1N6338US

Overview

The Microchip Technology 1N6338US is a military-qualified Zener voltage regulator diode designed for high-reliability applications. It features a voidless hermetically sealed glass package with internal metallurgical bonds, ensuring robust construction. The device provides a nominal Zener voltage of 39V at a test current of 3.2mA, with a maximum dynamic impedance of 55 ohms and a maximum reverse leakage current of 10µA at 25°C. It operates within a junction temperature range of -65°C to +175°C and supports steady-state power dissipation up to 0.5W.

Feature Summary

• Hermetically sealed voidless hard glass package with tungsten slugs
• Internal metallurgical bonds for enhanced reliability
• Qualified per MIL-PRF-19500/533 standards
• Inherently radiation hard

Applications

• High-reliability aerospace systems
• Military defense electronics
• Critical voltage regulation circuits
• Harsh environment instrumentation

Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these levels dictate qualification standards. Confirm RoHS compliance status if applicable, noting that commercial versions may differ from military grades. Ensure the ordering suffix matches the desired tolerance and packaging configuration before finalizing procurement.

Selection Notes

Select this component when a surface-mount equivalent to the axial-leaded 1N63xx series is needed without compromising hermetic sealing. Consider the thermal resistance values (RθJA and RθJEC) for derating calculations in enclosed spaces. Verify that the 39V breakdown voltage aligns with the circuit's reference requirements and that the 0.5W power rating accommodates the expected operating current.

Part Context

This part belongs to the 1N6309US through 1N6355DUS series of 0.5-watt Zener voltage regulators. The series offers a wide selection of voltages from 2.4V to 200V with various tolerance options. It serves as the surface-mount MELF package alternative to traditional axial-leaded JEDEC registered diodes, maintaining similar electrical characteristics in a compact form factor.

Replacement Considerations

Direct replacements include other parts within the 1N6309US–1N6355US series from Microchip/Microsemi. For axial-leaded equivalents, refer to the corresponding 1N63xx numbers. Ensure any substitute maintains the same hermetic seal and military qualification level if used in critical environments.