defining a degree of excellence
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
Specifications subject to change without notice.
SCHEMATICS
960070A
MECHANICAL
S553-2940-04
-1.0
100
-18
-40
-40
-30
A
S553-2940-10
-1.0
100
-18
-40
-40
-30
B
S553-2940-11
-1.0
100
-18
-40
N/A
N/A
C
Designed for use with Level One LXT914/918/944 or
Texas Instruments' Quad PHY TNETE 2004 10Base-T
transceiver chipsets
Quad, 4-port design offers optimal space, performance
and cost efficiency
10BASE-T NETWORK COMPONENTS
Family of designs offered with common footprint and
pinout to accommodate customized EMI requirements
Low profile surface mount packages, rated to 225C
peak IR reflow temperature
2000 Vrms isolation
A
B
C
ELECTRICALS AT 25C
Insertion Loss
OCL
Return Loss
Crosstalk
CM-CM Rej
(dB) Max
Inductance
(dB) Min
(dB) Min
(dB) Min
Part No.
1-10MHz
(H) Min
1MHz-10MHz
1MHz-10MHz
10-30MHz 100MHz
Schematic
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
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.
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.
These designs have been optimized for board layouts using stackable or "double decker" RJ-45 connectors in order
to keep traces short and straight.
960070A
10BASE-T NETWORK COMPONENTS
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