"U" INTERFACE TRANSFORMER Turns Ratio ( + 5% ) 1.6 : 1.6 : 1 : 1 Electrical Specifications at 25OC Parameter Min. Inductance (1-4), Shorted pins 2-3 (1) Inductance (1-4), Shorted pins 2-3 (2) Typ. 17.5 90 DC Resistance With pins 2-3, Shorted (1-4) DC Resistance With pins 6-7, Shorted (5-8) 3.9 3.8 Pins (1-4) to (5-8) Schematic Diagram 1 5 µH 2 6 pF 3 7 4 8 mH 70 Interwinding Capacitance (1) Units mH 13.3 Leakage Inductance (1) Hi-Pot Max. 4.9 4.8 5.8 5.7 1500 Ω Ω VRM 1. Measured at 10 kHz, 100 Vrms, 0 mAdc. 2. Measured at 10 kHz, 100 Vrms, 60 mAdc. .740 (18.8) 1 8 7 6 5 2 Bottom View 3 4 T-1291 YYWW Physical Dimensions .024 (0.60) ..024 (0.60) 8 .150 (3.81) 7 .200 (5.08) 6 .150 (3.81) 5 Suggested Solder Pad Layout for both Surface Mount Versions inches (mm) 1 2 3 4 .866 (22.0) .700 (17.8) 0.77 (19.6) Max. .492 (12.5) .024 (0.60) TYP. .200 .150 (5.08) ((3.81) TYP. .010 (0.25) TYP. 0.06 (1.6) RHOMBUS P/N: T-1291 CUST P/N: DATE: 05-09-2001 Rhombus Industries Inc. Transformers & Magnetic Products NAME: SHEET: 15801 Chemical Lane, Huntington Beach, CA 92649 Phone: (714) 898-0960 FAX: (714) 896-0971 www.rhombus-ind.com