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
•
•
•
•
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
HIGH FREQUENCY MAGNETICS
TM00143
T1/E1 Miniature Surface Mount Tranformers
MECHANICAL
0.240
[6.10] max
6
5
4
A
0.186
[4.72]
0.265
[6.73]
ref
0.350
[8.90]
max
0.073 [1.85]
0.040 [1.02]
0.065
[1.65]
2795H
2795J
2795K
2795L
0.057
[1.45]
A
Terminal 1 ID
1
0.020 [0.51]
2
3
0.073 [1.85]
0.364 0.234
[9.25] [5.95]
No metallization
or solder mask
in cross-hatched
designated area
0.265
[6.73]
max
0.055
[1.40]
0˚/8˚
0.033 [0.84]
Suggested PCB Pad Layout
Note: Unless otherwise specified, dimensions
are nominal and in inches [millimeters].
0.015 [0.40]
R 0.023 [0.60]
Supplementary Information
Safety Agency Compatibility
Surge Voltage Capability
Flammability Compliance
Simulation Model
Surface-Mount Packaging
Terminal Lead Coplanarity
PWB Process Capability
Underwriters Laboratories, Inc. UL 1950
10/700 µs; 10 repetitions of alternating polarity, generator output: peak voltage, 25
Ω
source
IEC-695, 2-2 (needle flame test), materials are UL 94 VO approved
SPICE computer simulation file available on request
Tape and Reel; 16 mm wide by 12 mm pitch; 13 inch OD; 4 inch ID
650 transformers per reel, maximum
Meets ANSI/EIA 481-2 Carrier Tape Standards—JEDEC SO package
0.004 inch [0.10 mm]
Machine placement (recommendation: locate by terminals, not body)
©2000 Bel Fuse Inc. Specifications subject to change without notice. 04.00
CORPORATE
Bel Fuse Inc.
198 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
FAR EAST
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
EUROPE
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
T1-96
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