L78S12CT

Overview

The L78S12CT is a three-terminal positive linear voltage regulator from the STMicroelectronics L78S series, delivering a fixed 12V output with a maximum load current of 2.0A. It utilizes TO-3 through-hole packaging and operates within an ambient temperature range of -40°C to +125°C. The device incorporates internal thermal overload protection and current limiting to ensure reliability under fault conditions.

Feature Summary

• Fixed 12V output voltage regulation
• High current capability up to 2.0A
• Internal thermal overload and short-circuit protection

Applications

• Industrial power supply systems
• Embedded equipment power conditioning
• General-purpose positive voltage regulation

Procurement Notes

Verify the package type matches your PCB footprint requirements, as the L78S series typically uses TO-3 or TO-220 housings. Confirm that the thermal management strategy supports the 2.0A continuous current rating. Ensure the input voltage exceeds the dropout requirement for stable 12V operation across the specified temperature range.

Selection Notes

Select this component when a robust 2.0A fixed 12V source is required in a through-hole configuration. Compare against the L78M12CP if lower current (0.5A) suffices, or the L78L series for smaller packages. Verify that the TO-3 mounting style aligns with the mechanical design constraints of the target enclosure.

Part Context

Part of the L78Sxx family of three-terminal positive regulators designed for general-purpose applications. This series offers higher current handling than standard L78M variants while maintaining simple external component requirements. It serves as a foundational building block for stable DC power distribution in electronic circuits.

Replacement Considerations

Direct pin-compatible substitutes include other manufacturers' 12V 2A TO-3 regulators. Cross-reference electrical specifications such as line/load regulation and dropout voltage to ensure functional equivalence in the specific circuit topology.