HIGH FREQUENCY MAGNETICS Specialty Surface Mount Shielded Transformer • Operates as high frequency pulse transformer in telecom switching systems at various signaling rates • Interwinding Electrostatic Shield provides low capacitance and high EMI suppression • TM00108 • 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 equivalents: 2664A, 2741L2, 2779D ELECTRICAL SPECIFICATIONS AT 25° C Part Number DCR Nominal Turns Ratio ±2% Secondary Inductance1 mH min Pri : Sec (5-2) : (4-1) (4-1) (4-1) (5-2) 1:2 1.58 3.3 2.05 2779D Secondary Leakage Inductance2 µH Ω max (4-1) 8.5 max 6.5 min Interwinding & Winding to Shield Capacitance3 pF max (4-1) : 64 (4-1) : (5-2)5 Minimum Interwinding Breakdown Voltage Vrms 12 3 1500 1. measured at 100 kHz, 0.05 Vac 2. measured at 1 MHz, 0.05 Vac 3. measured at 1 kHz, 1 Vac 4. with (5-2) grounded 5. with 6 grounded SCHEMATIC 2779D 5 4 2 1 6 1:2 ©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 T1-17 HIGH FREQUENCY MAGNETICS Specialty Surface Mount Shielded Transformer TM00108 MECHANICAL 2779D 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 T1-18