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defining a degree of excellence  
HIGHSPEEDLANMAGNETICS  
960033A  
• Designed for use with either Seeq 80C240 or Cypress  
Semiconductor CY7C971 100Base-T4 transceivers  
• Low profile, surface mount packaging, rated to 225ºC  
peak IR reflow temperature  
• Complies with IEEE 802.3 standards  
• 2000 Vrms isolation  
• Multiple design options, no CMC, integrated CMC or  
separately packaged CMC  
ELECTRICALS AT 25°C  
Sec Inductance  
Leakage  
Coupling  
Pri/Sec  
Turns  
Ratio  
(UTP side) OCL Inductance Capacitance (ohms)  
Package  
Schematic Style  
Part No.  
(µH) Min  
LL (µH) Max CWW (pF) Max Max  
S553-5999-46  
S553-5999-49  
S555-1204-00*  
S558-5999-C5  
1:2CT;1:2CT;1:2CT;1:2CT  
1:2CT;1:2CT;1:2CT;1:2CT  
1:1;1:1;1:1;1:1  
350  
350  
40 (primary)  
350  
0.25  
0.25  
N/A  
12  
12  
N/A  
1.0  
0.3/1.0  
0.3/1.0  
N/A  
B
C
D
A
1
1
2
1
2CT:1;2CT:1;2CT:1;2CT:1  
0.25  
0.3/1.0  
*common mode choke  
SCHEMATICS  
A
B
C
D
Specifications subject to change without notice.  
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  
defining a degree of excellence  
HIGHSPEEDLANMAGNETICS  
960033A  
MECHANICALS  
1
2
Specifications subject to change without notice.  
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  
defining a degree of excellence  
HIGHSPEEDLANMAGNETICS  
960033A  
APPLICATION CIRCUITS  
Specifications subject to change without notice.  
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  
defining a degree of excellence  
HIGHSPEEDLANMAGNETICS  
960033A  
APPLICATION CIRCUITS (CONT'D)  
APPLICATION NOTES  
• These parts have been developed for use with multiple IC transceivers for 100Base-T4 category 3, 4, or 5 UTP cable  
applications. There are multiple design options available for optimization of the specific application.  
• 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.  
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  
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  
San Po Kong  
Kowloon, Hong Kong  
Tel: 852-2328-5515  
Fax: 852-2352-3706