MODEM MAGNETICS V.90 Modem Transformer TM00409 • Provides isolation and balance while minimizing signal distortion and insertion loss in high speed modem applications • Designed to match a 600Ω line to a 360Ω load • Qualified per Bellcore TR-TSY-000357-1 • Designed to provide supplementary insulation at a working voltage of 250V • Approved by UL, CSA and BABT • Minimum interwinding breakdown voltage of 1500 Vrms ELECTRICAL SPECIFICATIONS at 25° C Part Number Turns Ratio ± 2% 2811B 1:1 Insertion Loss dB Return Loss dB Frequency Response dB DCR Ω max @ 1 kHz 200 Hz - 3500 Hz 100 Hz - 4 kHz Pri < 2.1 > 20 < 0.1 135 Harmonic Distortion dB Longitudinal Balance dB Sec -3dBm, 150 Hz 200 Hz - 3500 Hz 135 < -75 > 60 SCHEMATIC 2811B 1 6 3 4 Primary Secondary TYPICAL SPICE TRANSMISSION MODEL 120 6.2 mH 120 1 6 35 pF 3 120k 40 H 35 pF 4 ©2000 Bel Fuse Inc. Specifications subject to change without notice. 05.00 Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com T4-19 MODEM MAGNETICS V.90 Modem Transformer TM00409 MECHANICAL 2811B 0.565 [14.35] 0.118 [3.00] 0.020 [0.508] Sq. wire 0.300 [7.62] 1 3 0.710 [18.03] max sq. 0.500 [12.70] 6 4 Note: Unless otherwise specified, dimensions are nominal and in inches [millimeters]. ©2000 Bel Fuse Inc. Specifications subject to change without notice. 05.00 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 T4-20