1N2831A

Overview

The Microchip Technology 1N2831A is a high-power silicon Zener diode designed for robust voltage regulation applications. It features a nominal Zener voltage of 51V with a tolerance of 10%. The device is rated for a maximum power dissipation of 50W, allowing it to handle significant energy loads when paired with appropriate heat sinking. Constructed in a TO-204AD (TO-3) metal flange mount package, the component ensures efficient thermal transfer from the case to the heatsink. The cathode is electrically connected to the metal case, facilitating direct mounting. It operates within a temperature range of -65°C to 175°C and is available in military-grade qualifications such as JANTX.

Feature Summary

• High power handling capability up to 50W with low thermal resistance
• Hermetically sealed metal flange mount construction for durability
• Wide operating temperature range suitable for extreme environments
• Military qualification options available for reliability-critical systems

Applications

• High-power voltage regulation circuits
• Overvoltage protection in industrial equipment
• Reference voltage sources in precision instrumentation
• Surge suppression in aerospace and defense electronics

Procurement Notes

Verify the specific suffix code (e.g., RA, E3) to confirm exact electrical tolerances, hermetic sealing status, and lead material compliance. Ensure the procurement specification matches the required military or commercial grade. Confirm that the supplier provides traceability documentation for the TO-204AD package variant. Check for RoHS exemption status if applicable to the manufacturing batch.

Selection Notes

Select this component when a stable 51V reference is required at high power levels. The TO-3 package necessitates careful mechanical design for proper thermal interface and electrical isolation if the case is not grounded. Consider the 10% voltage tolerance for circuit accuracy. Evaluate the thermal resistance requirements to ensure the heatsink can maintain junction temperatures within the 175°C limit under continuous 50W operation.

Part Context

The 1N2831A belongs to the 1N2804 through 1N2846B series of 50W Zener diodes manufactured by Microsemi, now part of Microchip Technology. This family offers a broad range of voltages from 3.9V to 200V in the same rugged TO-3 package. These diodes are engineered for applications requiring high surge current handling and long-term stability in harsh conditions.

Replacement Considerations

Equivalent parts include the NXP 1N2831RA and Microsemi 1N2831E3. Verify that substitute components match the 51V nominal voltage, 10% tolerance, and 50W power rating. Ensure the replacement package is compatible with the existing TO-3 mounting hardware and that the case connection polarity remains consistent.