1N2976A

Overview

The Microchip Technology 1N2976A is a silicon 10-watt Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 12V with a maximum impedance of 3 Ohms and a test current of 210mA. The device utilizes an internal solder bond construction within a hermetically sealed welded package, specifically the DO-213AA (TO-5) stud-mount configuration. This construction ensures reliability in harsh environments while providing stable voltage reference capabilities across standard operating conditions.

Feature Summary

• Hermetically sealed welded construction for environmental protection
• Internal solder bond design for mechanical stability
• Stud-mount configuration for efficient thermal dissipation

Applications

• Voltage regulation circuits requiring high power handling
• Overvoltage protection systems
• Reference voltage sources in industrial equipment

Procurement Notes

Verify the manufacturer origin carefully, as this component has been produced by multiple entities including Microsemi and Microchip Technology. Confirm the specific datasheet version to ensure alignment with required tolerance and impedance specifications. Check for RoHS compliance status if applicable to your assembly process, as historical versions may differ. Ensure the package type matches your mounting requirements.

Selection Notes

Select this component when a 10W power rating and 12V regulation are required in a ruggedized form factor. The stud-mount style necessitates appropriate heatsinking or chassis mounting solutions. Consider the hermetic seal requirement for aerospace or military-grade applications where moisture ingress must be prevented. Verify that the 3 Ohm impedance meets the dynamic regulation needs of the circuit.

Part Context

The 1N2976A belongs to the family of 10-watt silicon Zener diodes manufactured under various corporate histories, originally associated with Microsemi Corporation before its acquisition by Microchip Technology. These devices are characterized by their robust TO-5 metal can packages, which provide superior thermal performance compared to plastic equivalents. The part number designation follows standard JEDEC numbering conventions for high-power Zener regulators.

Replacement Considerations

The 1N2976R is a documented substitute variant offering similar electrical characteristics in the same package style. Verify pinout compatibility and thermal resistance values before substitution. Other generic 10W 12V Zener diodes in DO-213AA packages may fit mechanically but require verification of hermetic sealing and impedance specs.