1N6346US

Overview

The Microchip Technology 1N6346US is a surface-mount Zener voltage regulator featuring a voidless hermetically sealed glass package. It provides an 82V nominal breakdown voltage with standard 5% tolerance, operating at a test current of 1.5mA. The device exhibits a maximum dynamic impedance of 220 ohms and supports a maximum DC regulator current of 62mA. Designed for high-reliability environments, it withstands junction temperatures from -65°C to +175°C and dissipates up to 0.5W.

Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonds
• Military qualification per MIL-PRF-19500/533 standards
• Inherently radiation hard design
• Non-sensitive to electrostatic discharge

Applications

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

Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these levels dictate testing and screening protocols. Confirm RoHS compliance status if environmental regulations apply, noting that commercial versions may differ from military qualified parts. Ensure the ordering suffix matches the desired voltage tolerance and packaging configuration before finalizing procurement.

Selection Notes

Select this component when a robust surface-mount solution is needed for precise voltage reference in extreme conditions. The B-SQ MELF package offers a compact footprint suitable for space-constrained designs. Consider the thermal resistance characteristics and power derating curves to ensure stable operation within the specified temperature range without exceeding the maximum power dissipation limits.

Part Context

This part belongs to the 1N6309US through 1N6355DUS series of 0.5-watt Zener diodes. The series covers a wide voltage range from 2.4V to 200V. The 'US' suffix indicates the surface-mount MELF package variant, which serves as the equivalent to the axial-leaded DO-35 packages found in the traditional JEDEC registered series.

Replacement Considerations

Direct replacements include other 1N6346 variants with different reliability suffixes such as JAN1N6346US or JANTX1N6346US, provided the electrical parameters match. Axial-leaded equivalents like 1N6346D are available but require different mounting considerations.