.

Set the backup pins in proper layout otherwise the components mounted on the backside of the board are damaged. Do not set
these pins at the position of the nozzle.

Adjust the bottom dead point of dispenser away from the board when you apply adhesive.

Confirm that the products are corresponding to flow soldering when you perform it.

Pay attention to the amount of solder because improper amount of solder place large stress on the products and cause
cracks or malfunctions.

Washing

Confirm the ionic residues in solder do not remain after washing for moisture resistance and corrosion. Resistance may cause
deterioration when these substances are attached to the products.

Confirm the reliability in advance when using no washing solder, water or soluble agent.

Wash thoroughly after soldering to remove ionic substances like sweat and salinity.

The ultrasonic washing may destruct the products due to resonance by vibration. High hydraulic pressure may also damage the products.

Dry the products sufficiently after washing.

In general application, the lead free (Pb-free) termination CRs are used and may be mounted on PCB by IR reflow or wave soldering process with
lead-free solder material. The recommended soldering profiles are shown as Fig.1 & 2. The lead-free termination CRs are also suitable on SMT process
against lead-containing solder paste. But the soldering temperature should be higher than the melting point of solder paste 30

at least. If the optimized

solder joint is requested, increasing soldering time, temperature and concentration of N2 within oven are recommended. Advised IR reflow soldering
profile is shown as Fig.3.

Chip Resistors