defining a degree of excellence
10BASE-TNETWORKCOMPONENTS
960070A
APPLICATION CIRCUIT
APPLICATION NOTES
• Bel has developed a variety of quad, 4-port part types for use with Level One and Texas Instrument 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 4 channels of
transmit and receive transformers to provide for wave shaping, high voltage isolation and EMI noise suppression.
• Belhasdesignedthesepartsasafamilyofpartswithcommonfootprintandpinoutstoenablethedesignertocustomize
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.
• These designs have been optimized for board layouts using stackable or "double decker" RJ-45 connectors in order
to keep traces short and straight.
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
