1N2979C

Overview

The Microchip Technology 1N2979C is a 10W Zener diode with a nominal voltage of 15V. It operates within a junction temperature range of -65°C to +175°C and features a maximum dynamic impedance of 3 Ohms at the test current of 170mA. The device has a maximum reverse leakage current of 10µA and a positive temperature coefficient of 0.082%/°C. It utilizes a DO-4 (DO-203AA) stud mount package with standard polarity, where the anode connects to the stud.

Feature Summary

• Hermetically sealed welded metal and glass construction for environmental protection
• Internal solder bond construction ensuring mechanical stability
• Qualified per MIL-PRF-19500/124 for JAN, JANTX, and JANTXV reliability levels
• Inherently radiation hard design suitable for harsh environments

Applications

• Voltage regulation over broad current and temperature ranges
• Military and aerospace electronic systems requiring high reliability
• Radiation-hardened circuit protection applications

Procurement Notes

Verify the specific suffix configuration against the datasheet nomenclature. The 'C' suffix indicates a 5% tolerance level. Confirm that the required polarity matches the standard anode-to-stud configuration unless a reverse polarity variant is explicitly ordered. Ensure mounting hardware complies with the specified thread requirements.

Selection Notes

Select this component when a 15V regulation point is required in a high-power 10W application. The DO-4 stud mount package facilitates direct heat sinking to chassis or cold plates. Consider the positive temperature coefficient for thermal stability analysis in circuits operating across wide ambient temperature variations.

Part Context

This part belongs to the 1N2970B through 1N3015B series of 10W Zener diodes. These devices are JEDEC registered and offer voltage regulation values ranging from 6.8V to 200V. The series provides multiple military qualification grades to meet diverse ruggedized system requirements.

Replacement Considerations

Equivalent parts include other manufacturers' 1N2979 variants meeting MIL-PRF-19500/124 specifications. Verify that replacement units maintain the same DO-4 package dimensions and stud polarity to ensure mechanical compatibility.