defining a degree of excellence
10BASE-T NETWORK COMPONENTS
960073A
• Designed for use with Seeq 84C24 and 8425
10Base-T PHY transceivers
• Quad, 4-port designs for maximum space, performance
and cost efficiency
• Family of part types with same footprint and pinout to
customize EMI suppression requirements
• Low profile surface mount packaging, IR reflow rating of
225ºC peak temperature
• 2000 Vrms isolation
ELECTRICALS AT 25ºC
Part No.
Insertion Loss
(dB) Max
1-10MHz
OCL
Inductance
(µH) Min
Return Loss
(dB) Min
1MHz-10MHz
Crosstalk
(dB) Min
1MHz-10MHz
CM-CM Rej
(dB) Min
10-30MHz 100MHz
Schematic
S553-5841-02
S553-5841-20
S553-5841-21
-1.0
-1.0
-1.0
100
100
100
-18
-18
-18
-40
-40
-40
-40
-40
--
-30
-30
--
A
B
C
SCHEMATICS
A
B
C
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
10BASE-T NETWORK COMPONENTS
960073A
APPLICATION CIRCUIT
APPLICATION NOTES
• Bel has developed a variety of quad, 4-port part types for use with Seeq quad, 4-port PHY devices 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.
• 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.
• Optimized for use with stackable or "double decker" RJ-45 connectors in order to keep trace lengths 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
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
Embedded System
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