1N2844B

Overview

The 1N2844B is a unidirectional silicon Zener voltage regulator diode manufactured by Microchip Technology. It features a nominal reference voltage of 160 V and a power rating of 50 W. The device utilizes a TO-204AD (TO-3) metal flange mount package with two pins. Key electrical characteristics include a maximum Zener impedance of 80 Ohms and a tolerance of ±5%. It operates within a temperature range defined by its military-grade specifications.

Feature Summary

• High-power 50 W dissipation capability in a robust metal case
• Precision 160 V regulation with tight ±5% tolerance
• Hermetically sealed construction for harsh environments

Applications

• Military aerospace power supply regulation
• High-voltage protection circuits
• Industrial equipment overvoltage clamping

Procurement Notes

Verify the specific manufacturer source, as the component appears under both Microchip Technology and legacy Microsemi branding. Confirm RoHS compliance status, as some listings indicate non-compliance or hermetic sealing requirements. Ensure the TO-204AD package matches your thermal management design. Check for reverse polarity variants if cathode-to-case connection is required.

Selection Notes

Select this component for applications requiring high voltage stability at 160 V with significant power handling. The TO-3 package necessitates direct mounting to a heatsink for optimal thermal performance. Consider the 80 Ohm impedance for dynamic load responses. Verify that the unidirectional configuration aligns with your circuit's polarity requirements.

Part Context

This part belongs to the standard Zener diode family designed for high-power voltage regulation. It serves as a rugged alternative to lower-power planar devices, offering superior surge handling and thermal stability. The TO-3 package provides a low thermal resistance path to the chassis, essential for maintaining junction temperatures under continuous 50 W loads.

Replacement Considerations

Check for JANTX1N2844B equivalents which may offer enhanced military qualification. Verify pinout compatibility with existing TO-3 footprints. Ensure replacement parts maintain the same 160 V nominal voltage and 50 W power rating.