1N979A

Single Zener Diodes Overview

The Microchip Technology 1N979A is a single Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 56 V with a tolerance of ±10%. The device supports a maximum power dissipation of 500 mW and operates within an extended temperature range from -65°C to +175°C. Key electrical characteristics include a maximum reverse leakage current of 5 µA at 42.6 V, a forward voltage of 1.1 V at 200 mA, and a maximum Zener impedance of 150 Ohms. It utilizes the DO-204AA (DO-7) axial through-hole package.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation with a nominal 56 V Zener potential
• Capable of handling up to 500 mW power dissipation in a compact form factor
• Engineered for reliable operation across extreme temperatures ranging from -65°C to +175°C
• Constructed with axial leads for standard through-hole mounting configurations

Single Zener Diodes Applications

• General-purpose voltage reference circuits
• Overvoltage protection stages
• Biasing networks for semiconductor devices
• Clamping applications in analog signal paths

Single Zener Diodes Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number 1N979A with official Microchip Technology documentation. Confirm that the received units match the specified DO-7 package and electrical parameters. Ensure compliance with project requirements regarding RoHS status, as this specific variant may not adhere to current environmental directives. Validate supplier authorization to mitigate risks associated with counterfeit components.

Single Zener Diodes Selection Notes

Select the 1N979A when a precise 56 V regulation point is required with moderate power handling capabilities. Consider its wide operating temperature range for harsh environments. Evaluate the ±10% voltage tolerance against circuit precision needs. Compare the 150 Ohm impedance against dynamic load requirements. Ensure the through-hole DO-7 package aligns with the printed circuit board layout constraints.

Single Zener Diodes Part Context

This component belongs to the 1N979 series of Zener diodes manufactured by Microchip Technology. The series offers various voltage ratings within the same physical footprint, allowing for design flexibility. The 1N979A specifically denotes the 56 V variant within this standardized lineup, maintaining consistent thermal and mechanical characteristics across the family.

Single Zener Diodes Replacement Considerations

Publicly confirmed parameter-equivalent substitutes include the 1N979B, 1N979B/TR, and 1N979BE3 from Microchip Technology. Other manufacturers offer similar specifications under different part numbers, such as the BZX79-C56 from Nexperia USA Inc. Verify pinout compatibility and exact voltage tolerances before substitution.

Single Zener Diodes FAQ

What is the maximum power dissipation rating for the 1N979A?

The maximum power dissipation is rated at 500 mW.

Does the 1N979A support surface mount installation?

No, it is designed for through-hole installation using the DO-7 axial package.

What is the operating temperature range?

The device operates reliably between -65°C and +175°C.