Vishay / Sfernice

ISOA Series Thick-Film Resistors

Vishay's resistors offer an optional NTC thermistor and phase-change thermal interface material

Image of Vishay Sfernice's ISOA Series Thick-Film ResistorsVishay's ISOA series are AEC-Q200-qualified thick-film power resistors built on an Alumina substrate in an SOT-227 package for mounting directly onto a heatsink. The resistors feature the ability to integrate an NTC thermistor inside the resistor package to enable direct temperature monitoring while applying power. Vishay also offers the option to deliver the resistors with a pre-applied phase-change thermal interface material to help streamline the installation of the resistor in production. The 120 W resistors can handle high energy pulses (110 J for 0.1 s, for example), are non-inductive, offered in values between 0.47 Ω and 1 MΩ in tolerances of 5% or 10%, and feature a 1,500 V operating voltage rating.

Features
  • Package size: SOT-227
  • Power rating: 120 W at +85°C case temperature with heatsink mounted
  • Resistance range: 0.47 Ω to 1 MΩ
  • Resistance tolerances: ±5% or ±10%
  • Maximum operating voltage: 1,500 V
  • High pulse energy capability (110 J for 0.1 s, for example)
  • Dielectric strength: 3,000 VRMS
  • Dielectric strength power resistor to NTC thermistor: 1,500 VRMS
  • Optional NTC thermistor integrated in-package
  • Optional pre-applied phase change thermal interface material (PC-TIM)
  • Operating temperature range: -55°C to +150°C
  • Non-inductive: less than or equal to 50 nH
  • AEC-Q200 qualified
Applications
  • Battery-powered electric vehicles
  • Fuel-cell electric vehicles
  • Passenger vehicles
  • Commercial vehicles
  • Active discharge
  • Passive discharge
  • Pre-charge
Published: 2022-11-15

Related Product Training Modules

ISOA Chassis Mount Resistors This presentation will provide an overview of the ISOA Series including the features, benefits and performance of the product series, and instructions for mounting and connecting the resistors.