1N4129

Single Zener Diodes Overview

The Microchip Technology 1N4129 is a 500 mW metallurgically bonded glass Zener diode with a nominal voltage of 62 V. It operates within a junction temperature range of -65 °C to +175 °C and features a maximum reverse current of 47.1 µA at the specified test voltage. The device exhibits a maximum dynamic impedance of 500 Ohms and a noise density of 40 µV/√Hz at the test current. Standard tolerance is ±5%, with optional tighter tolerances available through specific ordering suffixes.

Single Zener Diodes Feature Summary

• Hermetically sealed axial-lead glass DO-35 package with internal metallurgical bond
• Qualified per MIL-PRF-19500/435 for JAN, JANTX, JANTXV, and JANS reliability levels
• Inherently radiation hard as described in Microsemi MicroNote 050
• Non-sensitive to electrostatic discharge per MIL-STD-750 method 1020

Single Zener Diodes Applications

• Voltage regulation over broad ranges of current and temperature
• High reliability applications requiring military qualification
• Radiation-hardened electronic systems

Single Zener Diodes Procurement Notes

Verify the required reliability level (JAN, JANTX, JANTXV, or JANS) and voltage tolerance (standard 5%, 2%, or 1%) when placing orders. Confirm RoHS compliance requirements, noting that compliant versions are available only on commercial grade parts. Ensure the correct package style (DO-35 axial lead or surface mount variants) is selected based on the design specifications.

Single Zener Diodes Selection Notes

Select the 1N4129 for circuits requiring stable voltage reference at 62 V with high thermal stability. Consider the positive temperature coefficient above 5 V for precision applications. Evaluate the maximum power dissipation derating curve for ambient operating conditions. Verify that the low capacitance characteristics meet the signal integrity requirements of the target application.

Single Zener Diodes Part Context

The 1N4129 belongs to the 1N4099-1 through 1N4135-1 series of 500 mZener diodes manufactured by Microchip Technology. These components are JEDEC registered and designed for robust performance in demanding environments. The series offers extensive voltage selection from 1.8 to 100 V with various tolerance options to suit diverse circuit needs.

Single Zener Diodes Replacement Considerations

Direct substitutes include other 1N4129 variants with different reliability suffixes such as JANS1N4129-1 or JANTX1N4129-1. Surface mount equivalents like 1N4129UR-1 are available in the DO-213AA package. Cross-reference electrical parameters carefully to ensure compatibility with existing board designs.