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L4940V5

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by Ray

STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-220. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

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L4940V5

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-220

L4940V5 from STMicroelectronics, in a TO-220. 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 INPUT power_in Unregulated input supply. Absolute maximum forward VI = 30 V; recommended operating VI up to 17 V. Reverse input voltage rated to -15 V with the recommended output resistor. Bypass to GND with CI = 0.1 uF close to the pin.
2 GROUND power_in Device ground and thermal reference. Electrically connected to the TO-220 mounting tab (heatsink). Carries quiescent current (typ. 5 mA at low load, ~30 mA at 1.5 A load) plus the load return current.
3 OUTPUT power_out Regulated +5 V output (4.8 V to 5.2 V over 5 mA to 1.5 A load, VI = 6.5 V to 15 V). Internally current-limited (Isc typ. 2 A) and thermally protected. Requires CO >= 22 uF for stability and transient response.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package TO-220
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • L4940V5
  • L4940D2T5-TR
  • L4940V85
  • L4940D2T12-TR

CAD (KiCad official)

  • Symbol: L4940V5
  • Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
  • 3D model: TO-220 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
l4940v5.step 83 KB You want the bare part, or you mark your own boards.
l4940v5-etched.step 651 KB You want the part with L4940V5 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 176 faces against 48 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: STMicroelectronics datasheet (25 pp, sha256 82b4fdbd2bcc1df9, 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