L78M08ACDT-TR

Overview

The L78M08ACDT-TR is a three-terminal positive linear voltage regulator from the STMicroelectronics L78MxxA series. It provides a fixed 8 V output with a maximum current of 500 mA. The device operates within an extended temperature range of 0 to +125 °C and features internal thermal overload protection, short-circuit protection, and safe operating area (SOA) protection. It utilizes a DPAK surface-mount package.

Feature Summary

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

Applications

• Local on-card regulation
• Distribution systems requiring elimination of single-point regulation issues
• Adjustable voltage and current circuits using external components

Procurement Notes

Verify the specific AC suffix indicates the 0 to +125 °C operating range rather than the AB grade's -40 to +125 °C range. Confirm the DPAK package type matches the required footprint dimensions. Ensure input bypass capacitors are selected for high-frequency stability if long wire lengths are present between the supply filter and the regulator.

Selection Notes

Select this component when a fixed 8 V output at up to 500 mA is required in a compact surface-mount form factor. The AC variant is suitable for applications operating strictly above 0 °C. Consider the DPAK thermal resistance characteristics for heat dissipation requirements under full load conditions.

Part Context

This part belongs to the L78MxxA family of precision 500 mA regulators available in TO-220 and DPAK packages. The series offers multiple fixed output voltages including 5, 6, 8, 9, 10, 12, 15, and 24 V. These devices are designed to provide robust regulation with minimal external components.

Replacement Considerations

L78M08ABDT-TR