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LM2940G-50-AA3-R

Public Unreviewed

by Ray

UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-4. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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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 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