component

CJ78M12

Public Made by Adom

by adom

Changjing 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 cj78m12: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STEP) · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
cj78m12-etched.fit.json cj78m12: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
cj78m12-etched.glb cj78m12: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STEP) · Ray
cj78m12-etched.step cj78m12: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STEP) · Ray
cj78m12.glb Publish 0.1.0 · Ray
cj78m12.kicad_mod Publish 0.1.0 · Ray
cj78m12.kicad_sym Publish 0.1.0 · Ray
cj78m12.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
cj78m12.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 cj78m12: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

CJ78M12

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

CJ78M12 from Changjing, 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 IN power_in Unregulated input voltage. Absolute maximum 35V; recommended operating range 14.5V to 30V. Bypass to GND with a 0.33uF ceramic capacitor close to the pin.
2 GND power_in Common ground reference for both input and output. On the TO-252-2L variant this pin is fused to the exposed tab/heat sink.
3 OUT power_out Regulated +12V output. Nominal 12V (11.4-12.6V over full temperature range); supplies up to 0.5A peak (0.7A internal current limit). Requires a 0.1uF output capacitor to GND for stability.

Key specifications

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

CAD (KiCad official)

  • Symbol: CJ78M12
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)
  • 3D model files: cj78m12-etched.step / cj78m12-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cj78m12.step / cj78m12.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
cj78m12.step 119 KB You want the bare part, or you mark your own boards.
cj78m12-etched.step 1.4 MB You want the part with CJ78M12 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 363 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: Changjing datasheet (1 pp, sha256 235ab67f614603e6, retrieved 2026-08-17, tier: lcsc)
  • 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