HIGH FREQUENCY MAGNETICS
T1/E1 Through Hole Transformers
•
Operates as a line-interface pulse transformer in DS1
and CEPT applications
Desiged for automatic machine placement into
printed wiring boards
Only difference between the 2745AJ and 2745AJ2 is
the terminal length
Only difference between the 2745CA and 2745CA2
is the terminal length
•
•
•
•
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
TM00121
•
•
•
ELECTRICAL SPECIFICATIONS at 25° C
Turns Ratio
± 2%
Part Number
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
0.92
0.92
0.8
0.8
0.7
0.7
DCR
Ω
max
Pri
0.50
0.50
0.85
0.85
Sec
1.00
1.00
1.2
1.2
N/A
N/A
20
20
850
850
1000
1000
___
___
2741H2
2741H2
Interwinding
Breakdown
Voltage
Vrms min
Primary
Inductance*
mH min
Leakage
Inductance
µ
H max
Interwinding
Capacitance
pFmax
Shielded
Version
* Measured at 10 kHz, 0.1 Vac
SCHEMATICS
Lucent IC
Part Number
Receive
Application
Bel Part Number
T7288
T7289A
T7290A
T1 / CEPT 75 / CEPT 120
DS1
T7630
CEPT 75.1
CEPT 75.2 / CEPT 120
CEPT 75.1
T7688
CEPT 75.2 / CEPT 120
T7689
DS1
DS1
T7690
T7698
CEPT 75.1
CEPT 75.2 / CEPT 120
2745CA2
2745G3
2745G3
2745AJ2
2745CA2
2745CA2
2745G3
2745G3
2745AF2
2745G3
2745AJ2
2745CA2
2745AJ2
2745CA2
2745G3
2745AJ2
2745CA2
2745AJ2
CEPT 75 / CEPT 120
DS1
DS1
2745AF2
2745AF2
2745AF2
Bel Part Number
2745CA2
2745G3
Transmit
2745AJ
2745AJ2
3
4
5
2745AJ2
1
Primary
6
Secondary
2745CA
2745CA2
3
4
2
1
6
Secondary
2745AJ2
2745CA2
Primary
©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
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HIGH FREQUENCY MAGNETICS
TM00121
T1/E1 Through Hole Transformers
MECHANICAL
2745AJ
2745CA
2745AJ2
2745CA2
0.56 (14.22)
MAX
0.56 (14.22)
MAX
0.46 (11.68)
MAX
0.46 (11.68)
MAX
TERMINAL 1
IDENTIFIER
0.35 (8.89)
MAX
0.35 (8.89)
MAX
TERMINAL 1
IDENTIFIER
0.155 (3.94)
0.150
(3.81)
1
0.250
(6.35)
6
5
4
2
3
0.023 (0.584) SQ TYP
(PHOSPHOR BRONZE,
SOLDER COATED)
0.110 (2.79)
±0.010 (0.25)
0.023 (0.584) SQ TYP
(PHOSPHOR BRONZE,
SOLDER COATED)
0.150
(3.81)
1
2
3
0.250
(6.35)
6
5
4
Unless otherwise specified, dimensions are nominal and in inches (millimeters).
©2000 Bel Fuse Inc. Specifications subject to change without notice. 09.00
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
T1-48
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