STMicroelectronics L78M05CDT-TR

The L78M05CDT-TR provides a regulated 5 V output for local point-of-load regulation. It belongs to the C-grade L78M family and integrates current limiting, thermal shutdown, and safe-operating-area protection. With adequate thermal management, the regulator can supply up to 500 mA and may deliver more than 500 mA under suitable heatsinking conditions.

The exact orderable device is listed by STMicroelectronics in DPAK. The LCDChip catalog records the corresponding package as TO-252-3, DPAK (2 Leads + Tab), SC-63; the registered package image uses the canonical TO-252-3 name.

Layout checks

• Use the manufacturer's DPAK land pattern and dimensional drawing.
• Connect the exposed tab and pin 2 to ground.
• Provide adequate copper area for heat spreading and current return.
• Keep the input and output bypass capacitors close to their respective pins and ground.

Package identification and tab connection were checked against the STMicroelectronics L78M pin-connection and package documentation.

The following functions apply to the DPAK top view shown in the STMicroelectronics datasheet.

Confirm footprint numbering and viewing orientation against the latest controlled package drawing before PCB release.

Unless otherwise stated, the L78M05C electrical table uses V_I = 10 V, I_O = 350 mA, C_I = 0.33 µF, C_O = 0.1 µF, and T_J = 25 °C. Typical values are not guaranteed limits.

Evaluate substitutes as complete orderable parts. Match the fixed 5 V output, output-current requirement, DPAK footprint, pin numbering, grounded tab, C-grade temperature range, accuracy limits, dropout behavior, stability requirements, protection behavior, and tape-and-reel format. An L78M05A-family device may offer tighter output-voltage tolerance, but suffix, temperature grade, package, and ordering format must still be verified. Do not assume that a generic 7805-family device is footprint-compatible.

STMicroelectronics identifies L78M05CDT-TR as an active, volume-production industrial device in the DPAK package with Ecopack2 compliance. The C suffix identifies the C-grade electrical limits, DT identifies the DPAK ordering form, and -TR denotes tape-and-reel shipment.

Verify the complete ordering code, manufacturer traceability, package condition, moisture-handling controls, and lot documentation during incoming inspection. Confirm top marking and package dimensions against current STMicroelectronics documentation; do not identify the electrical grade from appearance alone.

Use this summary for component screening, then verify the latest STMicroelectronics datasheet, package drawing, qualification information, and product-status notice before design release. Check worst-case power dissipation P = (V_IN - V_OUT) × I_OUT plus quiescent-current loss, and keep the junction temperature within rating under normal and fault conditions.