HIGH FREQUENCY MAGNECTICS T1/E1 Through Hole Transformers • Operates as a line-interface pulse transformer in DS1 and CEPT applications • Designed for automatic machine placement into printed wiring boards Only difference between the 2745G and 2745G3 is the terminal length • TM00117 • 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 DCR 1 Leakage Inductance 2 µH max Interwinding Capacitance pF typ Minimum Interwinding Breakdown Voltage Vrms Turns Ratio ± 2% Inductance mH min (3-1) : (4-6) (3-1) (3-1) (4-6) (3-1) (3-1) and (4-6) (3-1) and (4-6) 2745G 1 : 1.14CT 1.75 0.95 1.1 1.3 80 1000 2745G3 1 : 1.14CT 1.75 0.95 1.1 1.3 80 1000 Ω max Part Number 1. measured at 10 kHz, 0.1 V 2. measured at 100 kHz, with (4-6) shorted Typical Frequency and Time Response Part Number Terminating Impedances Bandwidth (3 dB) Risetime Overshoot Droop (350 ns pulse) 2745G 10 Ω : 100 Ω 1 kHz - 25 MHz 14 ns 0% 0.1% 2745G3 10 Ω : 100 Ω 1 kHz - 25 MHz 14 ns 0% 0.1% SCHEMATIC 2745G 2745G3 4 3 5 CT 1 6 1 : 1.14 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 T1-39 HIGH FREQUENCY MAGNECTICS T1/E1 Through Hole Transformers TM00117 MECHANICAL 2745G3 2745G 0.56 (14.22) MAX 0.56 (14.22) MAX 0.46 (11.68) MAX 0.46 (11.68) MAX TERMINAL 1 IDENTIFIER TERMINAL 1 IDENTIFIER 0.35 (8.89) MAX 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 0.250 (6.35) 0.023 (0.584) SQ TYP (PHOSPHOR BRONZE, SOLDER COATED) 0.150 (3.81) 0.110 (2.79) ±0.010 (0.25) 1 2 3 6 5 4 0.250 (6.35) 6 5 4 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 T1-40