1N2839A

Overview

The Microchip Technology 1N2839A is a high-power silicon Zener diode designed for voltage regulation and reference applications. It features a nominal Zener voltage of 100V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 50W at case temperatures up to 75°C, de-rating linearly above this threshold. It utilizes the TO-204AD (TO-3) flange mount package, providing robust thermal performance for industrial environments. Operating characteristics include a test current of 120mA and a maximum reverse leakage current of 5µA at 95V. The component supports an extended operating junction temperature range from -65°C to +175°C.

Feature Summary

• High power handling capability with 50W dissipation rating in a metal flange mount package
• Precision voltage regulation with tight ±5% tolerance on nominal 100V breakdown voltage
• Extended thermal stability supporting operation up to 175°C junction temperature
• Low leakage current characteristics ensuring stable performance under reverse bias conditions

Applications

• High-voltage power supply regulation circuits
• Industrial overvoltage protection systems
• Precision voltage reference sources in harsh environments
• Surge suppression in heavy-duty electrical equipment

Procurement Notes

Verify the specific suffix designation upon ordering, as variations such as 'C' or 'B' may indicate different tolerance levels or testing criteria compared to the standard 'A' version. Confirm RoHS compliance status directly with the manufacturer, as historical production runs for this series often lack environmental certification. Ensure that the procurement documentation explicitly states the package type and pin configuration to avoid integration errors during assembly.

Selection Notes

Select the 1N2839A when a stable 100V reference is required in high-power scenarios where thermal management is critical. The TO-204AD package necessitates direct mounting to a heatsink or chassis for effective heat dissipation. Evaluate the derating curve carefully if ambient temperatures exceed 75°C to prevent thermal runaway. This component is suitable for designs requiring ruggedness and long-term reliability in demanding industrial or military-grade applications.

Part Context

The 1N2839A belongs to the legacy 1N28xx series of high-power Zener diodes manufactured by Microchip Technology. This series is characterized by its use in high-voltage, high-current applications where standard surface-mount devices are insufficient. The TO-204AD package is a traditional metal can style that offers superior thermal conductivity compared to plastic packages. These components are often specified in aerospace, defense, and heavy industrial equipment due to their proven reliability and wide operating temperature ranges.

Replacement Considerations

Cross-reference with other manufacturers offering TO-204AD packaged Zener diodes with identical 100V/50W specifications. Verify that any substitute matches the ±5% tolerance and thermal resistance characteristics. Ensure the replacement part supports the same flange mount configuration and pinout compatibility.