Vishay Intertechnology, Inc. Chassis Mount Resistors RER40F3240RC02

The RER40F3240RC02 is a chassis mount wirewound resistor from Lingto Electronic Limited, designed for military applications and qualified to MIL-PRF-39009 standards. It features an aluminum heat sink housing and a molded construction that provides total environmental protection. This resistor is non-inductive, utilizing Ayrton-Perry winding to minimize reactive components, and is suitable for mounting on a chassis to leverage the heat-sink effect. With a power rating of 5 watts at 25 °C, it has a resistance value of 324 ohms and a tolerance of ±1%. The operating temperature range is from -55 °C to +250 °C, ensuring reliability in extreme conditions. The resistor also boasts a high insulation resistance of 10,000 MΩ minimum when dry, and 1,000 MΩ minimum after moisture testing. It is constructed with a copper-nickel or nickel-chrome alloy element, a ceramic core, and an aluminum housing with hard anodic coating, making it robust for various applications. Engineers considering this resistor should note its performance in high-stress environments, including low temperature operation and moisture resistance, which are critical for military and other demanding applications.