1N3994A

Single Zener Diodes Overview

The 1N3994A is a high-power silicon Zener diode manufactured by Microchip Technology, formerly Motorola. It features a nominal Zener voltage of 4.3V with a tolerance of 5%. The device is designed for stud-mount installation in a DO-4 metal package, providing a maximum power dissipation of 10W. It operates within a temperature range of -65°C to +175°C and exhibits a maximum dynamic impedance of 1.5Ω.

Single Zener Diodes Feature Summary

• High power handling capability with 10W dissipation rating
• Robust metal DO-4 stud-mount construction for thermal efficiency
• Wide operating temperature range suitable for harsh environments

Single Zener Diodes Applications

• High-power voltage regulation circuits
• Industrial power supply protection
• Overvoltage clamping in heavy-duty equipment

Single Zener Diodes Procurement Notes

Verify the manufacturer origin carefully, as this component was originally produced by Motorola before NXP acquisition and is now listed under Microchip Technology. Confirm the specific datasheet version and revision history to ensure compliance with current manufacturing standards. Check for any product change notifications that may affect pinout or material composition prior to final design integration.

Single Zener Diodes Selection Notes

Select this component when high current handling and robust mechanical mounting are required. The DO-4 package facilitates direct heatsinking via the stud terminal. Ensure the circuit design accounts for the 10W power dissipation limits and the specific 4.3V breakdown characteristic. Verify thermal management strategies align with the maximum junction temperature specifications provided in the official documentation.

Single Zener Diodes Part Context

This part belongs to the legacy Motorola Zener diode series, now maintained by Microchip Technology. It represents a standard high-power discrete semiconductor solution. The DO-4 package is a traditional form factor often used in industrial and military applications requiring durable, high-wattage voltage reference components.

Single Zener Diodes Replacement Considerations

Cross-reference with other 10W, 4.3V Zener diodes in DO-4 packages from qualified manufacturers. Ensure electrical parameters such as dynamic impedance and leakage current match the original specifications. Verify mechanical compatibility of the stud mount configuration.