X8504-A

Document 231 xDSL Interface Transformers For LT1794, LT1795 and LT1886 This product is not RoHS-compliant. Contact Coilcraft for current status or possible alternatives. These transformers provide coupling and line isolation for xDSL interfaces using the Linear Technology LT1794, LT1795 and LT1886 amplifiers. They feature very low leakage inductance, stable primary inductance from -40°C to +85°C and longitudinal balance optimized for the best overall performance at ADSL and HDSL2 transmission speeds. In addition to the standard models shown, Coilcraft can provide custom transformers with other turn ratios. For free evaluation samples or to discuss custom designs, contact Coilcraft or visit www.coilcraft.com. Part number X8390-A X8502-A X8505-A X8504-A Part number X8390-A X8502-A X8505-A X8504-A Style SMT SMT SMT SMT Dielectric strength (V) 1500 1500 1500 1500 Chip set LT1794, LT1886 LT1794, LT1886 LT1886 LT1795 Turns ratio1 line : chip 1:1 1 : 1.2 1 : 1.5 1 : 1.4 Line side inductance (mH) 0.368 ±5% 0.368 ±5% 0.368 ±5% 0.368 ±5% Leakage inductance (µH) max 11 11 11 11 DCR max (Ohms) Chip side Line side 0.841 (6-9, 7-10) 0.895 (6-9, 7-10) 0.750 (6-9, 7-10) 0.875 (6-9, 7-10) 1.95 (4-2) 1.70 (4-2) 1.85 (4-2) 1.75 (4-2) Longitudinal balance (dB) min 45 (20 kHz - 1.1 MHz) 42 (20 kHz - 1.1 MHz) 42 (20 kHz - 1.1 MHz) 42 (20 kHz - 1.1 MHz) Designed to meet UL 1459, UL 1459, UL 1459, UL 1459, 1950 1950 1950 1950 Line side Chip side 6 4 E 1. Turns ratio is with the chip side windings connected in series. 2. All electrical specifications referenced to line side. 3. Operating temperature range -40°C to +85°C. 4. Electrical specifications at 25°C. Dot above pin1 5 6 9 F 7 2 G A C 1 10 10 B Recommended Land Pattern A max B max 0.530 13,46 0.699 17,75 C max 0.500 12,70 E 0.590 14,99 F typ 0.098 2,50 G typ 0.061 × 0.050 1,55 × 1,27 Chip side windings to be connected in series on the PC board Tape and reel 175 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth Specifications subject to change without notice. Please check our website for latest information. Document 231 Revised 01/16/08 © Coilcraft, Inc. 2007