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78L12

Public Made by Adom

by adom

UMW Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
Name Last commit message Last updated
docs 78l12: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 2mo ago
78l12-etched.fit.json 78l12: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
78l12-etched.glb 78l12: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
78l12-etched.step 78l12: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
78l12.glb Publish 0.1.0 · Ray 2mo ago
78l12.kicad_mod Publish 0.1.0 · Ray 2mo ago
78l12.kicad_sym Publish 0.1.0 · Ray 2mo ago
78l12.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 2mo ago
78l12.step Publish 0.1.0 · Ray 2mo ago
package.json Publish 0.2.0 · Ray 2mo ago
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 2mo ago
page.json 78l12: specified limits as data (metadata.characteristics, 9 rows from the datasheet) · Ray 19d ago
README.md 78l12: specified limits as data (metadata.characteristics, 9 rows from the datasheet) · Ray 19d ago

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

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output voltage (TJ=25°C) VO 11.52 12 12.48 V TJ=25°C 9
Output voltage VO 11.4 12.6 V 14.5V≤VI≤27V,IO=1mA~40mA 9
Quiescent current Iq 5.5 mA 9
Quiescent current change (line) ΔIq 15 mA 16V≤VI≤27V 9
Quiescent current change (load) ΔIq 0.1 mA 1mA ≤IO≤40mA 9
Input voltage (for VO=3.3 to 18V) VI 35 V for VO=3.3 to 18V 2
Junction temperature range TOPR -20 120 °C 2
Storage temperature range TSTG -55 150 °C 2
Power dissipation (SOT-89) Pd 400 mW SOT-89 package 2

CAD (KiCad official)

  • Symbol: 78L12
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: 78l12-etched.step / 78l12-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 78l12.step / 78l12.glb are the bare package body.

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