2745AF Datasheet, PDF (1/2 Pages) Bel Fuse Inc. – HIGH FREQUENCY MAGNETICS T1/E1 Through Hole Transformers

HIGH FREQUENCY MAGNETICS
T1/E1 Through Hole Transformers
TM00118
• Operates as a line-interface pulse transformer in
DS1 and CEPT applications
• Contains specific interwinding insulation to mini-
mize capacitance
• Winding (3-2)(2-1) is highly balanced
• Designed for automatic machine placement into
printed wiring boards
• Only difference between the 2745AF and 2745AF2
is the terminal length
• 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
Turns Ratio
± 2%
Inductance¹
mH min
(3-1) : (4-6)
(3-1)
2745AF
1CT : 2 CT
3.15
2745AF2
1CT : 2 CT
3.15
1. measured at 19 kHz, 0.1V
2. measured at 100kHz, with (4-6) shorted
DCR
Ω
max
(3-1)
1.55
1.55
(4-6)
3.15
3.15
Leakage Inductance ²
µH max
(3-1)
3.0
3.0
Typical Frequency and Time Response
Terminating
Impedances
Bandwidth
(3 dB)
Risetime
Overshoot
Droop
(350 ns pulse)
100 Ω : 400 Ω 2 kHz - 21 MHz 17 ns
0%
0.5%
Interwinding
Capacitance
pF max
(3-1) and (4-6)
23
23
MInimum
Interwinding
Breakdown
Voltage
Vrms
1000
1000
SCHEMATIC
2745AF
2745AF2
3
4
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 [phone] • Fax [phone] • www.belfuse.com
T1-41