L78M09CDT-TR

Overview

The L78M09CDT-TR is a fixed linear voltage regulator from the STMicroelectronics L78Mxx series, housed in a surface-mount TO-252-3 package. It provides a fixed output voltage of 9 V with a maximum continuous output current of 500 mA. The device accepts an input voltage up to 35 V and operates within a junction temperature range of 0°C to 150°C. Internal protection mechanisms include thermal overload shutdown and current limiting.

Feature Summary

• Integrated thermal overload protection prevents damage during excessive power dissipation.
• Built-in current limiting safeguards the device against short-circuit conditions and overloads.
• Surface-mount TO-252-3 packaging facilitates automated assembly and compact circuit board design.

Applications

• General-purpose positive voltage regulation in electronic circuits
• Local on-card regulation for logic systems requiring stable 9V supply
• Power supplies for industrial control equipment

Procurement Notes

Verify the component authenticity by checking the manufacturer's marking and datasheet specifications against the received part. Confirm that the TO-252-3 package matches the required footprint and pinout for your PCB layout. Ensure the operating environment stays within the specified thermal limits to maintain reliability. Cross-reference the orderable part number with official distributor catalogs to confirm availability and lead times before finalizing procurement plans.

Selection Notes

Select this component when a fixed 9V output at 500mA is required in a surface-mount form factor. It serves as a direct replacement for through-hole L78M09 variants where space constraints necessitate SMD solutions. Consider the thermal performance and heat dissipation requirements of the TO-252-3 package relative to the expected load current and ambient temperature conditions.

Part Context

This part belongs to the L78Mxx family of three-terminal positive linear regulators. Unlike the standard L78xx series which typically supports 1A, the L78Mxx series is optimized for lower current applications up to 500mA. The 'CDT' suffix indicates the specific TO-252-3 surface-mount package and tape-and-reel shipping configuration used for automated manufacturing processes.

Replacement Considerations

Compatible substitutes include other manufacturers' equivalents such as MC78M09CDTG or NCV78M09CDT. Verify that any replacement maintains the same 9V output, 500mA current rating, and TO-252-3 package dimensions to ensure mechanical and electrical compatibility without redesigning the PCB.