1N2843A

Overview

The 1N2843A is a 50 W Zener diode with a nominal voltage of 150 V and a tolerance of ±10%. It operates in through-hole TO-204AD (TO-3) packages. The device features an impedance of 75 Ohms and a test current of 85 mA. Designed for robust voltage regulation, it supports high-power applications requiring stable reference voltages under significant thermal loads.

Feature Summary

• High power dissipation capability of 50 Watts
• Precision voltage regulation at 150 Volts
• Robust axial leaded construction for industrial environments

Applications

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

Procurement Notes

Verify the manufacturer origin, as Microchip acquired assets from Microsemi. Confirm the specific suffix indicates the ±10% tolerance variant. Ensure the package matches the TO-204AD footprint requirements for your PCB design. Check RoHS compliance status if required by your manufacturing standards.

Selection Notes

Select this component when a 150 V reference is needed with 50 W power handling. Compare impedance values against circuit stability requirements. Ensure the TO-3 package fits the mechanical constraints. Verify thermal management capabilities match the expected operating conditions.

Part Context

This part belongs to the standard 1N series Zener diodes, historically managed by Microsemi and now Microchip Technology. These components are widely used in legacy and modern industrial designs requiring reliable high-voltage regulation. The TO-3 package provides superior heat dissipation compared to smaller surface-mount alternatives.

Replacement Considerations

Direct substitutes include other 150 V 50 W Zener diodes in TO-3 packages. Cross-reference with JAN1N2843A for military-grade specifications. Verify pinout compatibility and thermal resistance characteristics before substitution.