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LD1117AS12TR

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STMicroelectronics Dropout Regulators(LDO), SOT-223. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

componentpower management icsld1117as12tr
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Contents

README

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LD1117AS12TR

STMicroelectronics · Dropout Regulators(LDO) · SOT-223

LD1117AS12TR 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 ADJ/GND power_in Ground reference for the fixed-output versions (LD1117AS12 uses this pin as GND). On adjustable versions this same pin is the ADJ feedback input tied to a resistor divider from VOUT (VREF = 1.25 V typ.).
2 VOUT power_out Regulated 1.2 V output (±2% at 25 °C, ±4% over full temperature). Delivers up to 1 A; requires ≥10 µF output capacitance for stability. The SOT-223 tab is internally connected to this pin.
3 VIN power_in Unregulated DC input, up to 15 V absolute maximum (10 V operating). Requires at least VOUT + VDROPOUT (~1.15 V at 1 A) for regulation. A 100 nF input decoupling capacitor is recommended.
TAB VOUT power_out Metal tab / thermal pad on the SOT-223 back side, internally connected to VOUT. Used for heatsinking to the PCB copper pour.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOT-223
Category Power Management ICs
Pins 4

Ordering variants

Same part, different packaging or reel option.

  • LD1117AS12TR
  • LD1117AS12TRAS18TR
  • LD1117AS12TRAS33TR
  • LD1117AS12TRASTR
  • LD1117AS12TRADT12TR
  • LD1117AS12TRADT18TR
  • LD1117AS12TRADT33TR
  • LD1117AS12TRADT-TR
  • LD1117AS12TRAV33

CAD (KiCad official)

  • Symbol: LD1117AS12TR
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223 (KiCad packages3D, STEP)
  • 3D model files: ld1117as12tr-etched.step / ld1117as12tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ld1117as12tr.step / ld1117as12tr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (24 pp, sha256 c2dd41daa75f2827, retrieved 2026-08-17, tier: lcsc)
  • 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