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78L12

Public Unreviewed

by Ray

UMW Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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78L12

UMW · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

78L12 from UMW, in a SOT-89-3. Pinout and pin descriptions extracted from the datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 Output power_out Regulated +12V output. Delivers up to 100 mA (typ) with ~1.7 V dropout. Requires a ceramic bypass capacitor (CO=0.1 µF typ) to ground for stability.
2 GND power_in Common ground reference for input and output. Also carries the quiescent current (~2 mA typ, 5.5 mA max).
3 Input power_in Unregulated DC input. Absolute maximum 35 V (Vo≤18V variants). Recommended input capacitor C1=0.33 µF to ground for line-transient rejection. For the 78L12 the recommended operating input range is 14.5 V to 27 V.

Key specifications

Parameter Value
Manufacturer UMW
Package SOT-89-3
Category PMIC
Pins 3

CAD (KiCad official)

  • Symbol: 78L12
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
78l12.step 57 KB You want the bare part, or you mark your own boards.
78l12-etched.step 891 KB You want the part with 78L12 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 242 faces against 42 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 (22 pp, sha256 3eeae843c9f51425, 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