1N2843RB

Overview

The 1N2843RB is a general-purpose Zener diode manufactured by Microchip Technology, designed for voltage regulation and reference applications. It features a nominal Zener voltage of 150V with a tolerance of ±5%. The device supports a maximum power dissipation of 50W and operates within a temperature range of 0°C to 175°C. Packaged in the TO-204AD (TO-3) through-hole format, it exhibits a dynamic impedance of 75 Ohms at the specified test current of 85mA. This component is suitable for high-power industrial environments requiring stable voltage clamping.

Feature Summary

• Provides stable voltage regulation with a nominal 150V breakdown voltage
• Capable of handling high power dissipation up to 50W for robust performance
• Engineered for extended thermal operation up to 175°C junction temperature
• Utilizes durable TO-204AD (TO-3) through-hole packaging for secure mounting

Applications

• High-voltage power supply regulation circuits
• Industrial equipment voltage reference standards
• Overvoltage protection in heavy-duty electronic systems

Procurement Notes

Verify RoHS compliance status as some sources indicate non-compliance due to lead content. Confirm the specific manufacturer source, as components are listed under both Microchip and Semicon Components Inc. Ensure the package type matches the required TO-204AD (TO-3) footprint for your assembly process before ordering.

Selection Notes

Select this component when a high-power, high-voltage Zener diode is required for rigid through-hole implementations. The 50W rating distinguishes it from lower-power surface-mount alternatives. Consider the 75 Ohm dynamic impedance for noise-sensitive applications, as higher impedance may affect regulation precision under varying load conditions.

Part Context

This part belongs to the standard 1N series of Zener diodes, widely used in legacy and industrial designs. Microchip Technology acquired the portfolio from Microsemi, maintaining production of these established components. The TO-3 package offers superior heat sinking capabilities compared to smaller plastic packages, making it ideal for high-energy dissipation scenarios.

Replacement Considerations

Direct substitutes include other 150V 50W Zener diodes in TO-204AD packages from manufacturers such as Vishay or ON Semiconductor. Verify that replacement parts match the ±5% tolerance and 75 Ohm dynamic impedance specifications to ensure circuit compatibility.