HIGH FREQUENCY MAGNETICS T1/E1 Through Hole Transformer • Operates as a line-interface pulse transformer in DS1 and CEPT applications • Winding (3-2) (2-1) is highly balanced • Designed for automatic machine placement into printed wiring boards • Recommended replacement is 2745AF2 TM00115 • 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 2745B DCR Turns Ratio ± 2% Inductance1 mH min (3-1) : (4-6) (3-1) (3-1) 1CT : 2 CT 3.5 4.9 Leakage Inductance 2 µH max Interwinding Capacitance pF typ (4-6) (3-1) (3-1) and (4-6) MInimum Interwinding Breakdown Voltage Vrms 10.2 7.0 110 850 Ω max 1. measured at 10 kHz, 0.1 V 2. measured at 100 kHz, with (4-6) shorted SCHEMATIC 2745B 4 3 CT 2 5 CT 1 6 1 CT : 2 CT ©2000 Bel Fuse Inc. Specifications subject to change without notice. 09.00 Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com T1-35 HIGH FREQUENCY MAGNETICS T1/E1 Through Hole Transformer TM00115 MECHANICAL 2745B 0.56 (14.22) MAX 0.46 (11.68) MAX TERMINAL 1 IDENTIFIER 0.35 (8.89) MAX 0.023 (0.584) SQ TYP (PHOSPHOR BRONZE, SOLDER COATED) 0.155 (3.94) 0.150 (3.81) 1 2 3 6 5 4 0.250 (6.35) Unless otherwise specified, dimensions are nominal and in inches (millimeters). ©2000 Bel Fuse Inc. Specifications subject to change without notice. 09.00 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 T1-36