L78M15ACDT

Overview

The L78M15ACDT is a three-terminal positive linear voltage regulator from the L78MxxA series, manufactured by STMicroelectronics. It provides a fixed output voltage of 15 V with an output current capability up to 0.5 A. The device is housed in a DPAK surface-mount package and operates within a junction temperature range of 0 °C to 125 °C. Key electrical specifications include a maximum DC input voltage of 35 V, a typical quiescent current of 6 mA, and a dropout voltage of approximately 2 V at 25 °C. The unit features ±2% output voltage tolerance and includes internal protections against thermal overload, short circuits, and safe area operation.

Feature Summary

• Integrates internal current limiting, thermal shutdown, and safe area protection for robust operation under fault conditions.
• Provides local on-card regulation to eliminate distribution problems associated with single-point regulation systems.
• Capable of delivering fixed output voltages with high precision and stability across varying load and line conditions.

Applications

• Local on-card voltage regulation
• Distribution system power conditioning
• Battery chargers

Procurement Notes

Verify that the specific part number matches the required AC grade, which indicates a guaranteed operating temperature range starting from 0 °C rather than -40 °C. Confirm the DPAK package variant aligns with PCB footprint requirements. Ensure compliance with environmental directives such as RoHS if applicable to the target market. Cross-reference datasheet revision history for any mechanical or electrical updates before finalizing procurement orders.

Selection Notes

Select this component when a fixed 15 V output is required with moderate current demands up to 500 mA in a compact surface-mount form factor. Consider the thermal resistance characteristics of the DPAK package and ensure adequate heat sinking is available to maintain junction temperatures within the specified 0 °C to 125 °C range. Evaluate input voltage headroom to account for the typical 2 V dropout voltage under full load conditions.

Part Context

This device belongs to the L78MxxA family of precision regulators, designed as successors to earlier standard versions with improved tolerance and extended temperature guarantees. The L78M series complements the higher-current L78L and L78 families, offering a balance between performance and package size suitable for space-constrained electronic designs requiring reliable linear regulation.

Replacement Considerations

Compatible substitutes include other L78M15 variants from different manufacturers, provided they match the DPAK pinout and electrical specifications. Verify that replacement parts support the same AC temperature grade and output tolerance requirements to ensure circuit compatibility without redesign.