1N2991A

Overview

The Microchip Technology 1N2991A is a silicon unidirectional Zener diode designed for stud-mount applications. It features a nominal Zener voltage of 36V with a tolerance of 10% and a maximum power dissipation of 10W. The device operates within a temperature range of -65°C to +175°C and utilizes a DO-4 (DO-203AA) hermetically sealed metal-glass package.

Feature Summary

• Hermetically sealed construction in a DO-4 metal-glass package
• High power handling capability of 10 watts
• Extended operating temperature range up to 175°C
• Stud-mount configuration for robust thermal management

Applications

• Voltage regulation in high-power circuits
• Overvoltage protection systems
• Military and aerospace electronic assemblies
• Industrial equipment requiring hermetic sealing

Procurement Notes

Verify the specific suffix code against official Microchip documentation to confirm exact electrical tolerances and packaging variations. Ensure the procurement channel provides traceability for military-grade components. Confirm that the received units match the specified hermetic seal requirements and package dimensions before integration into critical designs.

Selection Notes

Select this component when a 36V reference requires high power dissipation and environmental resilience. The stud-mount design necessitates appropriate heatsinking infrastructure. Verify that the 10% voltage tolerance meets circuit precision requirements. Consider the DO-4 package constraints for mechanical mounting and thermal interface planning during the design phase.

Part Context

This part belongs to the standard 1N2991 series of 10-watt Zener diodes. It serves as a ruggedized alternative to lower-power axial lead variants, offering superior thermal performance through direct chassis mounting. The hermetic seal distinguishes it from commercial glass-encapsulated equivalents, ensuring reliability in harsh environments.

Replacement Considerations

Cross-reference JANTX1N2991A for verified military-grade equivalents. Check 1N2991B for 5% tolerance variants if tighter voltage accuracy is required. Confirm pinout compatibility and thermal resistance characteristics before substituting.