L78L24ACD

Overview

The L78L24ACD is a three-terminal positive linear voltage regulator from the STMicroelectronics L78L series, designed for fixed output applications. It provides a nominal 24 V output with a maximum continuous current of 100 mA. The device features internal thermal overload protection and short-circuit protection, ensuring robust operation under fault conditions. It operates within an ambient temperature range of 0 to 125 °C and accepts input voltages up to 40 V. The component utilizes a DPAK surface-mount package.

Feature Summary

• Internal thermal shutdown and current limiting mechanisms protect against overheating and short circuits.
• Designed for local or on-card regulation to eliminate noise associated with single-point distribution.
• Requires no external components for basic fixed voltage regulation functionality.

Applications

• Local on-card voltage regulation
• Replacement for Zener diode and resistor combinations
• General-purpose fixed voltage power supplies

Procurement Notes

Verify the specific package type (DPAK) matches the design requirements, as the L78L series is available in multiple form factors including TO-92 and SOT-89. Confirm that the AC tolerance selection aligns with circuit precision needs. Ensure adequate copper area is allocated on the PCB for heat dissipation given the thermal resistance characteristics of the DPAK package.

Selection Notes

Select this component when a fixed 24 V output is required with moderate current demands up to 100 mA. The AC suffix indicates a specific voltage tolerance band; verify if this meets system accuracy requirements compared to other series variants. Consider the thermal management capabilities of the DPAK package relative to the expected power dissipation in the target application environment.

Part Context

This part belongs to the L78Lxx series of three-terminal positive regulators manufactured by STMicroelectronics. The series is characterized by its simplicity, requiring no external components, and offering built-in safety features like thermal shutdown. It serves as a standard solution for low-to-medium current regulation tasks in consumer and industrial electronics.

Replacement Considerations

Direct pin-compatible replacements may include other manufacturers' L78L24 variants in DPAK packages. Verify electrical specifications such as dropout voltage and quiescent current match the original design constraints before substitution.