1N2979A

Overview

The 1N2979A is a single-terminal Zener diode manufactured by Microchip Technology, formerly Freescale. It features a nominal reference voltage of 15 V with a maximum tolerance of 10%. The device operates at a test current of 170 mA and exhibits a maximum dynamic impedance of 3 Ω. Designed for stud-mount installation in the DO-4 package, it supports a maximum power dissipation of 10 W and functions within an operating temperature range up to 175 °C.

Feature Summary

• Provides stable voltage regulation through Zener breakdown characteristics at a fixed 15 V reference point.
• Capable of handling high power dissipation up to 10 W for robust performance in demanding environments.
• Engineered for stud-mount configuration to facilitate efficient thermal management and secure mechanical attachment.

Applications

• Voltage regulation in high-power electronic circuits
• Overvoltage protection systems requiring robust clamping
• Reference voltage sources in industrial instrumentation

Procurement Notes

Verify the manufacturer origin, as historical data indicates production by Freescale or NXP prior to acquisition. Confirm the specific package variant matches the required mounting style. Ensure compliance with RoHS directives if applicable to your project requirements. Cross-reference datasheets from authorized distributors to confirm current availability and manufacturing status.

Selection Notes

Select this component when a 15 V regulated supply is needed with significant power handling capabilities. The DO-4 stud-mount package is suitable for applications requiring direct heat sinking. Consider the 10% voltage tolerance and 3 Ω dynamic impedance when designing precision regulation loops. Ensure the circuit design accommodates the 170 mA test current for accurate voltage referencing.

Part Context

This component belongs to the standard Zener diode family used for voltage regulation and protection. It represents a legacy part number often associated with older Freescale or National Semiconductor product lines. The DO-4 package is a traditional axial leaded stud-mount style, distinct from modern surface-mount technologies. It serves as a fundamental discrete semiconductor device for analog circuit design.

Replacement Considerations

Check for equivalents from other manufacturers offering identical 15 V, 10 W specifications in a DO-4 package. Verify pinout compatibility and thermal resistance values before substitution. Ensure that any replacement part meets the same maximum operating temperature and dynamic impedance requirements.