1N4777

Overview

The Microchip Technology 1N4777 is a single Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 30 V with a 5% tolerance and operates within a wide temperature range from -65 °C to +175 °C. The device utilizes an axial DO-41 package, supporting through-hole mounting. It dissipates up to 1 W of power at rated conditions, with a maximum reverse leakage current of 50 nA and a Zener impedance of 20 Ohms. The component is configured as a single unit and is suitable for general-purpose regulation tasks.

Feature Summary

• Provides stable voltage regulation with a nominal 30 V output
• Operates reliably across extended industrial temperature ranges
• Utilizes a robust glass passivated junction for durability

Applications

• General-purpose voltage reference circuits
• Overvoltage protection in power supplies
• Biasing networks in analog signal processing

Procurement Notes

Verify the specific suffix code on the datasheet to confirm exact electrical tolerances and packaging options. Ensure the selected variant matches the required thermal dissipation capabilities for the intended circuit design. Cross-reference the manufacturer's latest documentation to confirm compliance with current environmental standards before finalizing procurement specifications.

Selection Notes

Select this component when a standard 30 V regulation point is required in through-hole designs. Consider the 1 W power rating and thermal resistance when determining heat sinking needs. Verify that the 5% voltage tolerance aligns with the precision requirements of the target application compared to tighter tolerance alternatives.

Part Context

This part belongs to the standard 1N47xx series of Zener diodes manufactured by Microchip Technology. These components are widely used in electronic circuits requiring reliable voltage clamping or reference levels. The 1N4777 specifically addresses the common need for a 30 V regulation point in legacy and modern through-hole PCB layouts.

Replacement Considerations

Equivalent parts include the 1N4777A from other manufacturers offering identical 30 V specifications. Verify pinout compatibility and package dimensions (DO-41) before substitution. Ensure replacement devices meet the same 1 W power dissipation and temperature range requirements.