1N2818RB

Overview

The Microchip Technology 1N2818RB is a high-power Zener diode designed for robust voltage regulation in through-hole applications. It features a nominal Zener voltage of 20 V with a tight tolerance of ±5%. The device is rated for a maximum power dissipation of 50 W, making it suitable for demanding industrial environments. It utilizes the TO-204AD (TO-3) package and operates within an extended temperature range of -65°C to 175°C. Key electrical characteristics include a reverse leakage current of 10 µA at 15.2 V, a forward voltage of 1.5 V at 10 A, and a maximum impedance of 2.4 Ohms.

Feature Summary

• High power handling capability of 50 W for stable regulation under heavy loads
• Extended operating temperature range from -65°C to 175°C for harsh environment reliability
• Hermetically sealed construction ensuring long-term durability
• Tight voltage tolerance of ±5% for precise reference applications

Applications

• Industrial power supply voltage regulation
• High-reliability military and aerospace circuits
• Overvoltage protection in critical systems
• Precision voltage reference sources

Procurement Notes

Verify compliance with RoHS directives as this component is explicitly listed as non-compliant. Confirm that the TO-204AD package dimensions match your PCB layout requirements. Ensure thermal management solutions are adequate for 50 W dissipation. Check for any specific military screening requirements if applicable to your project. Validate supplier authenticity given the specialized nature of hermetically sealed components.

Selection Notes

Select this component when high power dissipation and wide temperature operation are required. The TO-204AD package necessitates appropriate heatsinking and mounting hardware. Consider the 2.4 Ohm impedance for dynamic load regulation needs. Verify that the 20 V breakdown voltage aligns with system requirements. Evaluate thermal resistance parameters for enclosure design.

Part Context

This part belongs to the 1N2818 series of high-power Zener diodes manufactured by Microchip Technology. It is a through-hole device utilizing the TO-204AD package. The series is known for its robustness and suitability for high-reliability applications where standard plastic packages may fail. It serves as a discrete solution for voltage clamping and regulation in power electronics.

Replacement Considerations

Direct substitutes must match the 20 V Zener voltage, 50 W power rating, and TO-204AD package. Verify equivalent impedance and leakage specifications. Military-grade equivalents may require additional screening documentation. Cross-reference with other manufacturers offering hermetically sealed TO-3 Zener diodes with identical electrical ratings.