Vishay provides a recommended PCB layout and land pattern in their application note AN10343, which can be found on their website. It's essential to follow these guidelines to ensure proper thermal performance and reliability.
The TIM should be applied evenly and thinly to the base plate of the resistor. Vishay recommends using a thermal interface material with a thermal conductivity of at least 1 W/m-K. The TIM should be applied according to the manufacturer's instructions to ensure optimal thermal performance.
The maximum allowed voltage derating for HRHAFN22R0KB is 2.5% per 1000 feet of altitude above sea level. This means that for every 1000 feet of altitude, the maximum allowed voltage should be reduced by 2.5% to ensure reliable operation.
While HRHAFN22R0KB is designed for high-power applications, it's not optimized for high-frequency use. The resistor's self-resonant frequency is around 100 MHz, and using it above this frequency may lead to reduced performance and potential oscillations. For high-frequency applications, consider using a resistor specifically designed for high-frequency use.
To ensure reliability in a humid environment, it's essential to follow proper storage and handling procedures. Store the resistors in a dry, cool place, and avoid exposing them to moisture. If the resistors are exposed to humidity, bake them according to Vishay's recommended procedure to remove any moisture before installing them on the PCB.
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