L7812T

Overview

The L7812T is a fixed positive linear voltage regulator from the L78xx series, manufactured by STMicroelectronics. It provides a nominal output voltage of 12 V with a maximum continuous output current capability of 1.5 A. The device operates within an input voltage range of 14 V to 35 V and features internal protection mechanisms including thermal overload shutdown and safe area protection. It is housed in a TO-220 package designed for through-hole mounting.

Feature Summary

• Provides a stable fixed positive output voltage
• Includes internal thermal overload protection
• Features built-in safe area protection

Applications

• General-purpose power supply regulation
• Local on-card regulation for distributed power systems
• Positive linear power supplies

Procurement Notes

Verify the specific manufacturer marking and datasheet revision when sourcing this component. Confirm that the package type matches the required PCB footprint. Ensure the supplier provides documentation confirming compliance with relevant safety standards.

Selection Notes

Select this component for applications requiring a simple, robust solution for stepping down higher DC voltages to a stable 12 V level. Consider the thermal dissipation requirements associated with the voltage drop across the regulator at the expected load current.

Part Context

This part belongs to the L78xx family of three-terminal positive linear regulators. These devices are widely used in industrial and consumer electronics for basic voltage regulation tasks where high efficiency is not the primary design constraint.

Replacement Considerations

Compatible replacements include the LM7812 and MC7812. Verify pinout compatibility and thermal performance characteristics before substituting.