HIGH FREQUECY MAGNETICS
T1/E1 Surface Mount Transformers
TM00138
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Operates at the T1 rate of 1.544 Mbits/s and at the
E1 rate of 2.048 Mbits/s
Designed for transmit and receive line interface
applications
Low capacitance design with specific interwinding
insulation (2779L)
1500 Volt isolation
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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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ELECTRICAL SPECIFICATIONS AT 25° C
Nominal
Turns Ratio
±2%
(4-1):(5-8)
1
2779G
2779L
1 : 1.14 CT
1 : 1.14 CT
Inductance
2
mH min
(4-1)
1.80
1.25
(4-1)
1.2
0.9
DCR
Leakage
Inductance
3
µH max
(5-8)
1
1.4
0.5
(4-1)
1
1.3
1.8
Interwinding
Capacitance
1
pF
(4-1) & (5-8)
1
20 typ
10 max
Minimum
Interwinding
Breakdown
Voltage
Vrms
1500
1500
Ω
max
Part Number
1. connect 6 to 7
2. measured at 10 kHz, 0.1 Vac
3. measured at 100 kHz
SCHEMATIC
2779G
2779L
4
5
7
CT
6
1
1:N
8
©2000 Bel Fuse Inc. Specifications subject to change without notice. 09.00
Bel Fuse Inc.
198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
T1-85
BEL [ BEL FUSE INC. ]
