1N2821A

Overview

The Microchip Technology 1N2821A is a high-power Zener diode designed for robust voltage regulation in through-hole applications. It features a nominal Zener voltage of 25 V with a tolerance of ±10% and a maximum power dissipation of 50 W. The device utilizes the TO-204AD (TO-3) package, supporting an operating temperature range from -65°C to +175°C. Key electrical characteristics include a maximum reverse leakage current of 10 µA at 19 V and a forward voltage drop of 1.5 V at 10 A. The dynamic impedance is specified at a maximum of 2.7 Ohms.

Feature Summary

• High power handling capability of 50 W for demanding regulation tasks
• Extended thermal stability across a wide operating temperature range
• Robust axial leaded construction for secure mounting

Applications

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

Procurement Notes

Verify RoHS compliance status as the component may not meet current environmental directives. Confirm package dimensions against TO-204AD specifications during integration. Check for parameter-equivalent alternatives if availability is constrained. Ensure thermal management solutions align with the 50 W dissipation rating. Validate supplier documentation for accuracy regarding manufacturing origin and lot traceability.

Selection Notes

Select this component when high power dissipation and wide temperature operation are required. The TO-204AD package suits applications needing robust mechanical mounting. Consider the 25 V nominal voltage for specific reference needs. Evaluate thermal resistance requirements for the intended enclosure. Compare against lower-power variants if system constraints allow reduced wattage.

Part Context

This part belongs to the standard 1N series of Zener diodes manufactured by Microchip Technology. It serves as a legacy high-power solution for voltage reference and regulation. The TO-204AD package provides a reliable interface for industrial environments. It complements lower-power discrete semiconductors in complex power management systems.

Replacement Considerations

The 1N2821B is documented as a parameter-equivalent substitute within the same product family.