HIGH FREQUENCY MAGNETICS
T1/E1 Miniature Surface Mount Tranformers
•
Meet pulse template and return loss requirements of T1/ •
E1 interface circuits
•
Designed to meet stringent requirements of low-voltage
•
applications
Maximum inductance unbalance of center-tapped
windings is 0.2%
Minimum interwinding breakdown voltage of 1500 Vrms
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
TM00143
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•
•
•
ELECTRICAL SPECIFICATIONS at 25° C
Part Number
Turns Ratio
± 1%
Primary
Inductance
1
mH min
Leakage
Inductance
2
µH max
(4 - 6)
DCR
Ω
max
Surge Voltage Capability
3
Interwinding
Capacitance
pF typ
(3 - 1)
2.3
3.7
3.8
3.7
35
45
47
45
Metallic
V peak
3000
2500
2500
2500
Longitudinal
V peak
2500
2500
2500
2500
Pri : Sec
2795K
2795H
2795L
2795J
1 : 1.93CT
1 : 2CT
1 : 2.1CT
1 : 2.45CT
0.810
1.3
4
1.1
0.950
0.4
0.5
0.6
0.4
1.2
1.8
1.8
1.5
1. measured at 10 kHz, 0.5 Vac
2. measured at 100 kHz, 0.1 Vac
3. See Supplementary Information
4. measured at 10 kHz, 0.1 Vac
SCHEMATIC
Minimum Return Loss for 2795J and 2795K
used with Lucent 3.3 volt transceivers
Frequency
Interface
2795H
2795J
2795K
2795L
4
51 kHz
102 kHz
2 MHz
3 MHz
3
2 CT
Receive
14 dB
20 dB
20 dB
16 dB
6
Transmit
1
1
Secondary
9 dB
15 dB
15 dB
11 dB
Primary
1. For transmit, only, place external capacitor of 470 pF ± 10% across winding (4-6)
©2000 Bel Fuse Inc. Specifications subject to change without notice. 04.00
Bel Fuse Inc.
198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
T1-95
BEL [ BEL FUSE INC. ]
