Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2000 Bel Fuse Inc. Specifications subject to change without notice. 09.00
TM00135
T1-79
ELECTRICAL SPECIFICATIONS AT 25 C
SCHEMATIC
Operates at the T1 rate of 1.544 Mb/s and the E1 rate
of 2.048 Mb/s
Provides two ratios to handle both 75
and 120
lines
Minimum Interwinding Breakdown Voltage of 1500
Vrms
HIGH FREQUENCY MAGNETICS
T1/E1 Dual Ratio Surface Mount Transformer
2771H
Operating temperature range: -40 C to +85
C
Meets IEC 695, 2-2 flammability requirements
PWB Process Capability: standard printed wiring board
assembly techniques, total-immersion cleaning
Reliability testing: Shock, vibration, temperature cycling,
temperature - humidity - bias
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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
2000 Bel Fuse Inc. Specifications subject to change without notice. 09.00
TM00135
T1-80
MECHANICAL
2771H
HIGH FREQUENCY MAGNETICS
T1/E1 Dual Ratio Surface Mount Transformer
0.590
(14.99)
MAX
0.120 (3.05)
0.160 (11.68)
0.495
(12.57)
MAX
0.430
(10.92)
MAX
TERMINAL 1
IDENTIFIER
0.395
(10.03)
MAX
0.23 (0.58) X 0.100 (2.54) FOOT
(PHOSPHOR BRONZE,
SOLDER COATED)
1 2 3 4
8 7 6 5
0.004
8 EDGES
0.100 (2.54) TYP
0.255
(6.48)
COMPONENT CENTER
0.008 (0.203)
2 PLACES
0.045
(1.14)
TYP
RECOMMENDED PCB PATTERN
0.120 (3.05) TYP
Unless otherwise specified, dimensions are nominal and in inches (millimeters).
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