1N6347US

Overview

The Microchip Technology 1N6347US is a surface-mount Zener voltage regulator in a B-SQ MELF package. It provides a nominal Zener voltage of 91V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and features a steady-state power dissipation rating of 0.5W at an end cap temperature of 150°C. Electrical characteristics include a maximum reverse current of 80µA at 25°C, a dynamic impedance of 270 ohms at the test current of 1.4mA, and a surge current capability of 1.0A.

Feature Summary

• Hermetically sealed voidless glass construction with internal metallurgical bonds for high reliability.
• Surface mount equivalent of the JEDEC registered 1N6309 through 1N6355 series.
• Inherently radiation hard and non-sensitive to electrostatic discharge (ESD).
• Available in multiple military qualification levels including JAN, JANTX, JANTXV, and JANS.

Applications

• High-reliability applications where failure cannot be tolerated.
• Voltage regulation over broad operating current and temperature ranges.
• Military and aerospace electronic circuits requiring robust construction.

Procurement Notes

Verify the specific reliability level required, as commercial versions differ from MIL-PRF-19500/533 qualified parts. Confirm RoHS compliance status if applicable, noting that compliant finishes are available on commercial grade only. Ensure the ordering suffix matches the desired voltage tolerance and termination finish specifications defined in the part nomenclature.

Selection Notes

Select this component for designs requiring a 91V reference in a compact surface-mount form factor. Consider the thermal resistance values when designing heat dissipation paths, as junction-to-end cap resistance varies by series subgroup. Verify that the application current remains within the specified maximum regulator current limits to maintain stable voltage regulation.

Part Context

This device belongs to the 1N6309US through 1N6355DUS series of 0.5-watt Zener diodes. The series offers voltage selections ranging from 2.4V to 200V with various tolerance options. These regulators utilize a B-SQ MELF package or axial leaded DO-35 packages, providing industry-standard footprint compatibility for replacement or new design implementations.

Replacement Considerations

Direct replacements include other manufacturers' equivalents meeting the 1N6347JEDEC specification. For military-grade requirements, verify that substitute parts meet the same MIL-PRF-19500/533 qualification levels and metallurgical bond categories.