1N4747AUR

Overview

The Microchip Technology 1N4747AUR is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 20 V with a tolerance of 5%. The device operates in the SMD/SMT configuration within a DO-213AB-2 package, also known as MELF-2. It supports a power dissipation of 1 W and maintains a maximum reverse leakage current of 100 nA at the test current of 12.5 mA. The unit exhibits a Zener impedance of 22 Ohms and functions reliably across an extended temperature range from -65 C to +175 C.

Feature Summary

• Hermetically sealed glass MELF construction for high reliability
• Extended operating temperature range suitable for harsh environments
• Low leakage current characteristics for stable regulation

Applications

• Voltage reference circuits
• Overvoltage protection systems
• Power supply regulation

Procurement Notes

Verify component authenticity through authorized Microchip distributors or certified suppliers. Confirm that the received parts match the specific DO-213AB-2 package dimensions and marking codes. Ensure storage conditions comply with manufacturer guidelines to maintain hermetic seal integrity. Request batch-specific documentation to validate compliance with relevant quality standards before integration into production.

Selection Notes

Select this component when a precise 20 V regulation point is required in surface-mount designs. The 1 W power rating allows for robust performance in moderate current scenarios. Consider the low leakage specification for sensitive analog sections. The wide thermal range makes it appropriate for industrial or automotive contexts where standard commercial grades may fail.

Part Context

This part belongs to the standard 1N47xx series of Zener diodes manufactured by Microchip Technology. The 'AUR' suffix typically denotes the specific tape-and-reel or bulk packaging variant within the MELF form factor. It serves as a direct replacement for legacy through-hole equivalents in modern compact PCB layouts requiring hermetic sealing.

Replacement Considerations

Direct substitutes include other manufacturers' 1N4747A variants in DO-213AB packages. Verify pinout compatibility and thermal resistance values when cross-referencing with alternative brands. Ensure the replacement maintains the same 20 V nominal voltage and 5% tolerance to preserve circuit functionality.