MIL-PRF-19500-383 Semiconductor Device, Diode, Silicon, Voltage-Variable Capacitor Types 1N5139A Through 1N5148A Jan, Jantx And JantxvThis specification covers the performance requirements for a silicon, voltage-variable-capacitor diode. Three levels of product assurance are provided for each encapsulated device type as specified in MIL-PRF-19500.