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78M12

Public Unreviewed

by Ray

UMW Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-252. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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78M12

UMW · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252

78M12 from UMW, in a TO-252. Pinout and pin descriptions extracted from the datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 INPUT power_in Unregulated positive DC input supply. Absolute maximum 35V (up to 40V on 24V variant); recommended input range for the 12V option is ~14.5V to 27V (dropout ~2V typ at 500mA). A 0.33uF ceramic bypass capacitor to GND is required close to this pin.
2 GND power_in Common ground reference for input and output. In the TO-252/SOT-223 package this pin is bonded to the tab / thermal pad and is the primary thermal path (θJC = 12.5 °C/W for TO-252, 15 °C/W for SOT-223).
3 OUTPUT power_out Regulated +12V DC output, 11.52 V to 12.48 V at 25°C (Io = 5 mA to 350 mA, Vi = 19V). Sources up to 1A continuous; internally current-limited (Isc ≈ 800 mA at Vi = 35V) and thermally protected. A 0.1uF output capacitor is recommended for stability.

Key specifications

Parameter Value
Manufacturer UMW
Package TO-252
Category PMIC
Pins 3

CAD (KiCad official)

  • Symbol: 78M12
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
78m12.step 119 KB You want the bare part, or you mark your own boards.
78m12-etched.step 1.0 MB You want the part with 78M12 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 285 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: UMW datasheet (16 pp, sha256 162df1416fa16ead, 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