1N4777A

Overview

The Microchip Technology 1N4777A is a temperature-compensated Zener diode with a nominal voltage of 8.5 V and ±5% tolerance. It features a power dissipation rating of 500 mW and operates within a junction temperature range of -65 °C to +175 °C. The component utilizes a DO-35 axial leaded package, ensuring reliable performance in precision voltage regulation applications requiring stable characteristics across varying thermal conditions.

Feature Summary

• Temperature compensated design for enhanced voltage stability
• High operating junction temperature capability up to 175 °C
• Precision voltage regulation with tight tolerance

Applications

• Precision voltage reference circuits
• Temperature-stable regulator designs
• Overvoltage protection in sensitive electronics

Procurement Notes

Verify the specific suffix (e.g., /TR) against the required packaging format, as standard units differ from tape-and-reel variants. Confirm RoHS compliance status directly with the manufacturer documentation, as indicated by available data sources. Ensure the DO-35 package matches the target PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when precise voltage regulation under varying thermal conditions is critical. The temperature compensation feature distinguishes it from standard Zener diodes, making it suitable for high-reliability environments. Verify that the 500 mW power rating aligns with the expected current draw in the specific circuit application to prevent thermal overload.

Part Context

This device belongs to the 1N47xx series of Zener diodes manufactured by Microchip Technology. The series offers various voltage options, with the 1N4777A specifically providing an 8.5 V breakdown voltage. It is designed for general-purpose and specialized voltage regulation tasks where stability is prioritized over cost.

Replacement Considerations

Cross-reference with other manufacturers' 8.5 V temperature-compensated Zener diodes in the DO-35 package. Ensure equivalent power ratings and thermal characteristics are met. Verify pinout compatibility if substituting with non-standard packages.