1N6338

Overview

The Microchip Technology 1N6338 is a military-qualified Zener voltage regulator diode from the 1N6309 through 1N6355D series. It features a nominal Zener voltage of 39V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and dissipates up to 0.5W at a lead temperature of 75°C. It utilizes a voidless hermetically sealed glass package with axial leads, available in DO-35 or 'D' configurations.

Feature Summary

• Hermetically sealed voidless hard glass construction with internal metallurgical bonds for high reliability.
• Qualified per MIL-PRF-19500/533 standards across JAN, JANTX, JANTXV, and JANS levels.
• Inherently radiation hard and non-sensitive to electrostatic discharge (ESD).
• Capable of regulating voltage over a broad operating current and temperature range.

Applications

• High-reliability aerospace and defense circuits where failure cannot be tolerated.
• Voltage regulation in harsh environments requiring extended temperature performance.
• Radiation-hardened electronic systems and space-grade instrumentation.

Procurement Notes

Verify the specific reliability level required, such as JAN, JANTX, JANTXV, or JANS, as these designations dictate qualification standards and testing rigor. Confirm RoHS compliance status if applicable, noting that commercial versions may differ from military specifications. Ensure the package type matches the intended mounting method, either axial leaded DO-35 or surface mount variants.

Selection Notes

Select this component when a robust, hermetically sealed Zener diode is needed for critical applications. The 1N6338 provides a stable 39V reference point with tight thermal stability. Consider the power derating curves for ambient temperatures exceeding 55°C. Verify that the maximum surge current and reverse leakage characteristics align with the circuit's protection requirements.

Part Context

This part belongs to the industry-standard 1N6309 through 1N6355D series of 0.5-watt Zener voltage regulators. Originally developed by Microsemi and now manufactured by Microchip Technology, the series offers extensive voltage selections ranging from 2.4V to 200V. These components are widely recognized for their durability and consistent performance in demanding industrial and military sectors.

Replacement Considerations

Direct substitutes include other manufacturers' equivalents meeting MIL-PRF-19500/533 specifications for the 1N6338 designation. Surface-mount alternatives within the same family include the 1N6338US variant. Verify pinout compatibility and thermal resistance values before substituting with generic commercial Zener diodes.