ISDN MAGNETICS UPO Interface Transformer • Qualified per Bellcore TR-TSY-000357-1 • Approved by UL and CSA TM9939 • Minimum interwinding breakdown voltage of 1500 Vrms ELECTRICAL SPECIFICATIONS at 25° C Part Number 2805A Turns Ratio ± 2% 1.0 : 1.25 Primary Inductance mH min 1.70 DCR Ω max Leakage Inductance µH max 12.0 Interwinding Capacitance pF max Pri Sec 3.91 3.00 90 SCHEMATIC Compatible Transceiver ICs IC Mfr IC Part Number Siemens PEB2095 2805A 8 1 7 2 6 3 5 4 Primary ©1999 Bel Fuse Inc. Secondary Specifications subject to change without notice. 09.99 Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com T330 ISDN MAGNETICS UPO Interface Transformer TM9939 MECHANICAL 2805A 0.450 [11.43] max 0.125± 0.015 [3.17 ± 0.38] Terminal 0.020 sq. [0.508] 0.200 [5.08] Notch locates terminal #1 0.750 [19.05] max 1 4 8 5 0.750 [19.05] max 0.600 [15.24] Note: Unless otherwise specified, dimensions are nominal and in inches [millimeters]. ©1999 Bel Fuse Inc. Specifications subject to change without notice. 09.99 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 T331