2798B

ISDN MAGNETICS Dual S Interface Transformers • Meet requirements for pulse template and impedance template according to ITU-T (CCITT I.430) UL and CSA approved • Qualified per Bellcore TR-TSY-000357-1 • • • TM9937 Minimum interwinding breakdown voltage of 1500 Vrms Operating temperature range 0° C to 85° C ELECTRICAL SPECIFICATIONS at 25° C DCR Ω max Part Number Turns Ratio ± 2% Primary Inductance mH min Leakage Inductance µH max Pri Interwinding Capacitance pF max Sec 7.5 6.0 4.45 6.0 3.5 100 100 100 100 100 Distributed Parallel Capacitance pF max 2798A 2798B 2798C 2798D 2798E 1.0 : 2.5 1.0 : 2.0 1.0 : 2.0 1.0 : 2.0 1.0 : 1.0 22.0 22.0 22.0 22.0 22.0 5.0 5.0 3.75 2.5 5.0 3.5 3.5 2.25 3.5 3.5 100 100 80 100 40 Compatible Transceiver ICs Part Number IC Manufacturer IC Part Number T7250C T7256 T7234 T7901 T7903 PEB2081 PEB2085 PEB2086 MT8930 TP3420 TP3421 79C30A 79C32A MC145474 MC145475 SCHEMATIC 2798A 2798B 2798C 2798D 2798E 1 T1 16 2798A Lucent 2 3 15 14 2798B Lucent 4 T2 5 13 Siemens 12 2798C Mitel National Semiconductor 6 7 11 10 2798D AMD 2798E Motorola 8 9 Primary 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 T326 ISDN MAGNETICS TM9937 Dual S Interface Transformers 0.950 [24.13] max 0.1.22 [3.10] typ 16 15 14 13 12 11 10 9 MECHANICAL 2798A 2798B 2798C 2798D 2798E 1 2 3 4 5 6 7 8 0.100 [2.54] typ 0.300 [7.62] max 0.595 [15.11] typ 0.015 [0.38] 0.705 [17.91] + 0.010 [0.25] – 0.005 [0.13] Note: Unless otherwise specified, dimensions are nominal and in inches [millimeters]. 0.030 [0.76] Terminal Pad 0.035 [0.89] 0.755 [19.18] typ 0.060 [1.52] typ 0.060 [1.52] typ 0.100 [2.54] typ Suggested PCB Pad Layout Tape and reel packaging: 400 parts/reel ©1999 Bel Fuse Inc. Specifications subject to change without notice. 06.99 CORPORATE Bel Fuse Inc. 198 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com FAR EAST 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 EUROPE 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 T327