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LD1117S50TR

Public Unreviewed

by Ray

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

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Contents

README

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LD1117S50TR

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-3

LD1117S50TR from STMicroelectronics, in a SOT-223-3. 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 reference for the regulator. Return path for quiescent current and load current.
2 VOUT power_out Regulated 5.0 V output. Requires a minimum 10 µF capacitor to ground for stability. Delivers up to 800 mA (typ. 950 mA) with dropout ~1.1 V at 800 mA. Internally tied to the package TAB.
3 VIN power_in Unregulated input supply. Operating input voltage up to 15 V DC (18 V max when Iout < 20 mA). A 100 nF input decoupling capacitor is recommended.
4 TAB power_out Metal tab used for heat dissipation. Electrically connected internally to VOUT - must be treated as VOUT for isolation and routing purposes.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOT-223-3
Category PMIC
Pins 4

Ordering variants

Same part, different packaging or reel option.

  • LD1117S50TR
  • LD1117S50TRV50
  • LD1117S50TRDT50TR
  • LD1117S50TRD50TR

CAD (KiCad official)

  • Symbol: LD1117S50TR
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
ld1117s50tr.step 64 KB You want the bare part, or you mark your own boards.
ld1117s50tr-etched.step 1.7 MB You want the part with LD1117S50TR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 436 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