HIGH FREQUENCY MAGNETICS T1/E1 Through Hole Transformers * Operates as a line-interface pulse transformer in DS1 and CEPT applications * Contains specific interwinding insulation to minimize capacitance * Winding (3-2)(2-1) is highly balanced * Designed for automatic machine placement into printed wiring boards * Only difference between the 2745AF and 2745AF2 is the terminal length TM00118 * Operating temperature range: -40C 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 Interwinding Capacitance pF max (4-6) (3-1) (3-1) and (4-6) 1.55 3.15 3.0 23 1000 1.55 3.15 3.0 23 1000 Inductance1 mH min (3-1) : (4-6) (3-1) (3-1) 2745AF 1CT : 2 CT 3.15 2745AF2 1CT : 2 CT 3.15 Part Number MInimum Interwinding Breakdown Voltage Vrms Leakage Inductance 2 H max Turns Ratio 2% max 1. measured at 19 kHz, 0.1V 2. measured at 100kHz, with (4-6) shorted Typical Frequency and Time Response Terminating Impedances Bandwidth (3 dB) Risetime Overshoot Droop (350 ns pulse) 100 : 400 2 kHz - 21 MHz 17 ns 0% 0.5% SCHEMATIC 2745AF 2745AF2 4 3 CT 2 5 CT 1 6 1 CT : 2 CT (c)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 T1-41 HIGH FREQUENCY MAGNETICS T1/E1 Through Hole Transformers TM00118 MECHANICAL 2745AF 2745AF2 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) 0.023 (0.584) SQ TYP (PHOSPHOR BRONZE, SOLDER COATED) 0.150 (3.81) 0.110 (2.79) 0.010 (0.25) 0.150 (3.81) 1 2 3 1 2 3 6 5 4 0.250 (6.35) 0.250 (6.35) 6 5 4 Unless otherwise specified, dimensions are nominal and in inches (millimeters). (c)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 T1-42