1N4773A

Overview

The Microchip Technology 1N4773A is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 9.1 V with a tolerance of ±5%. The device operates in the DO-204AA (DO-35) axial through-hole package, dissipating up to 500 mW of power. Key electrical parameters include a maximum reverse leakage current of 10 µA and a Zener impedance of 200 Ohms at a test current of 1 mA. It supports an operating temperature range from -65°C to +175°C.

Feature Summary

• Temperature compensated design for stable voltage regulation across wide thermal ranges
• Single unidirectional configuration for standard circuit integration
• Robust axial leaded construction suitable for through-hole mounting

Applications

• Precision voltage reference circuits
• Over-voltage protection stages
• General-purpose voltage regulation

Procurement Notes

Verify the specific suffix designation against official Microchip documentation, as the provided model lacks the trailing character found in some distributor listings. Confirm RoHS compliance status directly with the manufacturer, as historical data indicates non-compliance for this series. Ensure the procurement channel sources genuine components to guarantee the specified electrical tolerances and temperature coefficients are met.

Selection Notes

Select this component when a 9.1 V regulated supply is required in a low-power through-hole environment. The 500 mW power rating limits suitability for high-current applications. Consider the 200 Ohm impedance value for noise-sensitive designs. Verify that the axial package dimensions fit the target PCB layout constraints compared to surface-mount alternatives.

Part Context

This part belongs to the standard 1N47xx series of Zener diodes manufactured by Microchip Technology. These devices are widely recognized for their reliability in industrial and commercial electronics. The 1N4773A specifically addresses the need for a 9.1 V reference point within the broader family of available voltages ranging from lower values up to higher breakdown thresholds.

Replacement Considerations

Cross-reference with other manufacturers offering 1N4773 equivalents. Verify pinout compatibility and package dimensions before substitution. Ensure replacement parts meet the same 500 mW power dissipation and 9.1 V nominal voltage specifications.