1N6343

Overview

The Microchip Technology 1N6343 is a military-qualified Zener voltage regulator diode designed for high-reliability applications. It features a 62 V nominal Zener voltage with a standard ±5% tolerance and operates within a junction temperature range of -65°C to +175°C. The device provides a maximum steady-state power dissipation of 0.5 W and exhibits a dynamic impedance of 125 Ohms at a test current of 2 mA. It utilizes a hermetically sealed voidless-glass DO-35 package with axial leads.

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
• Military electronic equipment
• Harsh environment circuit protection
• Precision voltage reference regulation

Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these levels dictate the manufacturing lot traceability and screening requirements. Confirm RoHS compliance status if applicable, noting that commercial versions may differ from military qualified parts. Ensure the ordering suffix matches the desired voltage tolerance and packaging configuration.

Selection Notes

Select this component when a robust, radiation-hardened Zener diode is needed for critical voltage regulation. The 0.5 W power rating suits low-current reference circuits. Consider the thermal resistance characteristics for derating calculations in enclosed environments. Verify lead finish options, as tin/lead or matte tin finishes are available depending on the grade.

Part Context

This part belongs to the 1N6309 through 1N6355D series of 500 mW glass Zener diodes. The series offers a wide voltage selection from 2.4 V to 200 V. The 1N6343 specifically targets the 62 V breakdown region. It is manufactured by Microchip Technology, formerly Microsemi, which specializes in rugged semiconductor solutions.

Replacement Considerations

Equivalent parts include JAN1N6343, JANTX1N6343, JANTXV1N6343, and JANS1N6343. These variants share identical electrical specifications but differ in reliability screening levels and manufacturing traceability according to MIL-PRF-19500/533.