1N2976B

Overview

The 1N2976B is a 10-watt Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 12V with a tolerance of ±5%. The device operates in the DO-4 (DO-213AA) stud-mount package, designed for high-power applications requiring robust thermal management. Key electrical parameters include a maximum Zener impedance of 3 ohms and a test current of 210mA. This component serves as a voltage reference or regulator in circuits demanding stable DC output under significant power dissipation conditions.

Feature Summary

• High power handling capability rated at 10 watts for sustained operation
• Stud-mount construction facilitates direct attachment to heat sinks
• Precision voltage regulation with tight tolerance for reliable reference performance

Applications

• High-power voltage regulation circuits
• Overvoltage protection systems
• Industrial control power supplies

Procurement Notes

Verify the manufacturer source carefully, as this part number is historically associated with multiple vendors including Microsemi and Digitron. Ensure the specific datasheet matches the required tolerance and package specifications. Confirm that the supplier provides genuine components from an authorized distribution channel to guarantee reliability and compliance with technical standards.

Selection Notes

Select this component when a 12V reference requires 10W power dissipation capacity. The stud-mount package necessitates appropriate mechanical mounting hardware and thermal interface materials. Consider the 3-ohm impedance characteristic for dynamic load regulation requirements. Ensure the operating environment supports the thermal constraints inherent to through-hole stud-mounted devices.

Part Context

This device belongs to the standard 1N29xx series of high-power Zener diodes. These components are widely used in legacy and industrial designs where robust voltage clamping is essential. The 1N2976B specifically addresses applications needing precise 12V regulation with significant power handling, distinguishing it from lower-power surface-mount alternatives.

Replacement Considerations

Compatible substitutes include the 1N2976R and 1N2976A, which share similar electrical characteristics but may differ in tolerance levels or manufacturer-specific packaging details. Verify pinout compatibility and thermal resistance values before substitution.