The ISOA is an AEC-Q200 qualified thick film power resistor in the compact, low profile SOT-227 package for mounting on a heatsink. It is the only such device available with an optional NTC thermistor for internal temperature monitoring and pre-applied Phase Change Thermal Interface Material (PC-TIM) for more efficient mounting — all without a metal tab. Instead, it’s built on an exposed alumina substrate, which lowers costs for automotive applications, in which the device serves as a precharge, discharge, active discharge, or snubber resistor.
With the option to integrate an AEC-Q200 qualified, temperature cycle tested NTC thermistor inside the resistor package, the ISOA simplifies designs and saves board space, while its optional PC-TIM streamlines installation in production. The resistor’s high pulse handling capability and high power dissipation up to 120 W at an 85 °C bottom case temperature provide additional space and cost saving by reducing the need for power components. For applications subject to high and repetitive pulse surges, the device can handle high energy pulses (i.e., 110 J for 0.1 s) and is multi-pulsed tested at 230 J for 670 ms and 3000 cycles and 350 J for 1060 ms and 5000 cycles. Additional custom testing options for the resistor are also available.
ISOA offers lower resistance than competing solutions — down to 0.47Ω — with tolerances of ± 5 % and ± 10 %, and TCR of ± 100 ppm/K, ± 150 ppm/K, and ± 300 ppm/K. The resistor offers a maximum operating voltage of 1500 V, an operating temperature range of -55 °C to +150 °C, and dielectric strength of 4000 Vrms. With its lower thermal resistance of 0.25 K/W, the ISOA can dissipate more power at +150 °C than other thick film resistors can at +155 °C. The RoHS-compliant device offers a non-inductive design and can include two different resistors.