2745F2

HIGH FREQUENCY MAGNETICS T1/E1 Through Hole Hardened Transformers • Designed to operate at the DS1 rate of 1.544 Mbits/s as a line interface transformer Only difference between 2745F and 2745F2 is the terminal length Winding (3-1) can handle a 6 A surge current for 1 second Designed for remote powering with simplex-feed current • • • • 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 TM00128 • • • ELECTRICAL SPECIFICATIONS AT 25° C Part Number Nominal Turns Ratio ±2% Inductance1 mH Min (3-1) DCR Ω Leakage Inductance µH max (4-6) Minimum Interwinding Breakdown Voltage Vrms (3-1) : (6-4) 2745F 2745F2 1CT : 2 1CT : 2 (3-1) 3.15 3.15 max 0.65 0.65 min 0.42 0.42 max 5.2 5.2 min 4.3 4.3 (3-1) 1.7 1.7 850 850 1. measured at 10 kHz, 0.1 Vac SCHEMATIC 2745F 2745F2 3 CT 2 1 1 CT : 2 6 4 ©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 T1-63 HIGH FREQUENCY MAGNETICS TM00128 T1/E1 Through Hole Hardened Transformers MECHANICAL 2745F 2745F2 0.56 (14.22) MAX 0.56 (14.22) MAX 0.46 (11.68) MAX 0.46 (11.68) MAX TERMINAL 1 IDENTIFIER 0.35 (8.89) MAX 0.35 (8.89) MAX TERMINAL 1 IDENTIFIER 0.155 (3.94) 0.150 (3.81) 1 0.250 (6.35) 6 5 4 2 3 0.023 (0.584) SQ TYP (PHOSPHOR BRONZE, SOLDER COATED) 0.110 (2.79) ±0.010 (0.25) 0.023 (0.584) SQ TYP (PHOSPHOR BRONZE, SOLDER COATED) 0.150 (3.81) 1 2 3 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 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 F23, Preston Lancashire, PR1 8UD, U.K. Tel 44-1772-556601 Fax 44-1772-888366 www.belfuse.com T1-64