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.
S553-3873-17
-0.8
150
-20
-40
4
A
S556-5999-30
-0.5
180
-20
-40
4
B
MECHANICAL
SCHEMATICS
Designed for use with National Semiconductor's RIC2A
and LERIC 8 (DP83959) multi-port PHY transceivers
Robust miniature SMT packaging, rated to 225C peak
IR reflow temperature
Low cost dual 2-port design solution
2000 Vrms isolation
S556-5999-30 includes inductors for use with additional
differential filtering
10BASE-T NETWORK COMPONENTS
A
B
ELECTRICALS AT 25C
Insertion Loss
OCL
Return Loss
Crosstalk
Rise
(dB) Max
(Inductance)
(dB) Min
(dB) Min
Time
Part No.
1MHz-30MHz
H Min
5MHz-10MHz
100kHz-30MHz
nsec Max
Schematic
960012B
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
960012B
APPLICATION NOTES
APPLICATION CIRCUIT
10BASE-T NETWORK COMPONENTS
Bel has designed these parts for use with National Semiconductor's 10Base-T transceivers, which include digital
filtering in the silicon. All Bel part types contain high voltage isolation transformers. The Bel S556-5999-30 also
contains inductor cores, when used with the recommended externally placed discrete elements, create a differential
filter design sometimes necessary to reduce the effect of unwanted noise and to fully comply with IEEE 802.3
standards. Contact the local Bel sales office for a separate application note for implementation characteristics for the
S556-5999-30. Common mode chokes are not inclusive to the design of these parts. With good layout and proper
grounding techniques, the use of common mode chokes may be eliminated. For information on recommended PCB
layouts, please contact Bel engineering. If necessary, separately packaged common mode chokes are available on
data sheet 960046A.
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.
S556-5999-30
S553-3873-17
PDF 
ZIP