ISDN MAGNETICS Dual S Interface Transformers TM9938 • Low profile 0.175" package • Minimum interwinding breakdown voltage of 1500 Vrms • Compatible with PC card applications • Qualified per Bellcore TR-TSY-000357-1 • UL and CSA approved ELECTRICAL SPECIFICATIONS at 25° C Part Number Turns Ratio ± 2% Primary Inductance* mH min DCR Ω max Leakage Inductance µH max Pri Sec Interwinding Capacitance pF max Distributed Parallel Capacitance pF max 2800A 1.0 : 2.5 22.0 4.75 6.0 10.5 100 100 2800B 1.0 : 2.0 22.0 5.0 6.0 8.5 100 100 2800C 1.0 : 2.0 22.0 3.75 6.0 8.5 100 100 2800D 1.0 : 2.0 22.0 2.50 6.0 8.5 100 100 2800E 1.0 : 1.0 22.0 5.00 6.0 6.0 100 100 * Measured at 10 kHz, 0.5 Vac Compatible Transceiver ICs Part Number 2800A 2800B IC Manufacturer IC Part Number Lucent T7250C T7256 T7234 Lucent T7901 T7903 Siemens PEB2081 PEB2085 PEB2086 Mitel MT8930 National Semiconductor TP3420 TP3421 Alcatel MTC-2072 AMD 79C30A 79C32A Motorola MC145474 MC145475 T1 SCHEMATIC 2800A 2800B 2800C 2800D 2800E 1 16 2 15 3 14 4 13 T2 5 12 6 11 7 10 2800C 2800D 2800E 8 Primary ©1999 Bel Fuse Inc. 9 Secondary 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 T328 ISDN MAGNETICS Dual S Interface Transformers TM9938 MECHANICAL 2800A 2800B 2800C 2800D 2800E 0.945 [24.00] max 16 15 14 13 12 11 10 9 Terminal 1 ID 1 2 3 4 5 6 0.100[2.54] typ 7 8 0.175 [4.44] max 0.600 [15.24] 0.715 [18.16] +0.010 [0.25] – 0.005 [0.13] Note: Unless otherwise specified, dimensions are nominal and in inches [millimeters]. Terminal Pad 0.065 [1.65] Board Cutout 0.615 [15.62] 0.745 [18.92] 0.107 [2.72] typ 0.050 [1.27] typ 0.060 [1.52] typ 0.100 [2.54] typ 0.975 [24.76] Suggested PCB Pad Layout ©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 T329