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.
For use in 100Base-TX, 10/100Base-TX, ATM 155 or
100 Mbps TP-FDDI applications
Compatible with multiple PHY transceivers
Low profile, surface mount or through-hole packaging
available
Available with or without impedance matched common
mode termination on the transmit channel
960020A
A558-5999-01
350
2000
-1.0
-50
-40
-40
-30
-30
A
1
S558-5999-01
350
2000
-1.0
-50
-40
-40
-30
-30
A
2
S558-5999-30
350
2000
-1.0
-50
-40
-40
-30
-30
A
3
S558-5999-42
350
2000
-1.0
-50
-40
-40
-30
-30
A
4
S558-5999-90
350
2000
-1.0
-50
-40
-40
-30
-30
B
4
SCHEMATICS
A
B
HIGH SPEED LAN MAGNETICS
ELECTRICALS AT 25C
Inductance
Isolation
Insertion Loss
CMDR
CMCM
Crosstalk
OCL (H) Min
Vrms
(dB) Typ
(dB) Min
(dB) Min
(dB) Max
Package
Part No.
@8mA DC bias
Min
1MHz-100MHz
30MHz 100MHz
30MHz 100MHz
1MHz-100MHz
Schematic
Style
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.
960020A
HIGH SPEED LAN MAGNETICS
2
MECHANICALS
1
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.
MECHANICALS (CONT'D)
HIGH SPEED LAN MAGNETICS
960020A
3
4
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
APPLICATION CIRCUIT
APPLICATION NOTES
These Bel part types have been designed for use in 100 Mbps TP-FDDI, 100Base-TX, 10/100Base-TX and ATM
155 Mbps applications over Category 5 UTP or STP cable.
Each Bel part type is designed with high voltage isolation transformers and common mode chokes. The S558-
5999-90 also includes an impedance matched common mode termination. For background details concerning the
proper implementation or complete elimination of this termination circuit, please request Bel's separate application
note available on this subject. All designs have been created to provide 350H OCL with 8mA DC bias applied.
Consult the Bel short form catalog and recommended application circuit for the specific configuration of each
individual part type.
The surface mount packages are designed 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.
960020A
HIGH SPEED LAN MAGNETICS
PDF 
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