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

• Bel has developed a variety of quad, 4-port part types for use with National Semiconductor's product line of quad, 4-

port PHY transceivers that incorporate digital filtering techniques within the silicon itself. Bel's "filterless magnetics" are

optimized for this specific application and create a very cost efficient design solution. Each Bel part type contains

transmit and receive transformers to provide for wave shaping, high voltage isolation and EMI noise suppression.

• Bel has designed these parts as a family of parts with common footprint and pinouts to enable the designer to customize

the use of common mode choke for optimum system performance.

• In multi-port system applications, good PCB layout and proper grounding techniques are very critical to achieve FCC

class A and B equipment approvals. Bel recommendations are available and can be provided by contacting our

engineering department or your local sales representative.

• 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.

APPLICATION NOTES

APPLICATION CIRCUIT

10BASE-TNETWORKCOMPONENTS

QUAD4-PORTMODULES

960072A