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LD1117S33CTR

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by Ray

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

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LD1117S33CTR

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4

LD1117S33CTR from STMicroelectronics, 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 GND power_in Device ground / common reference. Also carries the internal adjust/reference return current.
2 VOUT power_out Regulated 3.3 V output, up to 800 mA. Requires a minimum 10 µF capacitor to ground for stability. The exposed SOT-223 tab is internally connected to this pin.
3 VIN power_in Unregulated input supply. Absolute max 15 V DC (18 V when IOUT < 20 mA). A 100 nF input capacitor is recommended near the pin.
4 TAB passive SOT-223 heat-sink tab, internally tied to VOUT. Solder to a copper pour for thermal dissipation; the pour is at VOUT potential.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOT-223-4
Category PMIC
Pins 4

Ordering variants

Same part, different packaging or reel option.

  • LD1117S33CTR
  • LD1117S33CTRV33
  • LD1117S33CTRV33C
  • LD1117S33CTRDT33
  • LD1117S33CTRDT33TR
  • LD1117S33CTRD33
  • LD1117S33CTRD33TR

CAD (KiCad official)

  • Symbol: LD1117S33CTR
  • 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
ld1117s33ctr.step 64 KB You want the bare part, or you mark your own boards.
ld1117s33ctr-etched.step 2.0 MB You want the part with LD1117S33CTR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 495 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: STMicroelectronics datasheet (44 pp, sha256 1b80923ec6ca9161, 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