HIGH FREQUECY MAGNETICS T1/E1 Surface Mount Transformer • Operates at the T1 rate of 1.544 Mbits/s and at the E1 rate of 2.048 Mbits/s • Designed for transmit and receive line interface applications • Can replace 2771C with no PWB changes • Low-capacitance design for EMI suppression • 1500-Volt isolation TM00136 • 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 2779B DCR Nominal Turns Ratio ±2% Inductance2 mH min Leakage Inductance3 µH max (4-1):(5-8)1 (4-1)1 (4-1)1 (5-8)1 (4-1)1 1CT : 2 CT 3.0 1.6 3.1 3.0 Ω max Interwinding Capacitance1 pF typ Minimum Interwinding Breakdown Voltage1 Vrms 20 1500 1. connect 2 to 3 & 6 to 7 2. measured at 10 kHz, 0.1 Vac 3. measured at 100 kHz SCHEMATIC 2779B 4 5 2 7 3 6 1 8 CT CT 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 T1-81 HIGH FREQUECY MAGNETICS T1/E1 Surface Mount Transformers TM00136 MECHANICAL 2779B 8 7 6 5 8 7 6 5 1 2 3 4 0.256 (6.50) TERMINAL 1 IDENTIFIER 1 2 3 4 0.160 (4.06) 0.350 (8.89) MAX 0.050 (1.27) 0.100 (2.54) 0.004 8 EDGES 0.100 1 2 3 4 0.490 (12.45) MAX 0.430 (10.92) MAX 0.500 (12.7) MAX 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 T1-82