100 BASE-T4 TRANSFORMERS Designed to provide isolation and impedance matching for 4 twisted pairs in a 100 Mbps Transmission over UTP-3 Cable. Four Transformers per Unit Designed for popular 100Base-T4 transiever chips Electrical Specifications at 25o C Turns OCL Part Ratio Min. ( µH ) Number +3% T-15200 T-15201 1:2CT 2CT:1CT 350 350 IEEE 802.3 Compatible LL max. ( µH ) DCRP max. (Ω) Cw/w max. ( pF ) Isolation (VRMS) 1.0 1.0 0.5 1.0 14 10 1500 1500 Fast Rise Times Common Mode Choke available for improved EMI performance The above parts are avaiable in surface mount versions. Add suffix "G". See data sheet for dimensions. T-15200 Schematic Diagram PRI T-15200 : Designed for use with SEEQ 80C240P 24 T-15201 : Designed for use with Cypress CY7C971 1 PRI 23 22 21 2 3 4 SEC PRI 20 19 18 5 6 7 SEC T-15200 Schematic Diagram PRI PRI 17 16 15 8 9 10 SEC 14 13 11 12 24 1 PRI 23 22 21 2 3 4 SEC SEC PRI 20 19 18 5 6 7 SEC PRI 17 16 15 8 9 10 SEC 13 11 12 SEC .285 (7.24) MAX. 1.280 (32.51) MAX. Physical Dimensions .020 .295 (0.51) (7.49) TYP. MAX. inches (mm) .008 R (0.20) .300 (7.62) SMD versions available on Tape & Reel 14 .120 (3.05) MIN. .040 (1.02) TYP. .018 (0.46) TYP. 100 BASE-T4 COMMON MODE CHOKE .010 (0.25) TYP. .365 (9.27) MAX. .100 (2.54) TYP. Electrical Specifications at 25o C Part Number Turns Ratio +3% OCL Min. ( µH ) LL max. ( µH ) DCRP max. (Ω) Cw/w max. ( pF ) Isolation (VRMS) F-1515 1 :1 36 0.2 0.35 15 500 Impedance ( Ohms ) 4000 Typical 3000 2000 Minimum 1000 0 Impedance Ω (Min.) 10 200 300 .285 (7.24) .505 (12.83) MAX. MAX. 2000 @ 30 Mhz 1500 @ 50 Mhz 1000 @ 70 Mhz .205 (5.21) MAX. .016 (0.41) TYP. Rhombus Industries Inc. 40 60 80 100 Frequency ( MHz ) Dimensions in Inches (mm) F-1515 Schematic Diagram Specifications subject to change without notice. 20 .050 (1.27) TYP. For other values & Custom Designs, contact factory. 27 .015 (0.38) TYP. .025 (0.64) TYP. .010 (0.25) TYP. .380 (9.65) .360 (9.14) 100BASET - 4/99 15801 Chemical Lane, Huntington Beach, CA 92649-1595 Tel: (714) 898-0960 • Fax: (714) 896-0971