Thick film power resistors with optional NTC thermistors and PC-TIM simplify design, save board space and reduce costs

Vishay Intertechnology, Inc. introduces ISOA, a new AEC-Q200 certified thick film power resistor in a small SOT-227 package for direct mounting to heat sinks.The Vishay MCB ISOA features high pulse handling capability with power dissipation up to 120 W at 85 °C chassis temperature and can be Optional NTC thermistor for internal temperature monitoring and pre-coated phase change thermal interface material (PC-TIM) for improved placement efficiency

The devices use an aluminum backing instead of sheet metal and can be used as pre-charge, discharge, active discharge, or buffer resistors to reduce costs in automotive, industrial, avionics, defense, and space (AMS) applications.ISOA has the option of integrating AEC-Q200 certified, temperature-cycled NTC thermistors within the resistor package to simplify design and save board space, with the option of PC-TIM Improve production process placement efficiency.

The device's high power and energy dissipation simplifies design and reduces the number of power devices required, thereby reducing costs. The resistors feature high-energy pulse handling (up to 110 J / 0.1 s) and are tested with 3,000 cycles of 230 J / 670 ms and 5,000 cycles of 350 J / 1060 ms multi-pulse cycling for a wide range of applications under high-energy and repetitive surge pulses. In addition, the devices offer customer-defined tests

ISOA resistors range from 0.47 Ω to 1 MΩ with ±5 % and ±10 % tolerances and TCRs of ± 100 ppm/K, ±150 ppm/K, and ± 300 ppm/K. Resistors have a maximum operating voltage of 1500 V, an operating temperature range of -55 °C to +150 °C, and a dielectric strength of 4000 Vrms. The devices are RoHS-compliant and feature a non-inductive design. Two different resistors can be included

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