ETALDOC 459/9

Page 1 of 4

December 2003

PRODUCT DATA SHEET

MICROPROFILE LINE

P3081

MATCHING TRANSFORMER

Features

Applications

∗

 Surface Mount

∗

 Telecommunications

∗

 Lead-free (Pb-free)

∗

 V.34 modems

∗

 Low distortion

∗

 Portable computers

∗

  7mm seated height

∗

 Fax/Modems

∗

 Vacuum encapsulated

∗

  IEC 60950 and UL 60950 certified

∗

  UL Recognized Component

 
 

 

DESCRIPTION

P3081 is a low distortion microprofile transformer for
applications where high performance and safety
isolation to international standards are required in an
extremely small case size.

Designed specifically as a surface mount device, the
P3081 features a 7mm seated height and is offered
in the same package as the now familiar P2781 The
part is completely lead-free and suitable for lead-
free and conventional placement and reflow.

Despite the subminiature size, the performance is
superior to that of much larger components.  The
P3081 offers reinforced insulation, is ideal data
communications at high data rates, whilst capable of
being matched to both 600

Ω

 and complex

impedance telephone lines.

At moderate transmit power levels (e.g. -10dBm)
performance to 33,600 bits/second may be
achieved.

P3081 is certified to IEC 60950 and UL 60950.
P3081 is a UL Recognized Component, and is
supported by an IEC CB Test Certificate.

P3081

ETALDOC 459/9

Page 2 of 4

December 2003

SPECIFICATIONS

Electrical

At T = 25ºC and as circuit Fig. 1 unless otherwise stated.

Parameter

Conditions

Min

Typ

Max

Units

Insertion Loss

f = 2kHz

-

-

6

dB

Frequency response

-3dB LF cutoff

-3dB HF cutoff

200Hz - 4kHz

-

-

-

50

30

-

-

-

±0.2

Hz

kHz

dB

Return Loss

200Hz - 4kHz

16

-

-

dB

Third Harmonic
Distortion 

(1)

600Hz – 10dBm in line

-

-96

-

dBm

Balance

DC - 5kHz

Method TG25

80

-

-

dB

Saturation

Excitation 50Hz

250Vrms

Output voltage

across line

-

-

-

-

10

65

Vrms

Vpeak

Voltage
Isolation 

(2)

50Hz

DC

3.88

5.5

-

-

kVrms

kV

Operating range:

Functional
Storage

(5)

Humidity

Ambient temperature

-25

-40

-

-

-

-

+85

+125

95

ºC

ºC

%R.H.

Lumped equivalent circuit parameters as Fig. 1

DC resistance, R

DC

(3)

Sum of windings

-

300

-

Ω

Leakage

inductance 

∆

L

-

7

-

mH

Shunt

inductance Lp

(4)

10mV 1kHz

-

5

-

H

Shunt loss Rp

(4)

10mV 200Hz

--

15

-

k

Ω

Notes

1. Third harmonic typically exceeds other

harmonics by 20dB.

2.  Components 100% tested at 6.5 kVDC.
3. 

Caution:

 do not pass DC through windings.

Telephone line current, etc. must be diverted
using choke or semiconductor line hold circuit.

4.  At signal levels greater than 100mV, Lp will

increase and Rp will decrease slightly but the
effect is usually favourable to the return loss
characteristic.

5.  Excludes shipping materials.   Components are

dry-packed and sealed as shipped Handle in
accordance with IPC/JEDEC J-STD-033A
procedure for components classified as
IPC/JEDEC J-STD-020B Level 5a.

Equivalent Circuit

IDEAL

1:1

Fig 1

P3081

ETALDOC 459/9

Page 3 of 4

December 2003

PERFORMANCE

In practice, the 600

Ω

 load resistor will connect to a low output impedance TX driver. The 150nF capacitor

should appear in parallel with the 680

Ω

 load resistor (rather than in parallel with transformer winding) to obtain

optimum TX flatness to line.

CONSTRUCTION

Dimensions shown are in millimetres (inches).
Geometric centres of outline and pad grid coincide within a tolerance circle of 0.3mm

Ø.

