The specification of what the target applications need from the power or compound device: voltage and current class, losses, switching speed, ruggedness, temperature, package and qualification level.
Requirements Work product in the Power and compound semiconductor lifecycle
It is the agreed statement of application needs that drives product requirements, the target datasheet, substrate and epitaxy choices and the device concept. When each team reads the application differently, material and device choices chase moving targets and qualification needs are discovered late.
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