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LD1117S25CTR

Public Made by Adom

by adom

STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Contents

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LD1117S25CTR

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

LD1117S25CTR 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 reference for the fixed-voltage LD1117 (this pin is labeled ADJ/GND in the datasheet; on fixed-output versions such as the LD1117#25 it is the ground return). Connect to system ground; the output-capacitor return should share this node.
2 VOUT power_out Regulated 2.5 V output pin. Delivers up to 800 mA. Requires a minimum 10 uF capacitor to ground for loop stability. Electrically tied to the SOT-223 TAB (heatsink pad).
3 VIN power_in Unregulated DC input. Absolute maximum 15 V (18 V when IOUT < 20 mA). Dropout is ~1 V typical, so VIN must exceed VOUT + 1 V under full load. A local input decoupling capacitor is recommended.
TAB VOUT power_out Thermal/heatsink tab on the SOT-223 package. Electrically connected internally to VOUT (pin 2). Solder to a copper pour that also serves as the VOUT trace to spread heat (RthJC = 15 degC/W, RthJA = 110 degC/W for SOT-223).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LD1117S25TR
  • LD1117S25CTR
  • LD1117S25CTR-DG13
  • LD1117DT25TR
  • LD1117DT25CTR
  • LD1117V25
  • LD1117V25C

CAD (KiCad official)

  • Symbol: LD1117S25CTR
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223 (KiCad packages3D, STEP)
  • 3D model files: ld1117s25ctr-etched.step / ld1117s25ctr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ld1117s25ctr.step / ld1117s25ctr.glb are the bare package body.

Provenance

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

  • Datasheet: STMicroelectronics datasheet (46 pp, sha256 eb9bdaeee6a99a12, 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