1N4747

Overview

The Microchip Technology 1N4747 is a silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 20 V with a standard tolerance of 5%. The device supports a power dissipation of 1 W and operates within an extended temperature range from -65 °C to +175 °C. Key electrical characteristics include a maximum reverse leakage current of 100 nA and a Zener impedance of 22 Ohms at the test current of 12.5 mA. The component is available in various packages, including axial DO-41 and hermetic MELF DO-213AB configurations.

Feature Summary

• Provides stable voltage regulation with a 20 V nominal breakdown voltage.
• Capable of handling 1 W power dissipation for robust performance.
• Engineered for high-temperature operation up to 175 °C.
• Offers low reverse leakage current for efficient circuit isolation.

Applications

• Voltage reference circuits requiring precise potential levels
• Overvoltage protection stages in sensitive electronics
• Power supply regulation modules

Procurement Notes

Verify the specific suffix (e.g., AG, AUR) to confirm package type and tolerance accuracy. Confirm RoHS compliance status as it varies by variant. Check manufacturer documentation for lead time requirements and minimum order quantities associated with reel or bulk packaging options.

Selection Notes

Select the appropriate package based on board space and mounting constraints. Ensure the thermal environment supports the 175 °C maximum junction temperature rating. Verify that the load current does not exceed the diode's power dissipation limits under worst-case conditions.

Part Context

This component belongs to the 1N47xx series of Zener diodes manufactured by Microchip Technology. The series offers a wide range of voltage values and power ratings. The 1N4747 specifically addresses the 20 V requirement within the 1 W power class, serving as a reliable alternative to legacy equivalents in industrial and commercial designs.

Replacement Considerations

Cross-reference with other manufacturers' 1N4747 parts ensuring identical 20 V Zener voltage, 1 W power rating, and compatible package dimensions. Verify matching electrical parameters such as impedance and leakage current before substitution.