ETALDOC 110/10

Page 1 of 4

February 2006

PRODUCT DATA SHEET

PICK-OFF TRANSFORMER

P1727

Features

Applications

∗

  12.6mm (0.5") seated height

∗

 Telecommunications

∗

 Lead-free (Pb-free)

∗

 Pick-off applications

∗

 RoHS compliant

∗

  Calling Line Identification

∗

 Vacuum encapsulated

∗

 Instrumentation

∗

  IEC 60950 and UL 60950 certified

∗

 Voice Recording

∗

  UL Recognized Component

 

 

DESCRIPTION

P1727 is a high impedance transformer for
applications where high performance and safety
isolation to international standards are required in a
compact case size.

P1727 has a turns ratio of 2.162:1 giving an
impedance transformation of 4.67:1.

P1727 is designed for “listening” applications when
placed across a line, presenting a very high
impedance to minimize circuit loading.

P1727 is certified to IEC 60950 and UL 60950.
P1727 is a UL Recognized Component and is
supported by an IEC CB Test Certificate. The
part is completely lead-free, compliant with RoHS
Directive 2002/95/EC, and suitable for lead-free
and conventional processing.

 

P1727

ETALDOC 110/10

Page 2 of 4

February 2006

SPECIFICATIONS

Electrical

At T = 25ºC unless otherwise stated.

Parameter

Conditions

Min

Typ

Max

Units

Voltage
isolation 

(1)

50Hz
DC

3.88

5.5

-
-

-
-

kVrms

kV

Balance

DC – 5kHz
Method TG25

50

-

-

dB

Input impedance

200Hz – 4kHz, Fig 2

12

-

-

k

Ω

Operating range:
Functional
Storage
Humidity

Ambient temperature

-25
-40

-

-
-
-

+85

+125

95

ºC
ºC

%R.H.

Lumped equivalent circuit parameters as Fig. 1

DC resistance, R

DC

 

(2)

Sum of windings
(Corrected for ratio)

-

-

1537

Ω

Leakage inductance 

∆

L

Refered to pins 1-3

-

-

160

mH

Shunt inductance Lp

10mV  200Hz

22

-

-

H

Shunt loss Rp

10mV  200Hz

50

-

-

k

Ω

 

Notes

1.  Components are 100% tested at 6.5kV DC.
2.  Caution:  do not pass DC through windings.

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

P1727

ETALDOC 110/10

Page 3 of 4

February 2006

CONSTRUCTION

   

Dimensions shown are in millimetres (inches).
Geometric centres of outline and pin grid coincide within a tolerance circle of 0.6mm

Equivalent Circuit

LINE

Fig 1

Recommended Circuit

Fig 2

Through "loss" (including voltage ratio) 6.7dB plus less than 0.8dB 

excluding effect of any DC blocking capacitor.

Response:   ±0.3dB  200Hz - 4kHz

e

2

P1727

ETALDOC 110/10

Page 4 of 4

February 2006

SAFETY

CERTIFICATION

Constructed in accordance with IEC 60950-1:2001,
EN 60950-1:2001 and UL 60950-1 First Edition,
supplementary insulation, 250Vrms maximum
working voltage, flammability class V-0.
Distances through solid insulation 0.4mm
minimum.

Certified under the IEC 

CB scheme (Certificate

DK-9431) to IEC 

60950-1:2001, sub-clauses 1.5,

1.5.1, 1.5.2, 1.7, 1.7.1, 2, 2.9, 2.9.1, 2.9.2, 2.9.3,
2.10, 2.10.1, 2.10.2, 2.10.3, 2.10.3.1, 2.10.3.3,
2.10.4, 2.10.5, 2.10.5.1, 2.10.5.4, 4, 4.7, 4.7.1, 4.7.3,
4.7.3.1, 4.7.3.4, 5, 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 environments, supplementary
insulation, including national differences for
Denmark, Finland, Germany, Norway, Sweden,
Switzerland, USA, Canada and UK.
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.

ABSOLUTE MAXIMUM RATINGS

COPYRIGHT

(Ratings of components independent of circuit).

Short term isolation voltage (15s)

DC current

Storage temperature

Lead temperature, 10s

4.6kVrms,
6.5kV DC

100

µ

A

-40ºC to
+125ºC

260ºC

ETAL and P1727 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.

© 1996 – 2006 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