1N4621

Single Zener Diodes Overview

The Microchip Technology 1N4621 is a Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 5.6 V with a power dissipation rating of 500 mW. The device is available in the DO-35 axial through-hole package and offers a standard voltage tolerance of ±5%. It operates within a temperature range of -65 °C to +175 °C junction temperature. Key electrical characteristics include a maximum reverse leakage current of 5 µA at 3 V and a maximum impedance of 1500 Ohms.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation using silicon Zener breakdown technology
• Constructed with an internal metallurgical bond for high reliability
• Hermetically sealed glass encapsulation suitable for harsh environments
• Qualified for military standards including JANS level performance

Single Zener Diodes Applications

• High-reliability aerospace voltage reference circuits
• Military-grade power supply protection stages
• Precision instrumentation voltage clamping
• Harsh environment signal conditioning

Single Zener Diodes Procurement Notes

Verify the specific suffix (e.g., UR-1E3) to confirm hermetic sealing and MIL-PRF-19500/435 qualification levels. Ensure the required tolerance matches the available options, as tighter tolerances may require specific variants. Confirm RoHS compliance status if applicable to the specific manufacturing lot. Validate that the DO-213AA or DO-35 package form factor aligns with the target PCB layout requirements.

Single Zener Diodes Selection Notes

Select this component when high reliability and radiation hardness are critical. The 500 mW rating supports moderate current loads. Verify the operating temperature range meets system extremes. Consider the metallurgical bond construction for superior thermal cycling resistance compared to standard commercial equivalents. Ensure the 5.6 V Zener voltage aligns with the circuit design specifications.

Single Zener Diodes Part Context

This part belongs to the 1N4614 through 1N4627 series of surface mount and through-hole Zener diodes manufactured by Microchip. These devices are engineered for demanding applications requiring consistent voltage regulation. The series utilizes advanced glass passivation techniques to ensure long-term stability and low leakage currents under varying environmental conditions.

Single Zener Diodes Replacement Considerations

Public confirmed substitute part numbers: 1N4621DUR-1E3, JAN1N4621.