1N4621-1/TR

Single Zener Diodes Overview

The Microchip Technology 1N4621-1/TR is a 500 mW Zener voltage regulator featuring an internal metallurgical bond and hermetically sealed glass DO-35 (DO-204AH) axial-lead package. It provides a nominal Zener voltage of 3.6 V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65 °C to +175 °C, includes a maximum reverse current of 2.0 µA at 3 V, and exhibits a maximum noise density of 3.5 µV/√Hz.

Single Zener Diodes Feature Summary

• Hermetically sealed construction utilizing an internal metallurgical bond for high reliability
• Qualified per MIL-PRF-19500/435 standards for JAN, JANTX, JANTXV, and JANS levels
• Low noise density performance suitable for sensitive analog applications
• Flexible axial-lead mounting terminals compatible with standard through-hole processes

Single Zener Diodes Applications

• High-reliability voltage regulation in aerospace systems
• Reference voltage sources for precision instrumentation
• Overvoltage protection circuits in military-grade electronics
• Temperature-compensated bias networks

Single Zener Diodes Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for the application, as the base part number covers multiple qualification tiers. Confirm RoHS compliance status if environmental regulations apply, noting that RoHS versions are typically commercial grade only. Ensure the tape and reel packaging matches automated assembly requirements.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed, radiation-hardened Zener diode is necessary for harsh environments. The 3.6 V output is appropriate for low-voltage reference applications requiring tight tolerance. Consider the thermal derating curve for power dissipation limits above 25 °C lead temperature. Verify that the axial-lead form factor fits the PCB layout constraints.

Single Zener Diodes Part Context

This device belongs to the 1N4614-1 through 1N4627-1 series of 500 mW metallurgically bonded glass Zener diodes. The series offers voltages from 1.8 V to 100 V with various tolerance options. The 1N4621-1 variant specifically targets the 3.6 V segment, providing a stable breakdown voltage for precision regulation tasks in demanding operational conditions.

Single Zener Diodes Replacement Considerations

Direct substitutes include other parts within the 1N4614-1 to 1N4627-1 series from Microsemi/Microchip. Cross-brand replacements must match the 3.6 V nominal voltage, 500 mW power rating, DO-35 package, and MIL-PRF-19500/435 qualification level.