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pulseelectronics.com

ISDN S-Interface Low Profile

Dual SMT Transformers

T613.E (04/12)

Application Notes

Common Mode Chokes

For More Information

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Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product names mentioned herein may be

trademarks or registered trademarks of their respective owners. © Copyright, 2012. Pulse Electronics, Inc. All rights reserved.

IC

Manufacturer

IC

Part Number

Dual

Surface Mount

TX & RX

MC145474/145475

MC145574

Motorola

T5008NL

Packaging Information

Type

SMT

Part Weight

7 grams

Parts/Tube

20

Parts/Tray*

50

Parts/Reel*

200

Reel Diameter

13 inches

Tape Width

44 mm

Pitch

24 mm

Notes: Standard packaging for the transformer is

anti-static tubes. Optional Tape & Reel packaging

can be ordered by adding a “T” suffix to the end

of the part number, (i.e. T5008NLT).

1. General Information - The S-interface is the standardized

four-wire digital telephone access point defined by the

CCITT I-series recommendations for the Integrated

Services Digital Network. This “basic rate succes”

accommodates two 64 kBps “B-channels” for more

information, one 16Kbps “D-channel” intended for

signaling and control, and 48Kbps for framing and other

purposes, giving a total rate of 192Kbps. The CCITT

physical layer recommends that the user network

interface be transformer coupled.

The transformer provides isolation for the line card or the

terminal from the line. It is also a way to provide phantom

power feeding to the terminal over the S-loop. Each end

requires a transmit and a receive transformer. Chokes are

used in some applications to reduce common mode

noise.

Transformers described in this data sheet are matched to

the transceivers offered by the IC manufacturers listed.

2. Safety Standards Recognition - All transformers listed in

this data sheet are recognized to UL 1459 and UL 1950 as

a basic insulation barrier.

3. Flammability - Materials used in the products are

recognized UL94-VO. Products meet the requiremens of

IEC 695-2-2 (needle flame test).

4. For more application notes please refer to data sheet

T604.

Refer to data sheet G002 for selection of low and high frequency common mode chokes.