ADSL MAGNETICS Through Hole Transformers • 2718AF2 and 2718AH2 operate over the frequency range from 1kHz to 1.1MHz • 2718BK2 operates over the frequency range from 500Hz to 1.1MHz TM9957 • Designed for broadband applications • Minimum interwinding breakdown voltage of 1500 Vrms • Qualified per Bellcore TR-TSY-000357-1 ELECTRICAL SPECIFICATIONS at 25° C Turns Ratio ± 3% Part Number DCR Ω max Primary Inductance mH min Pri : Sec Insertion Loss dB typ Pri Sec Frequency Response dB Interwinding Capacitance pF max 1kHz 1MHz 2718AF2 1.0 : 1.0 25.5 2.80 2.30 0.20 0.50 0.50 7.0* 2718AH2 1.0 : 1.0 25.5 2.80 2.30 0.20 0.50 0.50 10.0 2718BK2 1.0 : 1.0 11.0 1.50 1.50 N/A N/A N/A 30 * Terminal 8 grounded SCHEMATICS 2718AF2 1 S 2718BK2 2718AH2 4 1 4 1 10 10 7 10 7 3 8 2 5 2 5 2 9 6 9 6 4 7 9 8 Primary Secondary Primary Secondary Primary Secondary ‘S’ denotes an electrostatic shield. ©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 T514 ADSL MAGNETICS Through Hole Transformers TM9957 MECHANICAL 2718AF2 2718AH2 2718BK2 0.52 [13.21] max 0.110 ± 0.010 [2.79 ± 0.25] 0.035 x 0.016 [0.89 x 0.41] 0.023 [0.584] sq typ (Phosphor Bronze, Solder-Coated) 0.59 [14.99] max 0.175 [4.44] 0.61 [15.49] max 0.100 [2.54] Centers Terminal 1 Identifier 5 6 4 7 3 8 2 9 1 10 0.508 [12.90] 0.450 [11.43] Note: Unless otherwise specified, dimensions 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 T515