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Passive Component Derating
Meaning
Practice of operating capacitors, resistors, and inductors at levels below their maximum rated limits extends the operational life of an electronic assembly. This reduction in stress accounts for the effects of temperature and voltage on the aging of materials. Passive component derating is a standard procedure in high-reliability industries such as telecommunications and automotive electronics.
Thermal Constraint
High ambient temperatures reduce the ability of a component to dissipate heat. The thermal constraint of the passive component derating limits the allowed power dissipation to prevent the internal temperature from exceeding safe levels. Failure to follow these limits leads to premature component failure or fire.
Voltage Margin
Dielectric breakdown in capacitors is more likely when operating near the maximum rated voltage. The voltage margin of the passive component derating provides a safety buffer against transients and spikes. For example, a ceramic capacitor rated for fifty volts might be used in a twelve-volt circuit to ensure longevity.
This margin also compensates for the loss of capacitance that occurs in some materials at higher voltages.
Reliability Calculation
Engineers use established curves and tables to determine the appropriate load levels for a given environment. The reliability calculation of the passive component derating quantifies the increase in mean time between failures. Properly derated parts are less likely to drift in value over time.