BEL 2745CA

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
•
•
TM00121
•
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
Only difference between the 2745CA and 2745CA2
is the terminal length
ELECTRICAL SPECIFICATIONS at 25° C
Turns Ratio
± 2%
Part Number
Primary
Inductance*
mH min
DCR
Ω
max
Leakage
Inductance
µH max
Pri : Sec
Pri
Sec
Interwinding
Capacitance
pFmax
Interwinding
Breakdown
Voltage
Vrms min
Shielded
Version
2745AJ
1 : 1.07 CT
1.0
0.8
0.50
1.00
N/A
850
___
2745AJ2
1 : 1.07 CT
1.0
0.8
0.50
1.00
N/A
850
___
2745CA
1 : 1.36 CT
0.92
0.7
0.85
1.2
20
1000
2741H2
2745CA2
1 : 1.36 CT
0.92
0.7
0.85
1.2
20
1000
2741H2
* Measured at 10 kHz, 0.1 Vac
SCHEMATICS
Lucent IC
Part Number
Receive
Transmit
Bel Part Number
Bel Part Number
Application
2745AJ
2745AJ2
3
4
T7288
CEPT 75 / CEPT 120
2745AF2
2745CA2
T7289A
DS1
2745AF2
2745G3
DS1
2745AF2
2745AJ2
T1 / CEPT 75 / CEPT 120
2745AF2
2745CA2
1
6
DS1
2745G3
2745G3
Primary
Secondary
CEPT 75.1
2745AJ2
2745AJ2
CEPT 75.2 / CEPT 120
2745CA2
2745CA2
CEPT 75.1
2745AJ2
2745AJ2
CEPT 75.2 / CEPT 120
2745CA2
2745CA2
DS1
2745G3
2745G3
DS1
2745G3
2745G3
CEPT 75.1
2745AJ2
2745AJ2
CEPT 75.2 / CEPT 120
2745CA2
2745CA2
5
T7290A
T7630
T7688
T7689
T7690
T7698
2745CA
2745CA2
3
4
2
1
6
Primary
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
T1-47
HIGH FREQUENCY MAGNETICS
T1/E1 Through Hole Transformers
TM00121
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
TERMINAL 1
IDENTIFIER
0.35 (8.89)
MAX
0.35 (8.89)
MAX
0.023 (0.584) SQ TYP
(PHOSPHOR BRONZE,
SOLDER COATED)
0.155 (3.94)
0.023 (0.584) SQ TYP
(PHOSPHOR BRONZE,
SOLDER COATED)
0.150
(3.81)
0.110 (2.79)
±0.010 (0.25)
0.150
(3.81)
1
2
3
1
2
3
6
5
4
0.250
(6.35)
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
FAR EAST
EUROPE
Bel Fuse Inc.
198 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
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
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
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