1N4780C

Overview

The 1N4780C is a silicon voltage reference diode manufactured by Microchip Technology. It provides a nominal reference voltage of 8.5 V with a maximum power dissipation of 0.4 W. The device operates within an extended temperature range from -65 °C to +175 °C and features a glass axial package (DO-7). Key electrical characteristics include a maximum reverse leakage current of 10 µA, a Zener impedance of 100 Ohms, and a test current of 1 mA. The component is designed for applications requiring stable voltage regulation under varying thermal conditions.

Feature Summary

• Temperature compensated design for stable voltage reference performance across wide thermal ranges
• Glass axial encapsulation providing isolation and robust physical protection
• High reliability construction suitable for demanding operational environments

Applications

• Precision voltage reference circuits
• Temperature compensated regulator designs
• Industrial control systems requiring stable bias voltages

Procurement Notes

Verify the specific suffix 'C' against official Microchip documentation to confirm exact tolerance and screening levels, as suffixes often denote specific manufacturing variants or quality grades. Ensure the procurement channel sources directly from authorized distributors to guarantee authenticity and traceability. Cross-reference the datasheet revision date to ensure compliance with current specifications.

Selection Notes

Select this component when an 8.5 V reference is required in a low-power, through-hole configuration. The 0.4 W power rating limits its use in high-current scenarios. Consider the DO-7 package dimensions for PCB layout constraints. Evaluate the -65 °C to +175 °C operating range against the specific environmental demands of the target application to ensure long-term stability.

Part Context

This part belongs to the broader family of Zener voltage reference diodes produced by Microchip Technology. These components are widely used in analog signal processing and power management circuits where precise voltage levels are critical. The 1N4780 series typically offers various voltage options within the same package style, allowing designers to standardize on a single footprint for different reference requirements.

Replacement Considerations

Direct substitutes may include other 8.5 V Zener diodes in DO-7 packages from manufacturers like STMicroelectronics or ON Semiconductor, provided they meet the 0.4 W power dissipation and temperature range specifications. Verify pinout compatibility and electrical parameters such as impedance and leakage current before substitution.