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LM2940G-50-AA3-R

Public Made by Adom

by adom

UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-4. 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 lm2940g-50-aa3-r: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the pla… · Ray
viewers fix footprint: SOT-223 -> SOT-223-3_TabPin2 (symbol has pins 1,2,3; the old footprint left pad(s) 4 with no net) · Ray
lm2940g-50-aa3-r-etched.fit.json lm2940g-50-aa3-r: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lm2940g-50-aa3-r-etched.glb lm2940g-50-aa3-r: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the pla… · Ray
lm2940g-50-aa3-r-etched.step lm2940g-50-aa3-r: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the pla… · Ray
lm2940g-50-aa3-r-hero.glb Publish 0.2.1 · Ray
lm2940g-50-aa3-r-hero.overlay.json Publish 0.2.1 · Ray
lm2940g-50-aa3-r.glb Publish 0.1.0 · Ray
lm2940g-50-aa3-r.kicad_mod fix footprint: SOT-223 -> SOT-223-3_TabPin2 (symbol has pins 1,2,3; the old footprint left pad(s) 4 with no net) · Ray
lm2940g-50-aa3-r.kicad_sym Publish 0.1.0 · Ray
lm2940g-50-aa3-r.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
lm2940g-50-aa3-r.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 lm2940g-50-aa3-r: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

LM2940G-50-AA3-R

UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4

LM2940G-50-AA3-R from UTC Unisonic Tech, in a SOT-223-4. 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 VIN power_in Unregulated positive input supply. Operating range for 5V variant is 6.25V to 26V (absolute max 26V). Bypass with recommended input capacitor per datasheet.
2 GND power_in Ground reference / return. On SOT-223 the GND pin also serves as the primary thermal path via the tab (θJA = 174 °C/W).
3 VOUT power_out Regulated 5.0V output (4.85V min, 5.15V max). Supplies up to 1A load current. Requires a minimum 22µF output capacitor for stability per datasheet.

Key specifications

Parameter Value
Manufacturer UTC Unisonic Tech
Package SOT-223-4
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • LM2940G-50-AA3-R
  • LM2940G-50-AA3-RTA3-T
  • LM2940G-50-AA3-RTF3-T
  • LM2940G-50-AA3-RTN3-R
  • LM2940G-50-AA3-RTQ2-R
  • LM2940G-50-AA3-RTQ2-T
  • LM2940G-50-AA3-RTQ3-R
  • LM2940G-50-AA3-RTQ3-T

CAD (KiCad official)

  • Symbol: LM2940G-50-AA3-R
  • Footprint: Package_TO_SOT_SMD:SOT-223
  • 3D model: SOT-223-4 (KiCad packages3D, STEP)
  • 3D model files: lm2940g-50-aa3-r-etched.step / lm2940g-50-aa3-r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm2940g-50-aa3-r.step / lm2940g-50-aa3-r.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm2940g-50-aa3-r.step 64 KB You want the bare part, or you mark your own boards.
lm2940g-50-aa3-r-etched.step 2.6 MB You want the part with LM2940G-50-AA3-R already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 642 faces against 75 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: UTC Unisonic Tech datasheet (12 pp, sha256 2caeccb20b3d374c, 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