1N4943

Overview

The Microchip Technology 1N4943 is a single Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 16 V with a tolerance of 5%. The device operates at a test current of 16 mA and dissipates up to 500 mW of power. It utilizes an axial leaded DO-204AH (DO-41) package, suitable for through-hole mounting. The component maintains stable performance across a wide temperature range from -65 °C to +175 °C, ensuring reliability in demanding environments.

Feature Summary

• Provides precise voltage regulation with a nominal 16 V Zener potential
• Supports high-temperature operation up to 175 °C junction temperature
• Utilizes standard axial through-hole packaging for easy integration

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection stages in power supplies
• Clamping applications in signal processing paths

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official 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 component marking with the official Microchip Technology documentation to authenticate the source and prevent counterfeit components.

Selection Notes

Select this component when a 16 V regulation point is required within a standard axial form factor. Consider the 500 mW power rating and the maximum reverse leakage current specifications relative to the load requirements. Evaluate the thermal management needs given the extended operating temperature range to ensure long-term stability under continuous bias conditions.

Part Context

This part belongs to the standard 1N49xx series of glass-passivated Zener diodes manufactured by Microchip Technology. These devices are widely recognized for their robust construction and consistent performance in general-purpose electronic equipment. The series offers various voltage ratings while maintaining uniform physical dimensions and mounting characteristics for design flexibility.

Replacement Considerations

Compatible substitutes include the 1N4943A from other manufacturers or equivalent parts within the 1N47xx series if voltage alignment permits. Verify that any replacement maintains the same DO-204AH package outline and meets the 500 mW power dissipation requirement.