BEL 2745B

HIGH FREQUENCY MAGNETICS
T1/E1 Through Hole Transformer
•
Operates as a line-interface pulse transformer in
DS1 and CEPT applications
•
Winding (3-2) (2-1) is highly balanced
•
Designed for automatic machine placement into
printed wiring boards
•
Recommended replacement is 2745AF2
TM00115
•
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
ELECTRICAL SPECIFICATIONS AT 25° C
Part
Number
2745B
DCR
Turns Ratio
± 2%
Inductance1
mH min
(3-1) : (4-6)
(3-1)
(3-1)
1CT : 2 CT
3.5
4.9
Leakage Inductance 2
µH max
Interwinding
Capacitance
pF typ
(4-6)
(3-1)
(3-1) and (4-6)
MInimum
Interwinding
Breakdown
Voltage
Vrms
10.2
7.0
110
850
Ω
max
1. measured at 10 kHz, 0.1 V
2. measured at 100 kHz, with (4-6) shorted
SCHEMATIC
2745B
4
3
CT 2
5 CT
1
6
1 CT : 2 CT
©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
T1-35
HIGH FREQUENCY MAGNETICS
T1/E1 Through Hole Transformer
TM00115
MECHANICAL
2745B
0.56 (14.22)
MAX
0.46 (11.68)
MAX
TERMINAL 1
IDENTIFIER
0.35 (8.89)
MAX
0.023 (0.584) SQ TYP
(PHOSPHOR BRONZE,
SOLDER COATED)
0.155 (3.94)
0.150
(3.81)
1
2
3
6
5
4
0.250
(6.35)
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
T1-36