BEL 2745G3

HIGH FREQUENCY MAGNECTICS
T1/E1 Through Hole Transformers
•
Operates as a line-interface pulse transformer in
DS1 and CEPT applications
•
Designed for automatic machine placement into
printed wiring boards
Only difference between the 2745G and 2745G3 is
the terminal length
•
TM00117
•
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
DCR
1
Leakage
Inductance 2
µH max
Interwinding
Capacitance
pF typ
Minimum
Interwinding
Breakdown
Voltage
Vrms
Turns Ratio
± 2%
Inductance
mH min
(3-1) : (4-6)
(3-1)
(3-1)
(4-6)
(3-1)
(3-1) and (4-6)
(3-1) and (4-6)
2745G
1 : 1.14CT
1.75
0.95
1.1
1.3
80
1000
2745G3
1 : 1.14CT
1.75
0.95
1.1
1.3
80
1000
Ω
max
Part Number
1. measured at 10 kHz, 0.1 V
2. measured at 100 kHz, with (4-6) shorted
Typical Frequency and Time Response
Part Number
Terminating
Impedances
Bandwidth
(3 dB)
Risetime
Overshoot
Droop
(350 ns pulse)
2745G
10 Ω : 100 Ω
1 kHz - 25 MHz
14 ns
0%
0.1%
2745G3
10 Ω : 100 Ω
1 kHz - 25 MHz
14 ns
0%
0.1%
SCHEMATIC
2745G
2745G3
4
3
5 CT
1
6
1 : 1.14 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
T1-39
HIGH FREQUENCY MAGNECTICS
T1/E1 Through Hole Transformers
TM00117
MECHANICAL
2745G3
2745G
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)
0.150
(3.81)
1
2
3
0.250
(6.35)
0.023 (0.584) SQ TYP
(PHOSPHOR BRONZE,
SOLDER COATED)
0.150
(3.81)
0.110 (2.79)
±0.010 (0.25)
1
2
3
6
5
4
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
T1-40