1N4780A

Overview

The Microchip Technology 1N4780A is a temperature-compensated Zener diode designed for precision voltage reference applications. It features a nominal Zener voltage of 8.5 V with a tight tolerance of ±1%. The device operates in the DO-35-2 axial through-hole package and dissipates up to 500 mW. Key electrical characteristics include a maximum reverse leakage current of 2 µA, a Zener impedance of 25 Ω at a test current of 4 mA, and an operating temperature range from -65°C to +175°C.

Feature Summary

• Temperature compensated design ensures stable voltage regulation across wide thermal variations
• High precision voltage reference capability with tight manufacturing tolerances
• Robust glass passivated junction construction suitable for harsh environments

Applications

• Precision voltage reference circuits requiring low drift
• Temperature compensation networks in analog systems
• High-reliability industrial control equipment

Procurement Notes

Verify the specific suffix designation when ordering, as it may indicate packaging or compliance variations. Confirm that the required voltage tolerance and power dissipation ratings align with your circuit design constraints. Ensure the DO-35-2 package dimensions fit your PCB layout. Check for RoHS compliance status if environmental regulations apply to your project.

Selection Notes

Select this component when a stable 8.5 V reference is needed with minimal temperature coefficient. Compare against standard Zener diodes if high precision is not critical, as alternatives may offer lower costs. Consider the 500 mW power rating to ensure adequate thermal headroom in your application environment.

Part Context

This part belongs to the Microchip 1N4780 series of temperature-compensated Zener diodes. These devices are engineered to provide superior stability compared to standard Zener diodes by utilizing a combination of Zener and avalanche breakdown mechanisms. The series is commonly used in instrumentation and measurement applications where accuracy is paramount.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.