L78S09CV-DG

Overview

The L78S09CV-DG is a three-terminal positive linear voltage regulator from the STMicroelectronics L78Sxx series, providing a fixed 9V output with a maximum continuous current of 2A. It operates within an input voltage range up to 35V and features internal protections including thermal shutdown, short-circuit limiting, and safe operating area protection. The device is housed in a TO-220 package for through-hole mounting, ensuring reliable performance across an extended temperature range.

Feature Summary

• Integrated thermal overload protection prevents damage during excessive heat conditions
• Built-in short-circuit current limiting safeguards the component under fault conditions
• Safe Operating Area (SOA) protection ensures stability across varying load and voltage parameters

Applications

• Local on-card voltage regulation for electronic circuits
• Power supply units requiring stable 9V DC output
• General-purpose linear regulation in industrial equipment

Procurement Notes

Verify the specific suffix 'DG' against official STMicroelectronics documentation to confirm exact packaging or tape-and-reel specifications, as standard datasheets may primarily reference the 'CV' variant. Ensure compatibility with existing thermal management designs given the 2A current capability and TO-220 package constraints.

Selection Notes

Select this component when a robust 2A linear regulator is required for 9V applications. It offers superior current handling compared to the L78M09 series while maintaining the simplicity of three-terminal regulation. Consider thermal dissipation requirements carefully due to the linear topology's power loss characteristics at higher input-output differentials.

Part Context

This part belongs to the L78xx family of positive voltage regulators, widely used for local regulation tasks. The L78Sxx series specifically targets higher current demands than the standard L78xx or lower-power L78Mxx variants, making it suitable for applications needing up to 1.5A or 2A without complex switching circuitry.

Replacement Considerations

Direct pin-compatible substitutes include the L78S09CV. For lower current needs, the L78M09CV is an option but provides only 500mA. Cross-manufacturer equivalents like the MC78S09CT are available but require verification of specific electrical tolerances and thermal characteristics.