1N4123UR/TR

Single Zener Diodes Overview

The Microchip Technology 1N4123UR/TR is a 0.5-watt glass surface mount Zener voltage regulator in the DO-213AA package. It provides a nominal Zener voltage of 39V with standard ±5% tolerance at a test current of 250µA. The device features a maximum Zener impedance of 0.01 ohms and a maximum reverse leakage current of 2µA. It operates within a temperature range of -65°C to +175°C and includes a tape-and-reel packaging option.

Single Zener Diodes Feature Summary

• Hermetically sealed glass DO-213AA MELF-style surface mount package
• Internal metallurgical bond construction for high reliability
• Minimal capacitance characteristics suitable for sensitive circuits
• Inherently radiation hard design

Single Zener Diodes Applications

• Voltage regulation in broad operating current ranges
• High reliability electronic systems requiring hermetic sealing
• Radiation-hardened circuit designs

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required electrical parameters, particularly the 39V nominal voltage and 0.5W power rating. Confirm the presence of the TR suffix indicates tape-and-reel packaging rather than bulk. Ensure the manufacturer designation aligns with current Microchip Technology specifications.

Single Zener Diodes Selection Notes

Select this component when a surface mount equivalent to axial-leaded 1N4123 is required. Consider the tight Zener impedance and low noise density for precision applications. Verify thermal derating requirements against the FR4 PCB footprint specifications provided in the datasheet.

Single Zener Diodes Part Context

This device belongs to the 1N4099UR through 1N4135UR series of 0.5-watt Zener diodes. These components serve as surface mount replacements for JEDEC registered axial-leaded counterparts. The series offers voltages from 1.8 to 100V with various tolerance options.

Single Zener Diodes Replacement Considerations

Direct surface mount equivalents include the MLL4123 variant. For axial leaded replacements, the standard 1N4123 is the corresponding industry part number. Military qualified versions are available with different suffixes.