1N4994

Single Zener Diodes Overview

The Microchip Technology JAN1N4994 is a military-qualified, voidless hermetically sealed glass Zener diode with a nominal voltage of 330 V. It operates within a temperature range of -65°C to +175°C and dissipates up to 5 Watts at a lead temperature of 65°C. The device features a maximum reverse leakage current of 2 µA at 400 V and a maximum continuous regulator current of 14.4 mA. Its dynamic impedance is 2200 Ohms at the test current of 4 mA, with a thermal resistance of 22°C/W.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonds for high reliability
• Military qualification per MIL-PRF-19500/356 suitable for critical applications
• Inherently radiation hard and non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• High-reliability aerospace systems
• Military-grade power regulation circuits
• Radiation-hardened electronic designs

Single Zener Diodes Procurement Notes

Verify that the specific part number includes the JAN prefix to confirm compliance with MIL-PRF-19500/356 military standards. Confirm package type and termination finish requirements against project specifications before ordering. Ensure supply chain sources provide valid traceability documentation for defense or aerospace procurement.

Single Zener Diodes Selection Notes

Select this component when a robust, high-voltage Zener regulator is required for extreme environments. The 5-watt rating supports significant power dissipation compared to standard signal diodes. Verify that the 330 V breakdown voltage aligns with circuit design needs and that the axial-lead package fits the available board space.

Single Zener Diodes Part Context

This device belongs to the 1N4954 through 1N4996 series of 5-watt Zener diodes manufactured by Microsemi (now Microchip). These components are designed for demanding industrial and military sectors where long-term stability and failure prevention are paramount. The series covers a wide voltage range from 3.3 V to 390 V.

Single Zener Diodes Replacement Considerations

Equivalent parts include JAN1N4993 (300V) and JAN1N4995 (360V) from the same series. Surface-mount equivalents are available as 1N4994US in a MELF configuration.