1N2820B

Overview

The Microchip Technology 1N2820B is a silicon unidirectional Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 24V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 50W and operates in a TO-204AD (TO-3) through-hole package. Key electrical characteristics include a test current of 520mA, an impedance of 2.6 Ohms, and a leakage current of 10µA.

Feature Summary

• Provides stable voltage regulation at a fixed 24V reference point
• Capable of handling high power dissipation up to 50W
• Constructed from silicon for reliable unidirectional operation

Applications

• High-power voltage regulation circuits
• Overvoltage protection systems
• Reference voltage sources in analog electronics

Procurement Notes

Verify the manufacturer source carefully as this component has been produced by multiple vendors including Motorola and Central Semiconductor. Confirm that the specific unit acquired matches the Microchip Technology specification sheet regarding the 5% tolerance and 50W rating. Ensure the package type is correctly identified as TO-204AD to guarantee mechanical compatibility with existing heat sinks and mounting hardware.

Selection Notes

Select this component when a robust 24V regulation solution is required for high-current loads. The 50W power rating distinguishes it from lower-power alternatives, making it suitable for industrial environments. Consider the thermal management requirements associated with the TO-3 package to ensure efficient heat dissipation during continuous operation under full load conditions.

Part Context

This part belongs to the standard 1N28xx series of high-power Zener diodes originally defined by military specifications. While historically manufactured by various semiconductor companies, Microchip Technology continues to produce variants within this lineage. The 'B' suffix typically denotes the tighter 5% tolerance compared to other series members like the 1N2820A which may offer 10% tolerance.

Replacement Considerations

Direct substitutes include the 1N2820A if a 10% tolerance is acceptable. Other equivalents from different manufacturers must be verified against the 24V Zener voltage, 50W power rating, and TO-3 package dimensions to ensure functional interchangeability.