1N2821RB

Overview

The 1N2821RB is a hermetically sealed, single Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 25 V with a tolerance of ±5% and a maximum power dissipation of 50 W. The device utilizes internal solder bond construction and is housed in the TO-204AD (TO-3) through-hole package. Key electrical specifications include a maximum impedance of 2.7 Ohms, a leakage current of 10 µA, and a maximum forward voltage of 1.5 V.

Feature Summary

• Hermetically sealed welded construction for environmental protection
• Internal solder bond construction for reliability
• High power handling capability of 50 watts

Applications

• Voltage regulation in high-power circuits
• Overvoltage protection systems
• Reference voltage sources in industrial equipment

Procurement Notes

Verify component authenticity through authorized channels due to potential counterfeits. Confirm package integrity as hermetic seals are critical for performance. Check datasheet revisions for any manufacturing changes. Ensure compatibility with existing thermal management solutions given the 50W rating. Validate supplier authorization status before purchase.

Selection Notes

Select this component when a robust 25V reference with high power capacity is required. The TO-204AD package suits applications needing substantial heat dissipation. Consider the 2.7 Ohm impedance for noise-sensitive designs. Evaluate thermal resistance requirements against the 50W maximum dissipation limit. Compare alternatives if lower power or different voltage levels are sufficient.

Part Context

This part belongs to the JEDEC registered 1N2804 through 1N2846B series of 50 Watt Zener diodes. It shares design characteristics with other devices in this family, such as internal solder bonds and hermetic sealing. The series provides standardized voltage options for industrial and military applications requiring reliable voltage regulation under harsh conditions.

Replacement Considerations

Direct substitutes within the same series include 1N2804 through 1N2846B variants with matching voltage ratings. Cross-reference with 1N4557 through 1N4564B numbers for similar specifications. Verify pinout and package dimensions match TO-204AD standards before substitution.