HIGH FREQUENCY MAGNETICS T1/E1 Miniature Surface Mount Tranformers • Meet pulse template and return loss requirements of T1/E1 interface circuits • Minimum interwinding breakdown voltage of 1500 Vrms Maximum inductance unbalance of center-tapped windings is 0.2% • TM00142 • 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 ± 1% Primary Inductance1 mH min DCR Ω max Leakage Inductance2 µH max Pri : Sec Interwinding Capacitance pF typ (4 - 6) (3 - 1) Surge Voltage Capability3 Metallic Longitudinal 2795R 1 : 1CT 1.5 0.85 1.6 1.7 35 3000 2500 2795D 1 : 1.08CT 1.4 0.7 1.5 1.7 35 3000 2500 2795B 1 :1.14CT 1.6 0.8 2.2 2.6 35 2500 2500 2795P 1 : 1.26CT 1.2 0.65 1.4 1.8 35 3000 2500 2795C 1 : 1.35CT 1.3 0.8 1.9 2.6 35 2500 2500 2795AB 1CT: 2 2.5 0.8 4.3 2.2 40 2500 2500 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 4 2795AB 3 3 5 4 CT 5 CT 2 6 Primary 1 1 Primary 6 Secondary 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 1 2 0.020 [0.51] 3 0.073 [1.85] 0.364 0.234 [9.25] [5.95] 0.265 [6.73] max 0.055 [1.40] No metallization or solder mask in cross-hatched designated area 0.033 [0.84] Suggested PCB Pad Layout Note: Unless otherwise specified, dimensions are nominal and in inches [millimeters]. 0˚/8˚ 0.015 [0.40] Supplementary Information Safety Agency Compatibility Surge Voltage Capability Flammability Compliance Simulation Model Surface-Mount Packaging Terminal Lead Coplanarity PWB Process Capability R 0.023 [0.60] 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 FAR EAST EUROPE Bel Fuse Inc. 198 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 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 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 T1-94