1N4121-1

Single Zener Diodes Overview

The Microchip Technology 1N4121-1 is a 500 mW metallurgically bonded glass Zener diode in the axial-lead DO-35 package. It provides a nominal Zener voltage of 33 V at a test current of 250 µA, with a maximum dynamic impedance of 0.01 Ohms and a reverse leakage current of 40 µA. The device operates within a junction temperature range of -65 °C to +175 °C and features a maximum noise density of 1 µV/√Hz.

Single Zener Diodes Feature Summary

• Internal metallurgical bond construction for high reliability
• Qualified per MIL-PRF-19500/435 for JAN, JANTX, JANTXV, and JANS levels
• Hermetically sealed glass DO-35 package
• Inherently radiation hard

Single Zener Diodes Applications

• High-reliability voltage regulation
• Military and aerospace circuits
• Harsh environment power supplies

Single Zener Diodes Procurement Notes

Verify the specific qualification level (JAN, JANTX, JANTXV, or JANS) required for your application, as this affects performance and availability. Confirm RoHS compliance status if applicable, noting that commercial versions may differ from military grades. Ensure the ordering suffix matches the desired tolerance and packaging configuration before finalizing procurement.

Single Zener Diodes Selection Notes

Select the 1N4121-1 when a precise 33 V reference is needed in a ruggedized axial-lead package. Consider the low dynamic impedance for stable regulation under varying load conditions. Evaluate the thermal derating curve to ensure adequate heat dissipation at elevated ambient temperatures, particularly near the upper operating limit.

Single Zener Diodes Part Context

This component belongs to the 1N4099-1 through 1N4135-1 series of 500 mZener diodes. These devices are JEDEC registered and offer a wide voltage range from 1.8 V to 100 V. The series is designed for applications requiring robust performance and is available in various surface mount packages alongside the standard axial lead option.

Single Zener Diodes Replacement Considerations

Compatible substitutes include other 1N4121 variants from different manufacturers that meet the same electrical specifications and MIL-PRF-19500/435 qualification standards. Verify pinout compatibility and package dimensions to ensure mechanical fit within existing designs.