Windings may be used interchangeably as primary or secondary.

Recommended Circuit

Fig 2

330

LINE

600

10nF

µ

6.8 F

600    MATCH

Ω

EUROPEAN CTR21 COMPLEX MATCH

Recommended Circuit

Fig 3

680

LINE

270

750

150nF

33nF

150nF

µ

2.2 F

2.54 2.54

13.0 max

(0.51)

9.0 max

(0.36)

7.0 max

(0.28)

(0.1) (0.1)

NOTE:

Dimensions shown are in millimetres (inches)

Dimensions

Fig 4

(0.06)

1.5

1.32

1.77

(0.052)

(0.07)

Tolerance 0.3mm

Terminals electroplated pure tin (Sn) 5 m minimum

Terminal size : 1.5 (0.06) long, 1.32 (0.05) wide

±

µ

Connections

Fig  5

1
2

3

4

5

6

P3081

ETALDOC 459/9

Page 4 of 4

December 2003

SAFETY

CERTIFICATION

Manufactured from materials conforming to
flammability requirements of UL94V-0.
Distance through reinforced insulation 0.4mm
minimum.
Creepage and clearances in circuit are 7mm
minimum where PCB pads do not exceed 3mmØ.
Construction complies with IEC 

60950-1,

EN 60950-1 and UL 60950-1, reinforced insulation,
250Vrms maximum working voltage.

ABSOLUTE MAXIMUM RATINGS

(Ratings of components independent of circuit).

Short term isolation voltage (2s)

4.6 kVrms,
6.5kVDC

DC current

100

µ

A

Storage temperature

-40ºC to
+125ºC

Soldering temperature
Profile peak – either

or
or

260ºC

10s

250ºC

30s

240ºC

60s

Certified by BSI to IEC 60950 Third Edition
(1999) (IEC CB Test Certificate No. GB592W)
sub-clauses 1.5, 1.5.1, 1.5.2, 2.9, 2.9.1, 2.9.2,
2.9.3, 2.9.4, 2.9.5, 2.10, 2.10.1, 2.10.2, 2.10.3,
2.10.3.1, 2.10.3.2, 2.10.4, 2.10.5, 2.10.5.1,
2.10.7, 2.10.8, 4.7, 4.7.3, 4.7.3.1, 4.7.3.4,
(Flammability Class V-0) ,5.2, 5.2.1, and 5.2.2
for a maximum working voltage of 250Vrms,
nominal mains supply voltage not exceeding
250Vrms and a maximum operating temperature
of +85ºC in Pollution Degree 2 environment,
reinforced insulation.

Recognized under the Component Recognition
Program of Underwriters Laboratories Inc. to US and
Canadian requirements CAN/CSA C22.2
No. 60950-1-03/UL60950-1,  First  Edition,  based  on
IEC 

60950-1, First Edition, maximum working

voltage 250Vrms, Pollution Degree 2, reinforced
insulation.

UL File number E203175.

Additionally, Profec Technologies certifies all
transformers as providing voltage isolation of
3.88kVrms, 5.5kV DC minimum.   All shipments
are supported by a Certificate of Conformity to
current applicable safety standards..

ORDERING CODE

COPYRIGHT

P3081

ÿÿ

TR = Tape and Reel
(Blank) = Bulk in tubes.

Carrier tape width 24mm,
600 parts per 13” reel.

ETAL P3081 and P2781 are Trade Marks of
Profec Technologies Ltd.
The Trade Mark ETAL is registered at the UK
Trade Marks Registry.
Profec Technologies Ltd. is the owner of the
design right under the Copyright Designs and
Patents Act 1988 and no rights or licences are
hereby granted or implied to any third party.

© 1997 - 2003  Profec Technologies Ltd.
Reproduction prohibited.

T R A N S F O R M I N G    T H E    F U T U R E

Profec Technologies Ltd., 10 Betts Avenue, Martlesham Heath, Ipswich, IP5 3RH, England

                           Telephone: +44 (0) 1473 611422

Fax:  +44 (0) 1473 611919

Website: www.profec.com 

Email:  info@profec.co.uk  sales@profec.com

FM 25326

ISO 9001

E203175