Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
MODEM MAGNETICS
2000 Bel Fuse Inc. Specifications subject to change without notice. 05.00
TM00408
T4-17
V.90 Modem Transformers
2802A
2802B
SCHEMATIC
1
3
6
4
Primary
Secondary
Provide isolation and balance while minimizing signal
distortion and insertion loss in high-speed modem
applications
Qualified per Bellcore TR-TSY-000357-1
Approved by UL and CSA
2802A transformer is designed to match a 600
line to a
536
load
2802B transformer is designed to match a 600
line to a
301
load
Minimum interwinding breakdown voltage of 1000 Vrms
ELECTRICAL SPECIFICATIONS at 25 C
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CORPORATE
Bel Fuse Inc.
198 Van Vorst Street
Jersey City, NJ 07302
Tel
201-432-0463
Fax
201-432-9542
www.belfuse.com
FAR EAST
Bel Fuse Ltd.
8F / 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel
852-2328-5515
Fax 852-2352-3706
www.belfuse.com
EUROPE
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel
44-1772-556601
Fax 44-1772-888366
www.belfuse.com
MODEM MAGNETICS
2000 Bel Fuse Inc. Specifications subject to change without notice. 05.00
TM00408
T4-18
V.90 Modem Transformers
MECHANICAL
0.470
[11.94]
max
0.450
[11.43]
0.110
[2.79]
0.025 [0.63] Square
Phosphor Bronze
Solder-coated
0.650
[16.51]
max
0.750
[19.05]
0.550
[13.97]
4
6
3
1
Terminal 1
Identifier
Note: Unless otherwise specified, dimensions
are nominal and in inches [millimeters].
145
4.3 mH
150
6
4
20 pF
40 H
20 pF
3
1
150 k
TYPICAL SPICE TRANSMISSION MODEL
2802B
2802A
2802B
1.1 mH
42
4
6
20 pF
12 H
20 pF
3
1
40 k
44
2802A
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