1N3021B-1

Overview

The Microchip Technology 1N3021B-1 is a silicon voltage regulator diode designed for precision applications. It features a nominal Zener voltage of 11 V with a tight tolerance of ±5%. The component operates in the axial DO-41 package and supports a power dissipation of 1 W at case temperatures up to +95°C, with derating required above this threshold. It exhibits a maximum reverse leakage current of 25 µA and a Zener impedance of 7 Ohms. The device maintains functionality across an extended temperature range from -55°C to +175°C.

Feature Summary

• Hermetically sealed glass axial-leaded construction suitable for harsh environments
• Tight voltage tolerance available in standard plus or minus 5% configuration
• High thermal stability supporting operation up to +175°C junction temperature

Applications

• Precision voltage reference circuits requiring stable regulation
• Overvoltage protection stages in sensitive electronic systems
• Clamping applications within industrial control equipment

Procurement Notes

Verify the specific suffix against official datasheets to confirm exact tolerance grades and packaging options. Ensure compatibility with MIL-PRF-19500/115 standards if military-grade reliability is required. Confirm thermal management requirements align with the specified power derating characteristics above +95°C to prevent performance degradation during operation.

Selection Notes

Select this component when a robust 11 V regulation point is needed in a through-hole format. Consider the DO-41 package constraints regarding board space and thermal dissipation capabilities. Evaluate the ±5% tolerance against circuit sensitivity requirements to ensure adequate margin for voltage regulation accuracy under varying load conditions.

Part Context

This part belongs to the 1N3016B through 1N3045B series of 1-watt Zener diodes manufactured by Microchip Technology. The series offers various voltage ratings within a standardized axial package family. These components are widely utilized in general-purpose regulation tasks where moderate power handling and reliable performance are prioritized over miniaturization.

Replacement Considerations

Cross-reference with other 1N3021 variants or equivalent 11 V Zener diodes in the DO-41 package. Verify that substitute parts match the 1 W power rating and ±5% tolerance specifications. Ensure thermal characteristics and leakage currents remain within acceptable limits for the target application.