1N2973A

Overview

The Microchip Technology 1N2973A is a silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 9.1 V with a tolerance of 10%. The device is rated for a power dissipation of 10 W and operates within a temperature range of -65 °C to +175 °C. It utilizes the DO-4 (DO-203AA) axial package, which supports hermetic sealing. The component is qualified under MIL-PRF-19500/124 standards, ensuring reliability in demanding environments.

Feature Summary

• Hermetically sealed construction using welded metal cans for environmental protection
• Internal solder bond construction for enhanced mechanical stability
• Qualified per MIL-PRF-19500/124 military specifications

Applications

• Military-grade voltage regulation circuits
• High-reliability reference voltage sources
• Over-voltage protection in aerospace systems

Procurement Notes

Verify that the specific order includes the 'A' suffix variant, as this denotes the 9.1 V specification distinct from other voltages in the 1N2970B through 1N3015B series. Confirm the presence of the JANTX or JAN qualification grade if military compliance is required. Ensure the DO-4 package dimensions match the design constraints. Check for leaded composition as RoHS exemption may apply to these heritage parts.

Selection Notes

Select the 1N2973A when a stable 9.1 V reference is needed in high-power scenarios up to 10 W. The DO-4 package allows for stud mounting or axial PCB integration. Consider the wide operating temperature range for extreme environment deployments. Verify thermal management requirements due to the significant power dissipation capability compared to smaller signal diodes.

Part Context

This component belongs to the JEDEC registered 1N2970B through 1N3015B series of 10 W Zener diodes manufactured by Microsemi, now part of Microchip Technology. The series offers voltage regulation values ranging from 3.9 V to 200 V. The 1N2973A specifically addresses the 9.1 V segment of this lineup, providing a standardized solution for industrial and military power supply designs requiring robust voltage clamping.

Replacement Considerations

Equivalent parts include the JAN1N2973A and JANTX1N2973A, which share the same electrical characteristics but differ in qualification grades. Cross-reference with other manufacturers offering DO-4 packaged 10 W Zener diodes at 9.1 V, ensuring hermetic sealing and MIL-PRF-19500/124 compliance are maintained.