S558-5999-B2 Просмотр технического описания (PDF) - Bel Fuse Inc.

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S558-5999-B2

HIGH SPEED LAN MAGNETICS

Bel Fuse Inc. 

defining a degree of excellence

960008A

APPLICATION NOTES

HIGH SPEED LAN MAGNETICS

• Bel has designed these part types for use in either 100 Mbps or 10/100 Mbps multi-port applications, where the PHY

device requires 1:1 transmit and receive isolation transformer ratios. Please refer to the Bel short form catalog for

recommendations of mating semiconductors. These quad, 4-port devices provide high isolation transformers, signal

wave shaping, fast but controlled rise times, EMI and common mode noise suppression. All part types meet IEEE

802.3 standards, which includes a requirement for 350µH OCL (inductance) at 8mA DC bias applied. Use of these Bel

part types provides optimum space and cost per port efficiency with no sacrifice in performance versus similar single

port devices.

• The S558-5999-B2 was specifically designed for use with stacked RJ-45 connectors. The S558-5999-B2 performs

the necessary trace crossovers internal to the magnetics module, which are normally found directly on the user's PC

board. This unique crossover magnetics design approach has no performance degradation versus the straight

through approach, allows for elimination of layers and via holes on the user's PC board, and may enhance noise

suppression.

• Refer to Bel's application note on the background and proper use of the impedance matched common mode

termination, which can be eliminated with use of the parts listed in this data sheet.

• 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

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