ISOA Power Thick Film Resistors Vishay ISOA Power Thick Film Resistors are AEC-Q200 qualified components that are built on an Alumina substrate in a SOT-227 package for mounting directly on a heatsink. The resistors can integrate an NTC Thermistor inside the resistor package to enable direct temperature monitoring while applying power. The high power/volume ratio resistors are available with pre-applied Phase Change Thermal Interface Material to help streamline the resistor installation during production. The non-inductive 120W resistors handle energy pulses (i.e., 110J for 0.1s), are available in values that range from 0.47Ω to 1MΩ in ±5% and ±10% tolerances, and feature a 1500V maximum operating voltage rating.