1N2818B

Overview

The Microchip Technology 1N2818B is a high-power Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 20 V with a tolerance of ±10%. The device supports a maximum power dissipation of 50 W and operates within an extended temperature range from -65°C to +175°C. Packaged in the TO-204AD (TO-3) through-hole format, it exhibits a maximum Zener impedance of 2.4 Ohms and a reverse leakage current of 10 µA at 15.2 V.

Feature Summary

• High power handling capability rated at 50 W for robust voltage regulation
• Extended thermal stability supporting operation up to +175°C
• Low impedance characteristic ensuring stable voltage reference under load variations

Applications

• Industrial power supply voltage regulation
• High-power protection circuits
• Reference voltage generation in heavy-duty equipment

Procurement Notes

Verify RoHS compliance status as the component may not meet standard environmental directives. Confirm package authenticity and lead times due to potential manufacturing delays. Ensure proper heat sinking infrastructure is available given the 50 W power rating. Validate supplier authorization to guarantee genuine Microchip Technology components.

Selection Notes

Select this component when high power dissipation and wide temperature operation are required. Compare against lower power alternatives if thermal management constraints exist. Verify that the 20 V nominal voltage aligns with circuit requirements. Consider the TO-204AD package size for mechanical integration.

Part Context

This part belongs to the 1N2818 series of high-power Zener diodes manufactured by Microchip Technology. It shares the base electrical characteristics with variants such as the 1N2818A and 1N2818RB, differing primarily in specific tolerance or packaging details. The series is categorized under discrete semiconductor diodes and rectifiers.

Replacement Considerations

The 1N2818RB is documented as a parameter-equivalent substitute. Verify pinout compatibility and thermal performance before substitution.