2795K

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 Inductance1 mH min Leakage Inductance2 µH max (4 - 6) DCR Ω max Surge Voltage Capability3 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 1.34 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 Transmit1 9 dB 15 dB 15 dB 11 dB 1 Secondary 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