L78M12ACDT-TR

Overview

The L78M12ACDT-TR is a three-terminal positive linear voltage regulator from the L78MxxA series by STMicroelectronics. It provides a fixed 12 V output with a maximum current of 500 mA. The device operates within an input voltage range of 14.5 V to 30 V and features ±2% output voltage tolerance at 25°C. Electrical characteristics include a quiescent current of 6 mA, line regulation of 100 mV (VI = 14.5 to 30 V), load regulation of 240 mV (IO = 5 to 500 mA), and supply voltage rejection of 55 dB. It utilizes a DPAK surface-mount package.

Feature Summary

• Integrated thermal overload protection shuts down the circuit during excessive power conditions.
• Internal short-circuit protection limits maximum output current to prevent damage.
• Output transistor safe-area protection reduces output current as voltage across the pass transistor increases.

Applications

• Local on-card regulation
• Distribution systems

Procurement Notes

Verify that the component matches the specific AC grade suffix for the required operating temperature range of 0°C to 125°C. Confirm the DPAK package type aligns with PCB footprint requirements. Ensure the ordering code corresponds to the correct reel or cut tape packaging format specified in the official datasheet.

Selection Notes

Select this regulator when a fixed 12 V output is required with up to 500 mA capability. The AC variant is suitable for applications requiring operation between 0°C and 125°C. Consider the DPAK package for surface-mount designs where thermal resistance junction-to-ambient is approximately 100 °C/W.

Part Context

This component belongs to the L78MxxA series of precision 500 mA regulators available in TO-220 and DPAK packages. The series offers various fixed output voltages including 5, 6, 8, 9, 10, 12, 15, and 24 V. These devices are designed to eliminate distribution problems associated with single-point regulation by providing local control.

Replacement Considerations

L78M12ABDT-TR