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HIGH FREQUENCY MAGNETICS
Miniature Dual Turns Ratio Surface Mount Transformers
* Transformers provide a dual turns ratio for DS1, CEPT 75 and CEPT 120 line interface functions Maximum inductance unbalance of center-tapped winding is 0.2% Metallic surge voltage capability for 2795Y is 5000V peak * 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 For 2795T and 2795Y application note refer to document TM00145B For 2795N application note refer to document TM00145A
TM00145
*
*
*
ELECTRICAL SPECIFICATIONS at 25 C
Turns Ratio 1% Part Number (4 - 1) : (3 - 6) (4 - 5) : (3 - 6) Primary Inductance1 mH min Leakage Inductance2 H max DCR max
Interwinding Capacitance pF typ (3 - 6)
(4 - 1)
(4 - 1)
(4 - 5)
(4 - 5)
(4 - 1)
2795G
1 : 1.14CT
1 : 1.35CT
1.8
---
0.8
1.8
2.2
2.5
35
2795N
1 : 1.070CT
1 : 1.353CT
1.7
0.6
0.5
1.7
2.2
2.3
36
2795T
1 : 1.89CT
1 : 2.40CT
1.3
0.6
0.45
1.4
1.8
3.3
47
Part Number
(3 - 6) : (4 - 5)
(3 - 6) : (4 - 1)
(3 - 6)
--
(4 - 5)
(4 - 1)
(3 - 6)
2795Y
1 : 1.89
1 : 2.39
1.6
0.3
--
0.8
1.1
0.3
43
1. Measured at 10 kHz, 0.1 Vac 2. Measured at 100 kHz, 0.1 Vac
SCHEMATICS
2795G 2795N 2795T 2795Y
3
3
4
2
4
2 CT 5 1 6
5 6 1
Note: Pins 2 and 3 must be connected externally.
(c)2000 Bel Fuse Inc. Specifications subject to change without notice. 07.00
Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com T1-99
HIGH FREQUENCY MAGNETICS
TM00145
Miniature Dual Turns Ratio Surface Mount Transformers
0.240 [6.10] max 6 5 4 A
MECHANICAL
2795G 2795N 2795T 2795Y
0.186 [4.72] 0.040 [1.02] 0.065 [1.65] 0.057 [1.45]
0.073 [1.85]
0.347 [8.80] max
0.265 [6.73] ref
A Terminal 1 ID 1 0.020 [0.51] 2 3 0.073 [1.85]
0.364 [9.25]
0.234 [5.95]
No metallization or solder mask in cross-hatched designated area
0.033 (0.84)
0.265 [6.73] max 0.055 [1.40]
Suggested PCB Pad Layout
Note: Unless otherwise specified, dimensions are nominal and in inches [millimeters].
Supplementary Information Operating Temperature Range Safety Agency Compatibility Surge Voltage Capability Metallic Voltage Longitudinal Voltage Flammability Compliance Qualification Compliance Simulation Model Surface-Mount Packaging
Terminal Lead Coplanarity PWB Process Capability
-40 C to +85 C Underwriters Laboratories, Inc. UL 1459 10/700 s; 10 repetitions of alternating polarity 2500 V peak generator output, 25 generator resistance 2500 V peak generator output, 25 generator resistance IEC-695, 2-2 (needle flame test), materials are UL 94 VO approved Bellcore TR-TSY-000357-1(shock, vibration, temperature cycling, temperature-humidity-bias) 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] Standard printed-wiring board assembly and cleaning techniques Standard solder reflow techniques Machine placement (recommendation: locate by terminals, not body)
(c)2000 Bel Fuse Inc. Specifications subject to change without notice. 07.00
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
T1-100

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