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
960014A
S553-5999-28
-1.0
50
200
-16
-40
-40
-35
-30
A
S553-5999-31
-1.0
50
200
-16
-40
-40
-35
-30
B
S553-5999-78
-1.0
50
200
-16
-40
-40
-35
-30
C
S553-5999-79
-1.0
50
200
-16
-40
N/A
N/A
N/A
D
Designed for use with National Semiconductor's
DP83959 10Base-T PHY transceiver, which
incorporates digital filtering in the silicon
Family of quad, 4-port designs utilizing common
footprints and pinouts, offering choice of common
mode choke topologies
A
10BASE-T NETWORK COMPONENTS
QUAD 4-PORT MODULES
Low profile, surface mount packaging, rated to 225C
peak IR reflow temperature
Cost and space efficient design solution
2000 Vrms isolation
B
ELECTRICALS AT 25C
Insertion Loss
OCL (Inductance)
Return Loss
Crosstalk
CM-CM Rej
(dB) Max
(H) Min
(dB) Min
(dB) Min
(dB) Min
Part No.
1-10MHz
TX RX
5MHz-10MHz
100kHz-30MHz
5-10MHz 10-30MHz 30-100MHz
Schematic
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.
MECHANICAL
C
D
SCHEMATICS (CONT'D)
960014A
10BASE-T NETWORK COMPONENTS
QUAD 4-PORT MODULES
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.
APPLICATION CIRCUIT
10BASE-T NETWORK COMPONENTS
QUAD 4-PORT MODULES
960014A
Please refer to National Semiconductor's
Application Note for detailed circuit 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
960014A
APPLICATION NOTES
10BASE-T NETWORK COMPONENTS
QUAD 4-PORT MODULES
Bel has developed a variety of quad, 4-port part types for use with National Semiconductor's product line of 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
transmit and receive transformers to provide for signal 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.
The pinout of these devices is most commonly used in applications with double-decker or "stacked" RJ-45
connectors.
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.
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