ETALDOC 776/4

Page 1 of 5

January 2004

PRODUCT DATA SHEET 

LOW DISTORTION 

P5056

LINE MATCHING TRANSFORMER

Features

Applications

∗

 Lead-free (Pb-free)

∗

  V.90 and V.92 Modems

∗

 Low Distortion

∗

 V.34 Modems

∗

  11mm (0.43”) Seated Height

∗

 Fax Machines

∗

 Industry Standard Pinout

∗

 Instrumentation

∗

  IEC 60950 and UL 60950 Certified

∗

  Set Top Box/Web browsing

∗

  UL Recognized Component

∗

  Internet Feature Phones

∗

  Extended Frequency Response

∗

  Flat TX and RX Responses

∗

 Simple Matching

∗

 Low Insertion Loss

∗

  High Thermal Stability

 
 

 

DESCRIPTION

P5056 is intended for low cost V.90 and V.92
(56kbps) modems and other high-speed
applications where low distortion at moderate
power levels and very low voiceband frequencies is
required.

P5056 uses patented design and construction
methods to achieve excellent signal performance
and safety isolation to international standards. The
part is completely lead-free and suitable for
lead-free and conventional processing.

P5056 has exceptionally flat frequency response
from 30Hz to 10kHz, a 3dB bandwidth of 60kHz
and requires only the very simplest of matching to
achieve good return loss and transhybrid loss
across the voiceband, with very low levels of signal
distortion at signal frequencies as low as 150Hz.

P5056 also exhibits stable characteristics over its
full operating temperature range to maximize
data throughput under varying environmental
conditions without the need for modem
retraining.

P5056 is certified to IEC 60950 and UL 60950.
P5056 is a UL Recognized Component and is
supported by an IEC CB certificate.

Patented

P5056

ETALDOC 776/4

Page 2 of 5

January 2004

SPECIFICATIONS

Electrical

At T = 25ºC and as circuit Fig. 2 unless otherwise stated.

Parameter

Conditions

Min

Typ

Max

Units

Insertion Loss

f = 2kHz, R

L

 = 600

Ω

-

1.6

-

dB

Frequency Response

LF -3dB cutoff
HF -3dB cutoff
100Hz – 4kHz

-
-
-

10
60

-

-
-

±

0.1

Hz

kHz

dB

Return Loss

(5)

200Hz – 4kHz

20

-

-

dB

Transhybrid Loss

(5)

200Hz – 4kHz

-

20

-

dB

Third Harmonic
Distortion

(1)

150Hz -3dBm in line
200Hz -10dBm in line

-
-

-68
-89

-
-

dBm
dBm

Balance

DC – 5kHz
Method TG 25

80

-

-

dB

Voltage Isolation

(2)

50Hz
DC

2.12

3.0

-
-

-
-

kVrms

kV

Operating Range:
Functional
Storage

0

-40

-
-

+70
+85

ºC
ºC

Lumped equivalent circuit parameters as Fig. 1

DC resistance 

(3)

Primary resistance R

DCp

Secondary resistance R

DCs

92
88

-
-

114
108

Ω

Ω

Leakage inductance, 

∆

L

2.5

3.5

4.5

mH

Shunt inductance, Lp

(4)

200Hz 10mV

6

9

-

H

Shunt loss, Rp

200Hz 10mV

12

15

-

k

Ω

Notes:

1. Third harmonic typically exceeds other

harmonics by 10dB.

2.  Components are 100% tested at 3.25kVDC.
3.  Caution:   do not pass DC through windings.

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

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.  Return loss and transhybrid loss can be

improved to 30dB in improved matching circuit.
The values shown relate to the simplest
configuration, Fig. 2.

Equivalent Circuit

Fig. 1

IDEAL

1:1

½   L

½   L

P5056

ETALDOC 776/4

Page 3 of 5

January 2004

MATCHING RECOMMENDATIONS

The following recommendations start with the simplest implementations and progress to enhanced
performance utilizing an additional component.   Good performance is achieved even with the simplest
configurations.  The implementations assume a low impedance balanced TX drive and a relatively high
impedance RX input, as is commonly available, though use with other TX/RX arrangements is
straightforward.   Note that there are no changes to components on the line side, or in the hybrid, whether
600

Ω

 or complex reference impedance selected, thus assisting country configuration. For complex

impedance, the matching circuits derived are suitable for reference impedances of the type 270 + 750//150nF
e.g. European CTR21 and 220 + 820//120nF (or 115nF) e.g. Australia, South Africa, etc., and yield similar
performance characteristics.   For other impedances, please contact Profec Technologies.

Minimum Cost Implementations

Improved matching

Patented

LINE

270

(220)

750

(820)

150nF

(120nF)

910

100nF*

*Note:  100nF capacitor should have a temperature stable dielectric

82

European CTR21/(Australia, etc.)

Fig. 3

RXA

TXA2

TXA1

µ

22 F

600

Ω

Fig. 4

LINE

600

10nF

510

RXA

TXA2

TXA1

µ

22 F

10nF

LINE

270

(220)

750

(820)

µ

22 F

150nF

(120nF)

820

100nF*

*Note:  100nF capacitor should have a temperature stable dielectric

82

European CTR21/(Australia, etc.)

Fig. 5

RXA

TXA2

TXA1

600

Ω

Fig. 2

LINE

600

510

RXA

TXA2

TXA1

µ

22 F

P5056

ETALDOC 776/4

Page 4 of 5

January 2004

SAFETY

CERTIFICATION

Constructed in accordance with IEC 60950-1,

EN 

60950-1 and UL 60950, supplementary

insulation for a primary circuit, 250Vrms maximum

working voltage, flammability class V-1.

Certified under the IEC CB scheme (Certificate

GB597W) to IEC 60950 Third Edition 1999 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,

2.10.5.2, 2.10.5.4, 4.7, 4.7.3, 4.7.3.1, 4.7.3.4,

(Flammability Class V-1) ,5.2, 5.2.1, and 5.2.2 for

a maximum working voltage of 250Vrms, nominal

mains supply voltage not exceeding 300Vrms

and a maximum operating temperature of +85ºC

in Pollution Degree 2 environment,

supplementary insulation for a primary circuit.

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,

supplementary insulation.

UL File number E203175.

Additionally, Profec Technologies certifies all

transformers as providing voltage isolation of

2.12kVrms, 3kV DC minimum.  All shipments are

supported by a certificate of conformity to current

applicable safety standards.

CONSTRUCTION

Dimensions shown are in millimetres (inches).

Geometric centres of outline and pin grid coincide within a tolerance circle of 0.6mmØ.

Windings may be used interchangeably as primary or secondary.

Total weight typically 5.1g.

Patented

Connections

Dimensions

Fig 1

IDENT

Pin Ø

0.70mm (0.028) max

Finish:  SnAg over Ni barrier

NOTES:

Dimension “A” : 3.0 to 3.5mm (0.118 - 0.138)

P5056

ETALDOC 776/4

Page 5 of 5

January 2004

ABSOLUTE MAXIMUM RATINGS

INTELLECTUAL PROPERTY RIGHTS

(Ratings of components independent of circuit).

Short term isolation voltage (1s)

DC current
Storage temperature

Lead temperature, 10s

2.12kVrms,
3.0 kVDC
100

µ

A

-40ºC to
+85ºC
260ºC

ETAL and P5056 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.

P5056 design and construction are protected by

patents.

British Patent No. 2333646.

British Patent No. 2340667.

US Patent No. 6,344,787

European Patent No. 1082734

Singapore Patent No. 77763

Australia Patent No. 756952

Other patents pending.

© 1998 - 2004 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