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HIGH FREQUENCY MAGNETICS  
T1/E1 Miniature Surface Mount Tranformers  
TM00142  
Meet pulse template and return loss requirements of  
T1/E1 interface circuits  
Operating temperature range: -40° C to +85° C  
Meets IEC 695, 2-2 flammability requirements  
Minimum interwinding breakdown voltage of 1500  
Vrms  
PWB Process Capability: standard printed wiring board  
assembly techniques, total-immersion cleaning  
Maximum inductance unbalance of center-tapped  
windings is 0.2%  
Reliability testing: shock, vibration, temperature cycling,  
temperature - humidity - bias  
ELECTRICAL SPECIFICATIONS at 25° C  
DCR  
max  
Turns Ratio  
Surge Voltage Capability3  
Primary  
± 1%  
Leakage  
Interwinding  
Capacitance  
pF typ  
Part Number  
Inductance1  
mH min  
Inductance2  
µH max  
Pri : Sec  
(4 - 6)  
(3 - 1)  
Metallic  
Longitudinal  
2795R  
2795D  
2795B  
2795P  
2795C  
2795AB  
1 : 1CT  
1.5  
1.4  
1.6  
1.2  
1.3  
2.5  
0.85  
0.7  
1.6  
1.7  
35  
35  
35  
35  
35  
40  
3000  
2500  
1 : 1.08CT  
1 :1.14CT  
1 : 1.26CT  
1 : 1.35CT  
1CT: 2  
1.5  
2.2  
1.4  
1.9  
4.3  
1.7  
2.6  
1.8  
2.6  
2.2  
3000  
2500  
3000  
2500  
2500  
2500  
2500  
2500  
2500  
2500  
0.8  
0.65  
0.8  
0.8  
1. Measured at 10 kHz, 0.1 Vac  
2. measured at 100 kHz, 0.1 Vac  
3. See Supplementary Information  
SCHEMATICS  
2795B  
2795C  
2795D  
2795P  
2795R  
2795AB  
4
3
5
3
4
6
CT 5  
1
CT  
2
1
Primary  
Secondary  
6
Primary  
Secondary  
©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  
T1-93  
HIGH FREQUENCY MAGNETICS  
T1/E1 Miniature Surface Mount Tranformers  
TM00142  
MECHANICAL  
2795AB  
2795B  
2795C  
2795D  
2795P  
2795R  
0.240  
[6.10]max  
6
5
4
A
0.186  
[4.72]  
0.350  
[8.90]  
max  
0.265  
[6.73]  
ref  
0.073 [1.85]  
0.065  
[1.65]  
0.040 [1.02]  
0.057  
[1.45]  
A
Terminal 1 ID  
0.020[0.51]  
1
2
3
0.364  
[9.25]  
0.234  
[5.95]  
No metallization  
or solder mask  
in cross-hatched  
designated area  
0.073 [1.85]  
0.265  
[6.73]  
max  
0.033 [0.84]  
0.055  
[1.40]  
Suggested PCB Pad Layout  
Note: Unless otherwise specified, dimensions  
are nominal and in inches [millimeters].  
0˚/8˚  
0.015 [0.40]  
R0.023 [0.60]  
Supplementary Information  
Safety Agency Compatibility  
Surge Voltage Capability  
Flammability Compliance  
Simulation Model  
Underwriters Laboratories, Inc. UL 1950  
10/700 µs; 10 repetitions of alternating polarity, generator output: peak voltage, 25 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  
Surface-Mount Packaging  
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)  
Terminal Lead Coplanarity  
PWB Process Capability  
©2000 Bel Fuse Inc. Specifications subject to change without notice. 04.00  
CORPORATE  
FAR EAST  
EUROPE  
Bel Fuse Inc.  
Bel Fuse Ltd.  
Bel Fuse Europe Ltd.  
198 Van Vorst Street  
Jersey City, NJ 07302  
Tel 201-432-0463  
Fax 201-432-9542  
www.belfuse.com  
8F / 8 Luk Hop Street  
San Po Kong  
Kowloon, Hong Kong  
Tel 852-2328-5515  
Fax 852-2352-3706  
www.belfuse.com  
PrestonTechnology Management Centre  
Marsh Lane, Suite G7, Preston  
Lancashire, PR1 8UD, U.K.  
Tel 44-1772-556601  
Fax 44-1772-888366  
www.belfuse.com  
T1-94