HIGH FREQUENCY MAGNETICS T1/E1 Dual Ratio Surface Mount Transformer • Operates at the T1 rate of 1.544 Mb/s and the E1 rate of 2.048 Mb/s • Provides two ratios to handle both 75Ω and 120Ω lines Minimum Interwinding Breakdown Voltage of 1500 Vrms • TM00135 • 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 Turns Ratio ±2% DCR Inductance2 mH min Interwinding Capacitance pF max Ω max Leakage Inductance3 µH max Part Number 2771H (4-1):(5-2) (4-1):(5-8)1 (4-1) (4-1) (5-2) (5-8)1 (4-1) : (5-2) (4-1) : (5-8)1 (4-1)4 (4-1)5 1 : 1.08 1 : 1.36 1.85 0.74 3.2 4.0 15 23 1 1.3 Minimum Interwinding Breakdown Voltage Vrms 1500 1. connect 2 to 3 2. measured at 10 kHz, 0.1 Vac 3. measured at 100 kHz, 0.1 Vac 4. with (5-8) shorted and 2 & 3 connected 5. with (5-2) shorted SCHEMATIC 2771H 4 5 2 3 1 8 1 : 1.08 1 : 1.36 ©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 T1-79 HIGH FREQUENCY MAGNETICS T1/E1 Dual Ratio Surface Mount Transformer TM00135 MECHANICAL 2771H 0.160 (11.68) 0.590 (14.99) MAX 0.120 (3.05) 8 7 6 5 0.495 0.430 (12.57)(10.92) MAX MAX 1 2 3 4 TERMINAL 1 IDENTIFIER 0.395 (10.03) MAX 0.004 8 EDGES 0.23 (0.58) X 0.100 (2.54) FOOT (PHOSPHOR BRONZE, SOLDER COATED) 0.100 (2.54) TYP RECOMMENDED PCB PATTERN COMPONENT CENTER 0.255 (6.48) 0.120 (3.05) TYP 0.045 (1.14) TYP 0.008 (0.203) 2 PLACES 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 T1-80