1N2979RD

Overview

The Microchip Technology 1N2979RD 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 DC Zener current of 640mA at 25°C stud temperature and a reverse current of 10µA at 11.4V. It utilizes a DO-4 (DO-213AA) package with standard polarity (anode to stud).

Feature Summary

• Hermetically sealed welded metal and glass construction for durability.
• Internal solder bond design ensures mechanical stability.
• Qualified per MIL-PRF-19500/124 for military reliability grades.

Applications

• Voltage regulation in harsh environments.
• Military and aerospace electronic circuits.
• Radiation-hardened system designs.

Procurement Notes

Verify the specific suffix 'RD' against official Microchip documentation, as datasheets typically list 'RB' for reverse polarity. Confirm the required qualification grade (JAN, JANTX, or JANTXV) matches project specifications. Ensure mounting hardware complies with the specified 10-32 thread requirements.

Selection Notes

Select this component for applications requiring high power dissipation and ruggedized packaging. Consider the thermal resistance of 12°C/W when designing heat management solutions. Verify that the 15V breakdown voltage aligns with the circuit's regulation needs and that the stud-mount configuration fits the available chassis space.

Part Context

This part belongs to the 1N2970B through 1N3015B series of 10W Zener diodes manufactured by Microsemi/Microchip. These devices are designed for high-reliability applications and offer a wide range of voltage options from 3.9V to 200V within the same standardized package family.

Replacement Considerations

Consult factory for surface mount equivalents. Direct substitutes may include other 1N2979 variants with different polarity suffixes (e.g., RB) or tolerance levels, provided they meet the MIL-PRF-19500/124 qualification standards.