HIGH FREQUENCY MAGNETICS Specialty Surface Mount Shielded Transformer • Operates as a high frequency pulse transformer or as a high frequency analog transformer in various telecom circuits requiring very high voltage step-up ratio • Interwinding Electrostatic Shield provides low capacitance and high EMI suppression • Electrical equivalents: 2664F, 2741P2, 2779A TM00107 • 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 Nominal Turns Ratio ±1% 1 2779A DCR Inductance2 µH min max Leakage Inductance 2 µH max Ω (3-7) : (2-1) (2-5) (3-8) (4-7) (2-1)3 (3-7)1 1 CT : 25 CT 300 1.92 0.20 Interwinding Capacitance4, 5, 6 pF max Minimum Interwinding Breakdown Voltage Vrms 5 500 1. connect 4 to 8 2. measured at 100 kHz, 0.02 Vac 3. connect 4 to 8 & 2 to 7 4. (3-8) to 6 with (2-1) grounded 5. (4-7) to 6 with (2-1) grounded 6. (3-7) to (2-1) with 6 grounded and 4 connected to 8 SCHEMATIC 2779A 2 3 8 5 CT CT 4 1 7 6 1 : 25 ©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 T1-15 HIGH FREQUENCY MAGNETICS Specialty Surface Mount Shielded Transformer TM00107 MECHANICAL 2779A 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 T1-16