BEL S558-5999-50

defining a degree of excellence
HIGH SPEED LAN MAGNETICS
960021A
• Tested and qualified for use with Quality
Semiconductor's QS6612 10/100Base-TX symbol
transceiver chipset
• Low profile, surface mount packaging, rated for 225ºC
peak IR reflow temperature
• Dual and quad multi-port magnetics modules available
• 350µH OCL (inductance) with 8mA DC bias applied
• 2000 Vrms isolation
ELECTRICALS AT 25ºC
Part No.
Insertion Loss
(dB) Typ
1MHz-100MHz
Return Loss
(dB) Min
1MHz-30MHz
Return Loss
(dB) Min
30MHz-60MHz
Return Loss
(dB) Min
60MHz-80MHz
Crosstalk
(dB) Min
1MHz-100MHz
-1.0
-1.0
-16
-16
16-20log(f/30MHz)
16-20log(f/30MHz)
-10
-10
-35
-35
S558-5999-50
S558-5999-54
Common to Diff
Mode Rej (dB) Min
30MHz 100MHz
-50
-50
-30
-30
Common to Common
Mode Rej (dB) Min
30MHz 100MHz
Schematic
-50
-50
-30
-30
B
A
SCHEMATICS
A
B
MECHANICAL
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
HIGH SPEED LAN MAGNETICS
960021A
APPLICATION CIRCUIT
APPLICATION NOTES
• These Bel part types have been designed for use in 100 Mbps or 10/100 Mbps data transmission systems over
category 5 UTP/STP cable. Each Bel part type provides superior EMI noise suppression, high voltage isolation,
wave shaping and fast, but controlled rise times. All parts meet IEEE 802.3 standards, which includes 350µH OCL
(inductance) when 8mA of DC bias is applied.
• These Bel part types have been tested and qualified for use with the Quality Semiconductor 6611 transceiver in
adapter card applications. No impedance matched common mode termination is recommended since proper
implementation of this type of circuit requires quiet grounding, not readily available in adapter card applications. Bel
also provides dual, 2-port (S558-5999-83) and quad, 4-port (S558-5999-77) designs for multi-port applications to
provide board space and cost efficiency with no performance degradation. These dual and quad devices can be
found on Bel data sheet 960009. Since the transmit turns ratio of the S558-5999-83 and -77 is 1.23:1 (due to the
specifications of the QSI 6612 chipset), implementation with the QSI 6611 is accomplished using slightly higher
current achieved by changing the 5 volt resistors from 100ý to 86ý and the IREF resistor from 4.75ý to 4.53ý.
• 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
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