T-1269

ISDN U-Interface Transformer P/N T-1269 Turns Ratio (PRI : SEC) (1-2 : 3-4) (5-6 : 7-8) Parameter Inductance 5-8 (6-7, shorted) Return Loss At 40 kHz Total Harmonic Distortion 1 DC Resistance 1 - 2 DC Resistance 3 - 4 DC Resistance 5 - 6 DC Resistance 7 - 8 Hi-Pot Primary to Secondary 1.80 1.45 4.00 4.00 500 1:1.5 : + 1% 1.58 : 1 1:1 Min. 21.6 28 70 2.20 1.80 5.00 5.00 Typ. 27 Max. 32.4 Units mH dB dB Ω Ω Ω Ω VRMS Schematic Diagram 1 2 3 4 5 6 7 8 SEC 24Ω 24Ω 30Ω PRI 1. With 90 mADC through SEC and 40 kHz sine wave injected into the PRI at a level which generates 5V p-p into 135 ohms at the SEC. Designed to meet the requirements for national ISDN U-INTERFACE chip TP3410 .840 (21.34) .800 (20.32) Pin Position Grid 0.100 (2.54) Holes For Bobbin Pins Holes For Clip Pins .640 (16.26) .197 (5.00) NOM. Pin Diameter is 0.026 (0.66) .039 (0.99) TYP. 8 7 6 5 Physical Dimensions inches (mm) Bottom View 1 2 3 4 9/8/99 Rhombus Industries Inc. Transformers & Magnetic Products 15801 Chemical Lane, Huntington Beach, CA 92649 Phone: (714) 898-0960 www.rhombus-ind.com FAX: (714) 896-0971