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LD1117S50CTR

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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LD1117S50CTR

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

LD1117S50CTR 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 / common return for the regulator. Also serves as the reference return for the internal 1.25 V reference.
2 VOUT power_out Regulated 5.0 V output, up to 800 mA. Requires a minimum 10 μF stability capacitor to ground. Electrically tied to the package TAB.
3 VIN power_in Unregulated input supply. Must be at least VOUT + Vdropout (~1 V typ.) above the output, up to the absolute-maximum input voltage.
4 TAB power_out Heat-dissipating tab of the SOT-223 package. Internally connected to VOUT and must be soldered to the PCB copper pour used for thermal dissipation.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LD1117S50CTR
  • LD1117S50TR
  • LD1117V50
  • LD1117DT50TR
  • LD1117D50TR
  • LD1117D2T50TR

CAD (KiCad official)

  • Symbol: LD1117S50CTR
  • 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
ld1117s50ctr.step 64 KB You want the bare part, or you mark your own boards.
ld1117s50ctr-etched.step 1.9 MB You want the part with LD1117S50CTR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 475 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