1N2973B

Overview

The Microchip Technology 1N2973B is a silicon Zener diode with a nominal regulation voltage of 9.1V and a tolerance of 5%. It features a power dissipation rating of 10W and operates within a temperature range of -65°C to +175°C. The component utilizes a DO-4 (DO-203AA) hermetically sealed glass axial package with one pin, where the case serves as the anode connection.

Feature Summary

• Hermetically sealed welded construction for environmental protection
• Internal solder bond construction for reliability
• Military qualification grades available per MIL-PRF-19500/124

Applications

• High-reliability voltage regulation circuits
• Military aerospace electronic systems
• Harsh environment power supply protection

Procurement Notes

Verify the specific suffix (e.g., B) against official datasheets to confirm voltage tolerance and qualification grade. Confirm lead-free status and RoHS compliance requirements prior to ordering, as military variants may differ from commercial versions. Ensure the DO-4 package form factor matches the design constraints.

Selection Notes

Select this component when high power handling and extreme temperature stability are required. The 10W rating supports significant current loads compared to standard small-signal diodes. Verify that the hermetic seal meets the specific environmental standards of the target application.

Part Context

This part belongs to the 1N2970B through 1N3015B series of 10W Zener diodes manufactured by Microchip Technology. These components are designed for robust performance in demanding applications, offering stable voltage regulation across a wide thermal range.

Replacement Considerations

Consult official documentation for direct substitutes within the same series or equivalent military-grade specifications. Cross-reference package dimensions and electrical tolerances carefully before substitution.