BEL 2745F2

HIGH FREQUENCY MAGNETICS
T1/E1 Through Hole Hardened Transformers
•
Designed to operate at the DS1 rate of 1.544 Mbits/s
as a line interface transformer
•
Only difference between 2745F and 2745F2 is the
terminal length
Winding (3-1) can handle a 6 A surge current for 1
second
•
•
TM00128
•
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
Designed for remote powering with simplex-feed
current
ELECTRICAL SPECIFICATIONS AT 25° C
Part Number
Nominal
Turns Ratio
±2%
DCR
Ω
Inductance1
mH Min
Leakage
Inductance
µH max
(3-1)
(4-6)
Minimum
Interwinding
Breakdown
Voltage
Vrms
(3-1) : (6-4)
(3-1)
max
min
max
min
(3-1)
2745F
1CT : 2
3.15
0.65
0.42
5.2
4.3
1.7
850
2745F2
1CT : 2
3.15
0.65
0.42
5.2
4.3
1.7
850
1. measured at 10 kHz, 0.1 Vac
SCHEMATIC
2745F
2745F2
3
6
CT 2
1
4
1 CT : 2
©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
T1-63
HIGH FREQUENCY MAGNETICS
T1/E1 Through Hole Hardened Transformers
TM00128
MECHANICAL
2745F
2745F2
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 F23, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com
T1-64