HIGH FREQUENCY MAGNETICS
T1/E1 Through Hole Shielded Transformers
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•
Designed for DS1, DS1C, and CEPT applications
Electrostatic shield provides improved longitudinal
signal suppression and EMI reduction
Maximum inductance unbalance of center-tapped
windings is 0.1%
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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
TM00123
ELECTRICAL SPECIFICATIONS at 25° C
Turns Ratio
± 2%
DCR
Ω
max
Pri
4.5
4.5
3.15
3.15
0.92
0.92
0.92
0.92
4.5
4.5
6.5
6.5
1.1
1.1
2.5
2.5
3.7
3.7
1.9
1.9
0.75
0.75
0.83
0.83
Sec
7.2
7.2
4.4
4.4
1.05
1.05
1.43
1.43
10
10
5
4
5
4
10
10
5
4
5
4
Minimum
Interwinding
Breakdown
Voltage
Vrms
1000
1000
850
850
1000
1000
850
850
Part Number
1
Primary
Inductance
2
mH min
Leakage
Inductance
µ
H max
Interwinding
Capacitance
3
pF max
Non-Shielded
Version
Pri : Sec
2741B
2741B2
2741G
2741G2
2741C
2741C2
2741H
2741H2
1CT : 2CT
1CT : 2CT
1CT : 2CT
1CT : 2CT
1 : 1.36CT
1 : 1.36CT
1 : 1.37CT
1 : 1.37CT
2745AF2
2745AF2
2745AF2
2745AF2
2745CA2
2745CA2
2745CA2
2745CA2
1. A "2" suffix indicates short terminals (see mechanical section)
2. measured at 10 kHz, 0.1 Vac
3. with terminal 1 grounded
4. There is an internal connection to terminal 8; do not use
2741C
2741C2
2741H
2741H2
SCHEMATICS
2741B
2741B2
2741G
2741G2
S
2
3
S
4
3
2
1
Primary
Secondary
5
6
7
6
CT
4
7
Primary
1
5
Secondary
©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
T1-51
BEL [ BEL FUSE INC. ]
