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LD1117S33TR

Public Unreviewed

by Ray

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

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Contents

README

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LD1117S33TR

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

LD1117S33TR from STMicroelectronics, in a SOT-223. 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 Ground / regulator common return. 0 V reference for VIN and VOUT.
2 VOUT power_out Regulated 3.3 V output, up to 800 mA. Requires a 10 µF minimum capacitor to ground for loop stability. Electrically connected to the SOT-223 tab.
3 VIN power_in Unregulated DC input supply. Recommended 100 nF bypass to GND. Absolute maximum 15 V (18 V when IOUT < 20 mA); must exceed VOUT by ~1 V (typical dropout) at full load.
4 TAB power_out Metal heat-spreader tab, internally bonded to VOUT. Solder to a copper pour for thermal dissipation; the pour is at VOUT potential and must be treated as such.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LD1117S33TR
  • LD1117S33TRDT33TR
  • LD1117S33TRD33TR
  • LD1117S33TRV33

CAD (KiCad official)

  • Symbol: LD1117S33TR
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
ld1117s33tr.step 64 KB You want the bare part, or you mark your own boards.
ld1117s33tr-etched.step 1.8 MB You want the part with LD1117S33TR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 456 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