HIGH FREQUENCY MAGNETICS
T1/E1 Through Hole Transformers
TM00121
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Operates as a line-interface pulse transformer in DS1
and CEPT applications
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Operating temperature range: -40° C to +85° C
Meets IEC 695, 2-2 flammability requirements
Desiged for automatic machine placement into
printed wiring boards
PWB Process Capability: standard printed wiring board
assembly techniques, total-immersion cleaning
Only difference between the 2745AJ and 2745AJ2 is
the terminal length
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Reliability testing: Shock, vibration, temperature cycling,
temperature - humidity - bias
Only difference between the 2745CA and 2745CA2
is the terminal length
ELECTRICAL SPECIFICATIONS at 25° C
DCR
Ω
max
Turns Ratio
Interwinding
Breakdown
Voltage
Primary
Inductance*
mH min
Leakage
Inductance
µH max
Interwinding
Capacitance
pFmax
± 2%
Shielded
Version
Part Number
Vrms min
Pri : Sec
Pri
Sec
2745AJ
2745AJ2
2745CA
2745CA2
1 : 1.07 CT
1 : 1.07 CT
1 : 1.36 CT
1 : 1.36 CT
1.0
1.0
0.8
0.8
0.7
0.7
0.50
0.50
0.85
0.85
1.00
1.00
1.2
N/A
N/A
20
850
850
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___
0.92
0.92
1000
1000
2741H2
2741H2
1.2
20
* Measured at 10 kHz, 0.1 Vac
SCHEMATICS
Receive
Transmit
Lucent IC
Part Number
Application
2745AJ
Bel Part Number
2745AF2
2745AF2
2745AF2
2745AF2
2745G3
Bel Part Number
2745CA2
2745G3
2745AJ2
3
4
T7288
CEPT 75 / CEPT 120
DS1
T7289A
5
6
DS1
2745AJ2
2745CA2
2745G3
T7290A
T7630
T1 / CEPT 75 / CEPT 120
DS1
1
Primary
Secondary
CEPT 75.1
2745AJ2
2745CA2
2745AJ2
2745CA2
2745G3
2745AJ2
2745CA2
2745AJ2
2745CA2
2745G3
2745CA
2745CA2
CEPT 75.2 / CEPT 120
CEPT 75.1
T7688
T7689
3
1
4
2
CEPT 75.2 / CEPT 120
DS1
DS1
2745G3
2745G3
6
T7690
T7698
CEPT 75.1
2745AJ2
2745CA2
2745AJ2
2745CA2
Primary
Secondary
CEPT 75.2 / CEPT 120
©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
T1-47
