1N4971

Single Zener Diodes Overview

The Microchip Technology 1N4971 is a military-qualified, voidless hermetically sealed glass Zener diode designed for high-reliability applications. It features a nominal Zener voltage of 36 V at a test current of 30 mA with a standard tolerance of ±5%. The device dissipates 5 Watts at a lead temperature of 65°C and operates within a junction temperature range of -65°C to +175°C. Key electrical characteristics include a maximum reverse leakage current of 2 µA at 27.4 V, a dynamic impedance of 11 Ohms at the test current, and a positive temperature coefficient of 0.095 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using voidless hard glass with tungsten slugs and internal metallurgical bonds.
• Military qualification compliant with MIL-PRF-19500/356 standards.
• Inherently radiation hard and non-sensitive to electrostatic discharge (ESD).
• Triple-layer passivation provides robust protection against environmental stress.

Single Zener Diodes Applications

• High-reliability aerospace and defense circuits where failure cannot be tolerated.
• Voltage regulation in harsh environments requiring extended temperature performance.
• Critical power management systems utilizing broad operating current ranges.

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required military qualification level and package style. Confirm compliance with MIL-PRF-19500/356 specifications if mission-critical reliability is required. Ensure the ordering suffix aligns with the desired tolerance or surface-mount variant, as these affect physical dimensions and electrical parameters. Check for RoHS status restrictions if applicable to the target assembly process.

Single Zener Diodes Selection Notes

Select this component when a 5 Watt axial-lead Zener diode with strict military reliability standards is necessary. The 36 V rating suits applications requiring stable reference voltages under varying thermal conditions. Consider the positive temperature coefficient for designs needing predictable voltage drift. Evaluate the surge current capability against transient load requirements to ensure adequate safety margins during peak operations.

Single Zener Diodes Part Context

This device belongs to the 1N4954 through 1N4996 series of 5 Watt Zener Voltage Regulators manufactured by Microsemi's Scottsdale Division. The series offers extensive voltage selections from 3.3 to 390 Volts with standard 5% tolerances. Surface-mount equivalents are available in square end-cap MELF configurations with 'US' suffixes. The family is recognized for its robust construction and wide availability in both through-hole and SMT formats.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 36 V Zener voltage, 5 W power dissipation, and axial leaded package. Verify that substitute components meet the same MIL-PRF-19500/356 military qualification if radiation hardness or extreme temperature operation is required. Ensure equivalent leakage current and impedance specifications to maintain circuit stability.