1N4121

Single Zener Diodes Overview

The Microchip Technology 1N4121-1 is a 500 mW metallurgically bonded glass Zener diode in an axial-lead DO-35 package. It provides a nominal Zener voltage of 33 V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65 °C to +175 °C and features a maximum reverse leakage current of 25 µA at the specified voltage. Electrical characteristics include a test current (IZT) of 250 µA, a dynamic impedance (ZZT) of 0.01 Ohms, and a maximum noise density of 25.1 µV/√Hz.

Single Zener Diodes Feature Summary

• Constructed with an internal metallurgical bond for high reliability.
• Qualified per MIL-PRF-19500/435 for military applications.
• Hermetically sealed glass DO-35 package design.

Single Zener Diodes Applications

• High-reliability voltage regulation circuits
• Military-grade electronic systems
• Temperature-compensated reference designs

Single Zener Diodes Procurement Notes

Verify the specific reliability level required, as the part number suffix indicates qualification status. Confirm RoHS compliance requirements, noting that compliant versions are available only on commercial grades. Ensure the ordering suffix matches the desired tolerance and packaging configuration before finalizing procurement.

Single Zener Diodes Selection Notes

Select this component for applications requiring stable voltage regulation across wide temperature ranges. The low dynamic impedance supports precise regulation needs. Consider the thermal resistance and power derating curves when designing for ambient conditions exceeding 25 °C to ensure safe operation within the 500 mW rating.

Single Zener Diodes Part Context

This component belongs to the 1N4099-1 through 1N4135-1 series of 500 mZener diodes. These devices share common construction methods and package styles but vary in nominal breakdown voltage from 1.8 V to 100 V. The series offers multiple tolerance options including 5%, 2%, and 1% variants.

Single Zener Diodes Replacement Considerations

Compatible substitutes include other 1N4121-1 variants with different reliability suffixes such as JANTX or JANS. Commercial grade equivalents without military qualification may also serve as alternatives if environmental ratings permit.