Derating design refers to the effective method of reducing the failure rate of electronic components when they operate under conditions below their rated stress. Therefore, in the design process, while ensuring technical performance indicators, the operating voltage range, temperature characteristics, electrical characteristic parameters, etc. of electronic components are all reduced by using the method of reducing the failure rate of electronic components under various stress conditions.

Derating design requires different factors to be considered for different components: some are voltage range, some are current magnitude, some are temperature, some are frequency, some are vibration, and so on. In general, the voltage resistance, frequency, and temperature characteristics of capacitors, the power of resistors, the current and frequency characteristics of inductors, the junction current, junction temperature, or fanout coefficient of diodes, transistors, thyristors, operational amplifiers, drivers, gate circuits, etc., the voltage/current and temperature resistance performance of power switches and main power cables, the frequency characteristics of signal cables, and the use of heat sinks, connectors, module power supplies, etc., require a derating design.