1N2809B

Overview

The 1N2809B is a single silicon Zener diode manufactured by Microchip Technology, designed for voltage regulation applications. It features a nominal Zener voltage of 11V and a power dissipation rating of 50W. The device utilizes the TO-204AD axial leaded package, suitable for through-hole mounting. Key electrical characteristics include a maximum Zener impedance of 0.8 Ohms and a leakage current of 10uA at the rated voltage. This component serves as a robust voltage reference or regulator in high-power circuits.

Feature Summary

• Provides stable 11V voltage regulation with 50W power handling capability
• Utilizes TO-204AD axial leaded package for through-hole integration
• Features low Zener impedance of 0.8 Ohms for precise regulation

Applications

• High-power voltage regulation circuits
• Voltage reference sources in industrial equipment
• Overvoltage protection in power supplies

Procurement Notes

Verify the manufacturer designation, as historical production may involve Microsemi Corporation prior to acquisition. Confirm RoHS compliance status, as this specific part number is often listed as non-compliant due to legacy manufacturing processes. Ensure the TO-204AD package dimensions match your PCB footprint requirements before ordering.

Selection Notes

Select this component when a 50W Zener diode with an 11V breakdown voltage is required. The TO-204AD package offers higher thermal capacity compared to smaller surface-mount alternatives. Consider the 0.8 Ohm impedance specification if tight voltage regulation under varying current loads is critical for the application design.

Part Context

This component belongs to the standard 1N series of Zener diodes, widely used in electronic circuit design for voltage stabilization. The 1N2809B specifically addresses high-power requirements within this family, distinguishing itself from lower-wattage variants through its substantial 50W rating and robust axial leaded construction.

Replacement Considerations

Check for parametric equivalents such as the 1N2809RB variant offered by distributors. Verify that any substitute maintains the 11V Zener voltage, 50W power rating, and compatible TO-204AD package form factor to ensure mechanical and electrical compatibility.