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LM2940S-3.3

Public Unreviewed

by Ray

HTC Korea TAEJIN Tech LM2940S 3 3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-3L. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

markdown

LM2940S-3.3

HTC Korea TAEJIN Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-3L

LM2940S-3.3 from HTC Korea TAEJIN Tech, in a SOT-223-3L. 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 input supply. Recommended operating range up to 26V (absolute maximum survival -20V to +30V). Requires CIN >= 1uF to the ground pin for stability.
2 GND power_in Device ground reference and return path. Ground pin current is typically 250uA at 5mA load and 16mA at 1A load (max 25mA at 1A).
3 VOUT power_out Regulated 3.3V output, capable of sourcing up to 1A continuous (limited by package power dissipation). Requires COUT >= 10uF for stability. Internal current limit is typically 1.5A.

Key specifications

Parameter Value
Manufacturer HTC Korea TAEJIN Tech
Package SOT-223-3L
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • LM2940S-3.3
  • LM2940T-3.3

The extractor listed these alongside LM2940S-3.3, but they are different parts with different electrical characteristics. Do not order them as substitutes.

  • LM2940S-5.0
  • LM2940T-5.0

CAD (KiCad official)

  • Symbol: LM2940S-3.3
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223-3L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm2940s-3-3.step 64 KB You want the bare part, or you mark your own boards.
lm2940s-3-3-etched.step 2.1 MB You want the part with LM2940S-3.3 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 500 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: HTC Korea TAEJIN Tech datasheet (7 pp, sha256 69be479de06a1346, 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