SUM90N08-4m8P_RC Vishay Siliconix R-C Thermal Model Parameters DESCRIPTION The parametric values in the R-C thermal model have been derived using curve-fitting techniques. These techniques are described in "A Simple Method of Generating Thermal Models for a Power MOSFET"[1]. When implemented in P-Spice, these values have matching characteristic curves to the Single Pulse Transient Thermal Impedance curves for the MOSFET. R-C values for the electrical circuit in the Foster/Tank and Cauer/Filter configurations are included. Note: For a detailed explanation of implementing these values in P-SPICE, refer to Application Note AN609 Thermal Simulations Of Power MOSFETs on P-SPICE Platform. R-C THERMAL MODEL FOR TANK CONFIGURATION R-C VALUES FOR TANK CONFIGURATION Thermal Resistance (°C/W) Junction to Ambient Case Foot RT1 N/A 141.7251 m N/A RT2 N/A 88.3714 m N/A RT3 N/A 231.1810 m N/A RT4 N/A 38.7225 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 N/A 111.9545 m N/A CT2 N/A 46.4999 m N/A CT3 N/A 264.1647 m N/A CT4 N/A 10.8135 m N/A This document is intended as a SPICE modeling guideline and does not constitute a commercial product data sheet. Designers should refer to the appropriate data sheet of the same number for guaranteed specification limits. Document Number: 69835 Revision: 08-Nov-07 www.vishay.com 1 SUM90N08-4m8P_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Junction to Ambient Case Foot RF1 N/A 80.7834 m N/A RF2 N/A 172.5803 m N/A RF3 N/A 135.1016 m N/A RF4 N/A 111.5347 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 N/A 8.5974 m N/A CF2 N/A 28.2127 m N/A CF3 N/A 78.2834 m N/A CF4 N/A 384.8007 m N/A Note: NA indicates not applicable Reference: [1] "A Simple Method of Generating Thermal Models for a Power MOSFET" by Wharton McDaniel and Kandarp Pandya, IEEE / SEMITHERM 2002 www.vishay.com 2 Document Number: 69835 Revision: 08-Nov-07 SUM90N08-4m8P_RC Vishay Siliconix Document Number: 69835 Revision: 08-Nov-07 www.vishay.com 3