1N4770A

Overview

The 1N4770A is a silicon Zener diode manufactured by Microchip Technology, designed for voltage regulation and reference applications. It features a nominal Zener voltage of 9.1 V with a tolerance of ±5%. The device operates in the DO-35 axial through-hole package and supports a maximum power dissipation of 0.5 W. Key electrical characteristics include a reverse leakage current of 10 µA at 25°C and a temperature coefficient of 0.91 mV/°C. It is rated for an operating temperature range from -65°C to +175°C.

Feature Summary

• Temperature compensated design for stable voltage reference performance across wide thermal ranges
• Metallurgically bonded construction with double plug technology for enhanced reliability
• Low current operation optimized for test currents around 1 mA

Applications

• Precision voltage reference circuits requiring low current stability
• Overvoltage protection in sensitive electronic systems
• Voltage regulator designs within low-power analog signal chains

Procurement Notes

Verify compliance requirements as the component is marked non-RoHS compliant. Confirm that the specific ordering suffix matches the required package and tolerance specifications. Ensure the procurement channel provides valid traceability documentation for military or industrial grade parts. Check for any recent Product Change Notifications regarding assembly sites or labeling updates before finalizing orders.

Selection Notes

Select this component when a stable 9.1 V reference is needed in a compact axial package. The low test current requirement makes it suitable for battery-powered or energy-efficient designs. Consider the positive temperature coefficient for compensation needs in higher voltage references. Verify that the 0.5 W power rating meets the thermal dissipation requirements of the target application environment.

Part Context

This part belongs to the 1N47xx series of Zener diodes produced by Microchip Technology. The series includes various voltage ratings ranging from low to high values, all sharing similar metallurgical bonding and double plug construction techniques. These components are widely used in general-purpose electronics where reliable voltage clamping and regulation are essential.

Replacement Considerations

Direct substitutes within the same family include 1N4770 and 1N4770A-1. Cross-manufacturer equivalents must match the 9.1 V Zener voltage, 0.5 W power rating, and DO-35 package dimensions. Verify that alternative sources maintain the same temperature coefficient and leakage current specifications.