1N4493

Single Zener Diodes Overview

The Microchip Technology 1N4493 is a military-qualified Zener voltage regulator featuring a hermetically sealed voidless glass package. It operates within a junction temperature range of -65°C to +175°C and dissipates up to 1.5 W at a lead temperature of +112°C. The device exhibits a nominal Zener voltage of 150 V with a test current of 1.7 mA, maximum dynamic impedance of 700 Ohms, and maximum reverse current of 25 µA.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass construction with internal metallurgical bonds for high reliability
• Qualified per MIL-PRF-19500/406 for JAN, JANTX, JANTXV, and JANS levels
• Inherently radiation hard and non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• High-reliability aerospace systems
• Military electronic circuits
• Voltage regulation in extreme temperature environments

Single Zener Diodes Procurement Notes

Verify the specific qualification level (JAN, JANTX, JANTXV, or JANS) required for your application, as this determines the manufacturing lot traceability and testing standards. Confirm terminal finish availability, noting that RoHS compliant matte tin options are restricted to commercial grade versions only. Ensure compatibility with MIL-PRF-19500/406 requirements before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select the 1N4493 when a precise 150 V reference is needed in harsh environments. Consider the 700 Ohm dynamic impedance for stability requirements. Evaluate thermal derating curves if operating near the maximum power dissipation limit. Verify that the axial-lead DO-41 package fits the mechanical constraints of the target assembly.

Single Zener Diodes Part Context

This component belongs to the 1N4460–1N4496 series of 1.5 Watt glass Zener diodes manufactured by Microchip Technology. These devices are designed for critical applications where failure is not an option. The series offers a wide voltage selection from 3.3 to 200 Volts with standard 5% tolerance, alongside tighter tolerance options available through specific ordering suffixes.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 150 V Zener voltage, 1.5 W power rating, and MIL-PRF-19500/406 qualification level. Verify that substitute components maintain the same hermetic sealing and voidless glass construction to ensure equivalent environmental resilience.