1N4121UR/TR

Single Zener Diodes Overview

The Microchip Technology 1N4121UR/TR is a glass surface mount Zener voltage regulator with a nominal breakdown voltage of 33 V. It operates within the 1N4099UR through 1N4135UR series and utilizes a DO-213AA (SOD80/MLL34) MELF package. The device provides a maximum Zener impedance of 0.01 Ohms at a test current of 250 µA, with a maximum reverse leakage current of 40 µA. It supports a steady-state power dissipation of 0.5 W and functions across an operating temperature range from -65°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass DO-213AA MELF package
• Inherently radiation hard construction
• ESD nonsensitive per MIL-STD-750 Method 1020
• Minimal capacitance characteristics

Single Zener Diodes Applications

• Voltage regulation in harsh environments
• Radiation-hardened circuit designs
• Precision reference applications requiring low noise

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix against official documentation to confirm compliance requirements. Confirm that the TR suffix indicates tape and reel packaging as specified in the datasheet. Ensure the component meets the required thermal resistance and power derating specifications for the intended application environment.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed surface mount Zener diode is required for high-reliability applications. The 33 V rating and tight impedance make it suitable for precision regulation. Consider the radiation hardness and ESD robustness for aerospace or industrial use cases where standard packages may be insufficient.

Single Zener Diodes Part Context

This part belongs to the Microsemi Scottsdale Division 1N4099UR through 1N4135UR series of 0.5 Watt glass surface mount Zeners. These devices serve as surface mount equivalents to JEDEC registered axial-leaded parts. The series offers voltages from 1.8 to 100 V with standard 5% tolerances.

Single Zener Diodes Replacement Considerations

JEDEC registered 1N4099 thru 1N4135 series axial-leaded equivalents are available. MLL4099 thru MLL4135 part numbers correspond to this series.