ISDN MAGNETICS Dual S Interface Transformer • Consists of two identical transformer assemblies mounted in a molded 16-pin DIP terminal header TM9935 • Minimum interwinding breakdown voltage of 2400 Vrms • Qualified per Bellcore TR-TSY-000357-1 ELECTRICAL SPECIFICATIONS at 25° C Part Number 2768A Turns Ratio ± 2% 1 : 2.5 Primary Inductance mH min 22.0 DCR Ω max Leakage Inductance µH max 4.0 Pri Sec 2.3 5.8 Interwinding Capacitance pF max Distributed Parallel Capacitance pF max 100 100 SCHEMATIC 2768A Compatible Transceiver ICs 1 IC Mfr IC Part Number Lucent T7250C T7256 T7234 16 2 CT 3 4 13 5 12 6 CT 7 8 Primary 9 Secondary ©1999 Bel Fuse Inc. Specifications subject to change without notice. 06.99 Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com T322 ISDN MAGNETICS Dual S Interface Transformer TM9935 MECHANICAL 2768A 0.930 [23.62] max 0.510 [12.95] max 0.110 [2.79] 0.100 [2.54] 0.110 [2.79] Terminal 1 Identifier 1 2 3 4 5 6 7 8 0.495 [12.57] max 0.400 [10.16] 16 15 14 13 12 11 10 9 Terminals 0.020 sq. Note: Unless otherwise specified, dimensions [0.508] are nominal and in inches [millimeters]. ©1999 Bel Fuse Inc. Specifications subject to change without notice. 06.99 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 F23, Preston Lancashire, PR1 8UD, U.K. Tel 44-1772-556601 Fax 44-1772-888366 www.belfuse.com T323