1N6347

Overview

The Microchip Technology 1N6347 is a military-qualified Zener voltage regulator diode with a nominal breakdown voltage of 91.0 V and a maximum tolerance of ±5%. It operates within a junction temperature range of -65°C to +175°C and features a steady-state power dissipation rating of 0.5 W. The device utilizes a voidless hermetically sealed glass package, available in axial-lead DO-35 or surface-mount SQ MELF configurations.

Feature Summary

• Hermetically sealed construction using voidless hard glass with tungsten slugs for high-reliability environments.
• Military qualification per MIL-PRF-19500/533 across JAN, JANTX, JANTXV, and JANS reliability levels.
• Inherently radiation-hardened design suitable for aerospace and defense applications.

Applications

• High-reliability aerospace systems
• Defense electronics requiring failure-intolerant components
• Radiation-hardened circuit protection

Procurement Notes

Verify the specific suffix (e.g., D, US) against the datasheet nomenclature to confirm the exact package type and voltage tolerance. Confirm that the required reliability level matches the intended application environment. Ensure compliance with RoHS requirements if applicable, as commercial versions differ from military specifications.

Selection Notes

Select this component when a stable 91 V reference is needed in harsh environments. Consider the thermal resistance values based on whether the lead temperature or ambient air is the primary heat sink. Evaluate the surge current capability against potential transient events in the target circuit design.

Part Context

This part belongs to the 1N6309 through 1N6355D series of 500 mW Zener diodes. The series covers a wide voltage range from 2.4 V to 200 V, offering standard and tight tolerances. It serves as a robust voltage regulation solution for industrial and specialized electronic circuits.

Replacement Considerations

Direct substitutes include other parts within the 1N6309–1N6355D series or equivalent military-grade Zener diodes meeting MIL-PRF-19500/533 standards. Verify pinout compatibility and ensure the replacement meets the same hermetic sealing and radiation hardness requirements.