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L78M12CDT-TR

Public Made by Adom

by adom

STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-252-2(DPAK). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs l78m12cdt-tr: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain S… · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
l78m12cdt-tr-etched.fit.json l78m12cdt-tr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
l78m12cdt-tr-etched.glb l78m12cdt-tr: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain S… · Ray
l78m12cdt-tr-etched.step l78m12cdt-tr: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain S… · Ray
l78m12cdt-tr-hero.glb Publish 0.2.1 · Ray
l78m12cdt-tr-hero.overlay.json Publish 0.2.1 · Ray
l78m12cdt-tr.glb Publish 0.1.0 · Ray
l78m12cdt-tr.kicad_mod Publish 0.1.0 · Ray
l78m12cdt-tr.kicad_sym Publish 0.1.0 · Ray
l78m12cdt-tr.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
l78m12cdt-tr.step Publish 0.1.0 · Ray
package.json Publish 0.2.1 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json Publish 0.2.1 · Ray
README.md l78m12cdt-tr: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

L78M12CDT-TR

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252-2(DPAK)

L78M12CDT-TR from STMicroelectronics, in a TO-252-2(DPAK). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 INPUT power_in Unregulated positive DC input. Absolute maximum 35 V for 5-18 V output versions (40 V for 20/24 V versions). Bypass to GND with ~0.33 uF ceramic close to the pin for stability and transient rejection.
2 GND power_in Common ground reference for input and output. Electrically connected to the DPAK tab (heatsink); the tab must be soldered to a copper pour that acts as both the ground return and the primary heat-dissipation path (RthJA ~= 100 C/W without additional heatsinking).
3 OUTPUT power_out Regulated +12 V output, 500 mA nominal (internally current-limited). Requires a 0.1 uF ceramic bypass close to the pin to ensure loop stability and transient response.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package TO-252-2(DPAK)
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • L78M12CDT-TR
  • L78M12CDT-TRCV
  • L78M12CDT-TRABV
  • L78M12CDT-TRCH

CAD (KiCad official)

  • Symbol: L78M12CDT-TR
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)
  • 3D model files: l78m12cdt-tr-etched.step / l78m12cdt-tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); l78m12cdt-tr.step / l78m12cdt-tr.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
l78m12cdt-tr.step 119 KB You want the bare part, or you mark your own boards.
l78m12cdt-tr-etched.step 1.6 MB You want the part with L78M12CDT-TR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 436 faces against 83 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (46 pp, sha256 bf25de1549fb4045, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF