HIGH FREQUENCY MAGNETICS T1/E1 Surface Mount Shielded Hardened Transformers • Operates at the rate of 1.544 Mb/s and the E1 rate of 2.048 Mb/s • Interwinding Electrostatic Shield provides low capacitance and high EMI suppression 2771K and S553-6500-84: Winding (4-1) is hardened to handle a 6A surge for 1 second • • 2771M: All windings are hardened to handle a 6A surge for 1 second • Minimum Interwinding Breakdown Voltage of 1500 Vrms TM00141 • 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 Turns Ratio ± 2% Part Number Primary Inductance1 mH min Pri : Sec Ω Leakage Inductance2 µH max Interwinding Capacitance3 pF max max Pri Sec3 2771K 1 CT : 2 2.75 2.8 0.70 2.50 10 2771M 1 : 1.37 CT 1.10 0.65 0.45 0.65 5 S553-6500-84 1 CT : 1 2.75 2.8 0.70 1.25 10 1. measured at 10 kHz, 0.1 Vac 2. measured at 100 kHz, 0.1 Vac 3. with shield grounded SCHEMATICS 2771M 4 S S553-6500-84 2771K S 5 5 4 1 Primary 7 2 6 3 8 1 2 Secondary Primary 8 6 Secondary ©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 T1-91 HIGH FREQUENCY MAGNETICS T1/E1 Surface Mount Shielded Hardened Transformers TM00141 MECHANICAL S553-6500-84 2771K 2771M 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 T1-92