1N6331

Overview

The Microchip Technology 1N6331 is a military-qualified Zener voltage regulator featuring a voidless hermetically sealed glass package. It provides a nominal Zener voltage of 20 V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and dissipates up to 0.5 W at a lead temperature of 75°C. Key electrical characteristics include a maximum dynamic impedance of 18 ohms, a reverse leakage current of 10 µA at 15 V, and a forward voltage of 1.4 V at 1 A.

Feature Summary

• Hermetically sealed construction using voidless hard glass with tungsten slugs for high-reliability environments.
• Internal metallurgical bonds categorized as Category III for robust mechanical integrity.
• Inherently radiation hard and non-sensitive to electrostatic discharge (ESD).
• Flexible axial-lead mounting terminals suitable for through-hole applications.

Applications

• High-reliability military and aerospace circuits where failure cannot be tolerated.
• Voltage regulation over broad operating current and temperature ranges.
• Radiation-hardened electronic systems.

Procurement Notes

Verify the specific reliability level required, such as JAN, JANTX, JANTXV, or JANS, as these designations dictate qualification per MIL-PRF-19500/533. Confirm RoHS compliance status, noting that compliant versions are available only in commercial grades. Ensure the ordering suffix matches the desired voltage tolerance and packaging configuration before finalizing procurement.

Selection Notes

Select this component when a 20 V reference is needed in a DO-35 axial package. Consider the thermal resistance values of 150 °C/W (junction-to-lead) and 240 °C/W (junction-to-ambient) for power derating calculations. Verify that the application environment supports the specified operating temperature range and that the package polarity marking aligns with the circuit layout requirements.

Part Context

This part belongs to the 1N6309 through 1N6355 series of industry-recognized 0.5 watt Zener voltage regulators. The series offers selections from 2.4 to 200 volts with various tolerance options. While primarily known in the DO-35 package, surface-mount equivalents are also available in the B SQ MELF package format.

Replacement Considerations

Public confirmed substitute part numbers include JAN1N6331C, JAN1N6331D, JANS1N6331C, and JANTX1N6331C.

FAQ

What is the internal bond category for the 1N6331?

The 1N6331 utilizes Category III internal metallurgical bonds.

Is the 1N6331 sensitive to electrostatic discharge?

No, the device is non-sensitive to ESD per MIL-STD-750 method 1020.