HIGH FREQUENCY MAGNETICS
T1/E1 Through Hole Transformers
TM00118
•
•
Operates as a line-interface pulse transformer in
DS1 and CEPT applications
•
•
•
Operating temperature range: -40°C to +85° C
Meets IEC 695, 2-2 flammability requirements
Contains specific interwinding insulation to mini-
mize capacitance
PWB Process Capability: standard printed wiring board
assembly techniques, total-immersion cleaning
•
•
Winding (3-2)(2-1) is highly balanced
•
Reliability testing: Shock, vibration, temperature cycling,
temperature - humidity - bias
Designed for automatic machine placement into
printed wiring boards
•
Only difference between the 2745AF and 2745AF2
is the terminal length
ELECTRICAL SPECIFICATIONS AT 25° C
DCR
MInimum
Interwinding
Breakdown
Voltage
Interwinding
Capacitance
pF max
Turns Ratio
± 2%
Inductance1
mH min
Leakage Inductance 2
µH max
Ω
max
Part
Number
Vrms
(3-1) : (4-6)
1CT : 2 CT
1CT : 2 CT
(3-1)
3.15
3.15
(3-1)
1.55
1.55
(4-6)
3.15
3.15
(3-1)
3.0
(3-1) and (4-6)
2745AF
23
23
1000
1000
2745AF2
3.0
1. measured at 19 kHz, 0.1V
2. measured at 100kHz, with (4-6) shorted
Typical Frequency and Time Response
Terminating
Impedances
Bandwidth
Droop
(350 ns pulse)
Risetime Overshoot
(3 dB)
100 Ω : 400 Ω
2 kHz - 21 MHz
17 ns
0 %
0.5%
SCHEMATIC
2745AF
2745AF2
4
3
2
5 CT
6
CT
1
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
T1-41
