ETALDOC 752/6

Page 1 of 4

January 2001

PRODUCT DATA SHEET

HDSL Transformer

P3920

Features

Applications

∗

  Low Cost

∗

  Conexant HDSL

∗

  Low Distortion

∗

  SDSL

∗

  IEC 950, UL 1950 and EN 60950 Certified

∗

  UL Recognized Component

∗

  BABT Certified

∗

  Supplementary Insulation

∗

  Surface Mount

∗

  Industry Standard Footprint

∗

  Directly replaces 50430R and C1561

 

 
 

DESCRIPTION

P3920 is a low distortion transformer intended for
Conexant HDSL chipsets e.g. BT8921 and
BT8970.

P3920 is certified to safety standards IEC 950,
EN 60950 and UL 1950 for supplementary
insulation, 250V working voltage. P3920 is a UL
Recognized Component and is supported by an
IEC CB Test Certificate and BABT Certificate.

The safety system yields very low transformer
parasitics, ensuring that P3920 exhibits excellent
frequency response and balance; in combination
with its good harmonic distortion performance,
P3920 is ideally suited to low cost yet demanding
HDSL applications.

E203175

to Electronic Techniques

(Anglia) Limited

P3920

ETALDOC 752/6

Page 2 of 4

January 2001

SPECIFICATIONS

Electrical

Typical values at T = 25ºC, unless otherwise stated.

Parameter

Conditions

Min

Typ

Max

Units

Inductance

10kHz 100mV
1-5 (link 2-4)

1.8

2.0

2.2

mH

Leakage inductance

100kHz, 100mV, 1-5
(link 2-4; link 7-9)

-

-

12

µH

DC resistance

1-4; 2-5; 7-9

-

-

0.8

Ù

Turns ratio

1-5 : 9-7 ( link 2-4)

1.98

2.00

2.02

-

Frequency response 

(1)

30kHz – 300kHz

-

-

±0.2

dB

Longitudinal balance 

(1)

20kHz – 300kHz

50

-

-

dB

Total Harmonic

Distortion 

(1)

20kHz 2Vrms
1-5 (link 2-4)

-

-

-80

dB

Voltage isolation 

(2)

50Hz
DC
(1, 2, 4, 5 : 7, 9)

2.12

3.0

-
-

-
-

kVrms

kV

Operating range:
Functional
Storage

Ambient temperature

-40
-40

-
-

+85
+85

ºC
ºC

 

Notes

1.  135Ù line, 32Ù equipment.
2.  Components are 100% tested at 3.25kV DC.

P3920

ETALDOC 752/6

Page 3 of 4

January 2001

CONSTRUCTION

Dimensions shown are in millimetres (inches).

SAFETY

ABSOLUTE MAXIMUM RATINGS

(Ratings of components independent of circuit).

Short term isolation voltage (1s)

2.12kVrms,
3.0kVDC

Storage temperature

-40ºC to
+85ºC

Constructed in accordance with IEC 950:1991,
supplementary insulation, 250V maximum working
voltage, flammability class V-0.

Installation requirements should be observed
whereby a minimum of 1.0mm  creepage and
1.5mm clearance is maintained between the ferrite
core and accessible conductive parts in the host
equipment.

Reflow temperature (10s)

260ºC

0.80
(0.032)

0

.7

0

(0

.0

2

8

)

15.40

(0.606)

2

,5

0

(0

.0

9

8

)

Connections

Fig. 2

17.15 max

(0.67)

1

2.

9

 m

a

x

(0

.5

1)

12

.2

 m

a

x

(0

.4

8

)

13.0
(0.51)

0

.7

(0

.0

3

)

2,

5

(0

.1

0

)

CHAMFER
ON BOBBIN

Dimensions

Fig. 1

N

C

/0

00

0

70

P3920

ETALDOC 752/6

Page 4 of 4

January 2001

CERTIFICATION

COPYRIGHT

Certified by BSI to IEC 950:1991/A4:1996 (IEC CB
Test Certificate No.  GB518W) sub-clauses 1.5,
1.5.1, 1.5.3, 2.2, 2.2.2, 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 +85ºC in
Pollution Degree 2 environments, supplementary
insulation, clearance greater than 2.0mm,
creepage greater than 2.5mm, distance through
solid insulation greater than 0.4mm.

Certification covers Appendix ZB national
deviations for Sweden and Norway.

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 250Vrms, Pollution Degree
2, supplementary insulation.

UL File number E203175.
Certified by BABT to EN 60950.
BABT Certificate NC/000070.

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 P3920 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.

© 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

ISO 9001

FM 25326