2795M

HIGH FREQUENCY MAGNETICS DS3/E3/STS-1 Dual-ratio Surface Mount Transformer • Miniature transformer supports E3, DS3, SONET STS-1 rates (34.368, 44.736, 51.84 Mb/s) Dual ratios for multiple applications: Turns ratios: 1:1 and 1:2CT Impedance ratios: 1:1 and 1:4 Superior temperature linearity External shield for EMI suppression • • Can handle 15 mA DC Bias • Minimum interwinding breakdown voltage of 1500 Vrms Precision machine winding: 1% tolerance • • • • 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 TM00149 • • • ELECTRICAL SPECIFICATIONS at 25° C DCR (1 - 6) (1-6) :(3-4)1 2795M 1:1 (1-6) : (3-5)2 1 : 2 CT (1 - 6) 42 µH max 0.1 Ω max 0.2 (2-5) Ω max 0.2 (3-4) Ω max 0.2 pF typ 10 Surge Voltage Capability2 Metallic V peak 4000 Longitudinal V peak 2500 Part Number Turns Ratio ± 1% Inductance3 µH min Leakage Inductance4 Interwinding Capacitance 1. with 2 & 3 connected and 4 & 5 connected 2. with 2 and 4 connected 3. measured at 10 kHz, 0.1 Vac 4. measured at 100 kHz, 0.1 Vac Typical Frequency and Time Response Terminating Impedances 75Ω : 75Ω & 75Ω : 300Ω Bandwidth (3 dB) 150 kHz - 350 MHz Risetime 0.8 ns SCHEMATICS 2795M 5 6 5 4 6 2 4 1 2 3 1 3 ©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 T1-115 HIGH FREQUENCY MAGNETICS TM00149 DS3/E3/STS-1 Dual-ratio Surface Mount Transformer MECHANICAL 2795M 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] 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 T1-116