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 NOTES

APPLICATION CIRCUIT

• These Bel part types have been uniquely designed for either 100 Mbps or 10/100 Mbps data transmission systems

over category 5 UTP/STP cable. These Bel parts have been tested and qualified for use with the National

Semiconductor DP83223 TP-Transceiver and DP83840 10/100 Mbps PHY device. Each Bel module 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.

• This Bel unique design approach allows for separation of the 10 Mbps and 100 Mbps signals, creating better signal

balance, superior noise suppression, optimization of performance for each 10 Mbps and 100 Mbps signal and ease

of magnetics design. The approach also allows for the addition of either a 10 Mbps or 100 Mbps common mode

choke, which could not be effectively implemented if the 10 Mbps and 100 Mbps shared the same signal lines.

• 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.

960029A

HIGHSPEEDLANMAGNETICS