1N2989B

Overview

The Microchip Technology 1N2989B is a silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 30V with a tolerance of ±5%. The device has a power rating of 10W and operates in a stud-mount configuration within the DO-203AA (DO-4) package. Key electrical characteristics include a maximum Zener impedance of 8 Ohms and a forward voltage of 1.5V.

Feature Summary

• Provides stable voltage regulation at 30V with high power handling capability
• Utilizes a robust stud-mount construction suitable for thermal dissipation
• Constructed from silicon material for reliable unidirectional operation

Applications

• Voltage regulator circuits requiring 30V reference
• Power supply protection against overvoltage conditions
• Industrial equipment utilizing stud-mounted semiconductor components

Procurement Notes

Verify the manufacturer origin, as the component was originally associated with Microsemi Corporation before its acquisition by Microchip Technology. Confirm the specific ordering suffix if exact compliance or packaging variations are required. Ensure the DO-4 package dimensions match the intended mounting hardware. Check for hermetic sealing requirements if operating in harsh environments. Validate that the ±5% tolerance aligns with circuit design specifications.

Selection Notes

Select this component when a 10W Zener diode with a 30V breakdown voltage is required. The stud-mount style is appropriate for applications needing direct chassis mounting for heat sinking. Consider the 8 Ohm impedance limit for dynamic regulation performance. Ensure the DO-4 package fits the available board space and mounting constraints.

Part Context

The 1N2989B belongs to the family of silicon 10-watt Zener diodes manufactured by Microchip Technology. These devices are part of a long-standing series of rugged, stud-mounted regulators. The component serves as a critical element in high-power voltage stabilization systems where reliability and thermal management are prioritized.

Replacement Considerations

Check for equivalents such as the 1N2987B for similar 25V applications, though voltage ratings differ. Verify cross-manufacturer compatibility with other DO-4 Zener diodes offering 30V and 10W ratings. Ensure pinout and mechanical dimensions are identical for direct substitution.