ETALDOC 751/4

Page 1 of 4

January 2001

PRODUCT DATA SHEET

LOW COST, LOW DISTORTION 

P3311

LINE MATCHING TRANSFORMER

Features

Applications

∗

  Low Cost

∗

  V.90 and V.92 Modems

∗

  Low Distortion

∗

  V.34 Modems

∗

  12.6mm (0.5”) Seated Height

∗

  Industry Standard Pinout

∗

  IEC 950, UL 1950 and EN 60950 Certified

∗

  UL Recognized Component

∗

  BABT Certificate of Recognition

∗

  Extended Frequency Response

∗

  Flat TX and RX Responses

∗

  High Thermal Stability

∗

  Directly replaces 2811B and ATS-273

 

 

DESCRIPTION

P3311 is intended for V.90 and V.92 (56kbps)
modems and other high-speed applications where
ultra-low distortion at moderate power levels and
very low voiceband frequencies is required at a
most competitive price.

P3311 is offered as a direct replacement for 2811B
and ATS-273 in existing circuits without changes to
matching components.

P3311 exhibits stable core characteristics over its
operating temperature range to maximize data
throughput under varying environmental conditions
without the need for modem retraining.

P3311 uses patented design and construction
methods to achieve excellent signal performance
and safety isolation to international standards at
truly low cost.   P3311 is certified to EN 60950,
IEC 950, UL1950 and EN 41003. P3311 is a UL
Recognized Component and is supported by a
BABT Certificate of Recognition and an IEC CB
Test Certificate.

FOR NEW DESIGNS

 P3356 IS RECOMMENDED

Patented

E203175

to Electronic Techniques

(Anglia) Limited

P3311

ETALDOC 751/4

Page 2 of 4

January 2001

SPECIFICATIONS

Electrical

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

Parameter

Conditions

Min

Typ

Max

Units

Insertion Loss

f = 2kHz, R

L

 = 600

Ω

-

-

2.0

dB

Frequency Response

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

-
-
-

10
30

-

-
-

±

0.1

Hz

kHz

dB

Return Loss

200Hz – 4kHz

20

-

-

dB

Third Harmonic
Distortion

(1)

150Hz -3dBm in line

-

-

-78

dBm

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)

, R

DC

Sum of windings

227

-

270

Ω

Leakage inductance, 

∆

L

4.3

-

7.2

mH

Shunt inductance

(4)

, Lp

200Hz   10mV

9

-

-

H

Shunt loss

(4)

, Rp

200Hz   10mV

18

-

-

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 –20dBm, Lp will

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

Patented

Equivalent Circuit

Fig. 1

IDEAL

1:1

½   L

½   L

½R

½R

P3311

ETALDOC 751/4

Page 3 of 4

January 2001

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 7g.

Patented

Connections

µ

2 2   F

600    Reference Circuit

Ω

Fig. 2

LINE

600

360

TXA2

TXA1

Dimensions

P3311

ETALDOC 751/4

Page 4 of 4

January 2001

SAFETY

ABSOLUTE MAXIMUM RATINGS

(Ratings of components independent of circuit).

Constructed in accordance with IEC 950:1991,
EN 60950:1992 (BS7002:1992), supplementary
insulation, 250Vrms maximum working voltage,
flammability class V-0.

There are no special installation requirements
(beyond attending to usual PCB track separations)
since the integral cover provides supplementary
insulation from its external faces to internal core
and windings.

Short term isolation voltage (1s)

DC current
Storage temperature

Lead temperature, 10s

2.12kVrms,
3.0 kVDC
100

µ

A

-40ºC to
+85ºC
260ºC

CERTIFICATION

COPYRIGHT

Certified under the IEC CB scheme (Certificate
GB445W) to IEC 950:1991, up to amendment 4, sub-
clauses 1.5, 1.5.1, 1.5.3, 2.2, 2.2.3, 2.2.4, 2.9.2, 2.9.3,
2.9.4, 4.4, 4.4.3.2 (class V-0) and 5.3  for a maximum
working voltage of 250Vrms, nominal mains supply
voltage not exceeding 300Vrms and a maximum
operating temperature of 70ºC in Pollution Degree
2 environments.

Recognized under the Component Recognition
Program of Underwriters Laboratories Inc. to US and
Canadian requirements CAN/CSA C22.2
No. 950-95/UL1950, Third Edition, including revisions
through to revision date March 1, 1998, based on
Fourth Amendment of IEC 950, Second Edition,
maximum working voltage 180Vrms (creepage), 420V
peak (clearance), Pollution Degree 2, supplementary
insulation.

UL File number E203175.
Approved and certified by BABT to EN 60950 and
EN 41003.
BABT Certificate of Recognition 608755

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.

ETAL and P3311 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.

P3311 design and construction are protected by
patents and registered design.
British Patent No. 2333646.
British Patent No. 2340667.
UK Registered Design No. 2077360.
French Registered Design No. 991512.
Germany Registered Design 49902311.0.
United States Registered Design 426, 815.
Other patents and registered designs pending.

© 1998 - 2000 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

Websites: www.etal.ltd.uk

www.profec.com

Email:

info@etal.ltd.uk

sales@profec.com

Patented

ISO 9001

FM 25326