JANS1N4478

Single Zener Diodes Overview

The JANS1N4478 is a military-qualified Zener voltage regulator diode manufactured by Microchip Technology. It features a nominal Zener voltage of 36 V with a tolerance of ±5%. The device supports a maximum power dissipation of 1.5 W and exhibits a Zener impedance of 27 Ohms. It operates within an extended temperature range from -65°C to +175°C. The component utilizes a surface-mount SQ-MELF, A package (D-5A) and maintains a reverse leakage current of 50 nA at 28.8 V.

Single Zener Diodes Feature Summary

• Military-grade qualification compliant with MIL-PRF-19500/406 standards for high-reliability applications
• Hermetically sealed void-less glass construction ensuring environmental stability
• Internal metallurgical bond providing robust mechanical integrity

Single Zener Diodes Applications

• High-reliability aerospace systems requiring failure-intolerant components
• Military electronic circuits demanding strict environmental sealing
• Precision voltage regulation in extreme temperature environments

Single Zener Diodes Procurement Notes

Verify the specific suffix designation against official Microchip documentation to confirm exact electrical tolerances and packaging variations. Ensure procurement channels are authorized to guarantee authenticity and traceability required for military specifications. Confirm compliance with current export control regulations before finalizing acquisition.

Single Zener Diodes Selection Notes

Select this component when hermetic sealing and military qualification are mandatory requirements. The surface-mount D-5A package facilitates automated assembly while maintaining ruggedness. Evaluate thermal management needs given the 1.5 W power rating and wide operating temperature range to ensure stable performance under load.

Single Zener Diodes Part Context

This part belongs to the 1N4478 series of 1.5 Watt Zener diodes offered by Microchip Technology. The series includes commercial, JAN, JANTX, JANTXV, and JANS levels, with the JANS variant representing the highest reliability tier suitable for space and defense applications.

Single Zener Diodes Replacement Considerations

Publicly confirmed parameter-equivalent substitutes include JAN1N4478US, JAN1N4478CUS, JANTX1N4478CUS, JANTX1N4478DUS, JANTX1N4478US, JANTXV1N4478US, and JANTXV1N4478US/TR.