1N4559A

Single Zener Diodes Overview

The Microchip Technology 1N4559A is a unidirectional voltage regulator diode constructed from silicon. It features a nominal Zener voltage of 4.7 V and a power dissipation rating of 50 W. The device utilizes a metal TO-204AD (DO-5) through-hole package with two terminals. It operates within a temperature range of -65 °C to +175 °C. Key electrical characteristics include a maximum dynamic impedance of 0.12 Ω and a knee impedance of 600 Ω.

Single Zener Diodes Feature Summary

• High-power voltage regulation capability for robust circuit protection
• Wide operating temperature range suitable for demanding environments
• Metal case construction providing thermal stability

Single Zener Diodes Applications

• High-power voltage reference circuits
• Overvoltage protection in industrial systems
• Power supply regulation modules

Single Zener Diodes Procurement Notes

Verify the manufacturer source, as historical data indicates production by Motorola/NXP and current listings by Microchip. Confirm RoHS compliance status, as some records indicate non-compliance. Ensure the specific package variant matches the required mechanical footprint for the application.

Single Zener Diodes Selection Notes

Select this component for applications requiring high power handling at low voltage levels. The TO-204AD package offers superior thermal performance compared to smaller packages. Consider the 0.12 Ω dynamic impedance for precision regulation needs. Verify lead availability given potential legacy manufacturing transitions.

Single Zener Diodes Part Context

This part belongs to the standard Zener diode family used for voltage stabilization. It serves as a high-power alternative to lower-wattage planar devices. The TO-204AD package is a traditional axial leaded form factor often found in legacy or heavy-duty industrial designs.

Single Zener Diodes Replacement Considerations

Check for direct equivalents such as the 1N4559B if tighter tolerance is required. Verify pinout compatibility when substituting with other 50 W Zener diodes in the TO-204AD package.