1N6339US

Overview

The Microchip Technology 1N6339US is a military-qualified Zener voltage regulator diode designed for high-reliability applications. It features a voidless hermetically sealed glass package with an internal metallurgical bond, providing robust construction suitable for environments where failure cannot be tolerated. The device operates within a junction and storage temperature range of -65°C to +175°C and dissipates up to 0.5 W at a case temperature of 150°C. Key electrical characteristics include a nominal Zener voltage of 43 V, a maximum dynamic impedance of 65 ohms, and a surge current rating of 2.5 A.

Feature Summary

• Hermetically sealed voidless hard glass package with tungsten slugs and copper end caps.
• Internal metallurgical bonds ensuring extreme robustness and non-sensitivity to electrostatic discharge.
• Inherently radiation-hardened construction as described in manufacturer technical notes.
• Available in multiple reliability levels including JAN, JANTX, JANTXV, and JANS per MIL-PRF-19500/533.

Applications

• High-reliability aerospace and defense circuits requiring zero-failure tolerance.
• Voltage regulation over broad operating current and temperature ranges.
• Radiation-hardened electronic systems.
• Small surface mount Melf (D Package) implementations.

Procurement Notes

Verify the specific ordering suffix against the part nomenclature table to confirm the exact reliability level and voltage tolerance required. Ensure the procurement specification matches the intended commercial or military qualification grade, noting that RoHS compliance is available only on commercial versions. Confirm package type and termination finish requirements prior to purchase.

Selection Notes

Select this component when a surface-mount equivalent to the axial-leaded 1N6309 series is needed without compromising hermetic sealing or thermal performance. Consider the specific dynamic impedance and noise density requirements for precision regulation. Evaluate the power derating curves relative to the expected ambient or case temperatures to ensure operation remains within the 0.5 W steady-state dissipation limit.

Part Context

This device belongs to the 1N6309US through 1N6355DUS series of industry-recognized 0.5 watt Zener voltage regulators. The series offers extensive selections from 2.4 to 200 volts with standard 5% tolerances and tighter 1% and 2% options. While primarily known in axial-leaded DO-35 packages, the US variants provide the same performance in a compact surface-mount form factor.

Replacement Considerations

Direct functional equivalents are found within the 1N6309US through 1N6355US series. For identical specifications, verify the replacement part number includes the correct suffix indicating the desired voltage tolerance and reliability level (e.g., JAN, JANTX).