1N6349

Overview

The Microchip Technology 1N6349 is a military-qualified Zener voltage regulator diode from the 1N6309 through 1N6355D series. It features a nominal Zener voltage of 110 V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65 °C to +175 °C and dissipates up to 0.5 W at a lead temperature of 75 °C. Electrical characteristics include a maximum reverse current of 80 µA at 25 °C, dynamic impedance of 500 Ω at the test current of 1.1 mA, and a positive temperature coefficient of +0.110 %/°C.

Feature Summary

• Hermetically sealed voidless glass construction with internal metallurgical bonds for high reliability
• Qualified per MIL-PRF-19500/533 for JAN, JANTX, JANTXV, and JANS levels
• Inherently radiation hard and non-sensitive to electrostatic discharge

Applications

• High-reliability aerospace and defense circuits
• Voltage regulation in extreme temperature environments
• Critical systems where component failure cannot be tolerated

Procurement Notes

Verify the specific ordering suffix (e.g., C or D) to confirm the required voltage tolerance, as tighter tolerances are available. Confirm RoHS compliance status if environmental regulations apply, noting that compliant versions are commercial grade only. Ensure the selected reliability level matches the project's qualification requirements.

Selection Notes

Select this component when a robust, hermetically sealed Zener diode is required for high-voltage regulation applications. Consider the positive temperature coefficient and low dynamic impedance suitable for stable reference voltages. Evaluate thermal derating curves based on the expected ambient conditions and mounting configuration.

Part Context

This part belongs to the industry-standard JEDEC registered 1N6309 through 1N6355 series. The series offers an extensive selection of Zener voltages ranging from 2.4 V to 200 V. It is available in both axial-lead DO-35 packages and surface-mount MELF configurations to suit various design constraints.

Replacement Considerations

Direct substitutes within the same family include other 1N63xx series variants with different voltage ratings. Cross-brand replacements must match the 0.5 W power rating, hermetic sealing, and MIL-PRF-19500/533 qualification standards.