Vishay Intertechnology, Inc. Chassis Mount Resistors RER40F4990MCSL

The RER40F4990MCSL 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 constructed with complete welded joints and is available in non-inductive styles, utilizing Ayrton-Perry winding to minimize reactive components. With a power rating of 5 watts at 25 ¬8C, the resistor has a resistance value of 499 ohms and a tolerance of ¬±1%. It operates effectively within a temperature range of -55 ¬8C to +250 ¬8C. The insulation resistance is rated at a minimum of 10,000 MOc when dry, and 1,000 MOc after moisture testing. The device is suitable for applications requiring high reliability and performance under extreme conditions. Engineers considering this resistor should note its robust construction and military-grade specifications, making it suitable for demanding environments.