defining a degree of excellence
Bel Fuse Inc.
198 Van Vorst Street, Jersey City, NJ 07302 Tel: 201-432-0463 Fax: 201-432-9542 E-Mail: Belfuse@belfuse.com
Website: http://www.belfuse.com
Specifications subject to change without notice.
S556-2006-32
-0.6
-1.0
-1.8
-10
-16
-9
-30
-30
-20
-50
-50
-45
MECHANICAL
SCHEMATIC
960015A
Designed to meet ATM 25.6 PHY specifications
including low frequency cutoff parameter. Can also be
used in Token Ring Switch applications.
Compatible with Texas Instruments (380C30/C60), IDT
(77105) and Transwitch (ALI-25T) PHY transceivers
For use with either 150 ohm (STP) or 100 ohm (UTP)
cable
Low profile, surface mount packaging rated to 225C
peak IR reflow temperature
ELECTRICALS AT 25C
Insertion Loss
Return Loss
Common to Common
Crosstalk
(dB) Max
(dB) Min
Mode Rej (dB) Min
(dB) Min
Part No.
4MHz 16MHz 24MHz 36MHz
1MHz-17MHz 17MHz-25MHz
5MHz 20MHz 200MHz
5MHz 16MHz 24MHz
ATM 25.6 MBPS FILTER MODULE
defining a degree of excellence
Corporate Office
Bel Fuse Inc.
198 Van Vorst Street, Jersey City, NJ 07302-4496
Tel: 201-432-0463
Fax: 201-432-9542
E-Mail: Belfuse@belfuse.com
Internet: http://www.belfuse.com
Far East Office
Bel Fuse Ltd.
8F/8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel: 852-2328-5515
Fax: 852-2352-3706
European Office
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Preston PR1 8UD
Lancashire, U.K.
Tel: 44-1772-556601
Fax: 44-1772-888366
960015A
APPLICATION NOTES
APPLICATION CIRCUIT
The S556-2006-32 can also be used in Token Ring switch applications where the transmit and receive channels can
be swapped. For this reason, filtering is implemented on both channels and after the transformer.
The Bel S556-2006-32 is designed for use with a variety of ATM 25.6 PHY transceivers, such as Texas Instruments
380C30 and C60, IDT 77105 and Transwitch ALI-25T. This Bel design incorporates both transmit and receive
filtering, impedance matching and EMI common mode noise suppression. The S556-2006-32 impedance matching
network allows for utilization in either 100 ohm UTP or 150 ohm STP cable systems.
Bel's low profile, surface mount packaging is ideal for high speed pick and place machinery. Parts can be shipped on
tape and reel for high speed placement. Construction processes have been implemented for thermal compatibility
with high temperature IR reflow assembly processing. Post dipping of leads assist with PC board solderability. Each
part is optically inspected to meet rigid coplanarity requirements.
Bel's design may also be used in certain 4/16 Mbps Token Ring applications. Consult factory for further information.
ATM 25.6 MBPS FILTER MODULE
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