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LD1117DTTR

Public Unreviewed

by Ray

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

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Symbol & Footprint

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Contents

README

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LD1117DTTR

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

LD1117DTTR from STMicroelectronics, in a DPAK. 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 input Ground pin on fixed-output variants; feedback/adjust pin on the adjustable LD1117 variant (tied to a resistor divider from V_OUT to set the output voltage against the internal 1.25 V reference).
2 VOUT power_out Regulated output voltage, up to 800 mA. TAB is internally connected to V_OUT; requires ≥10 µF output capacitor for stability.
3 VIN power_in Unregulated input supply. Must be at least V_OUT + ~1 V (typical dropout) up to the absolute maximum V_I rating.
TAB VOUT power_out Metal thermal TAB on the DPAK package; internally connected to V_OUT (per datasheet note on page 6). Used to conduct heat into the PCB copper pour tied to the regulator output net.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package DPAK
Category PMIC
Pins 4

Ordering variants

Same part, different packaging or reel option.

  • LD1117DTTR
  • LD1117DTTRDT-TR
  • LD1117DTTRV
  • LD1117DTTRVXX
  • LD1117DTTRS
  • LD1117DTTRSTR
  • LD1117DTTRD
  • LD1117DTTRDTR

CAD (KiCad official)

  • Symbol: LD1117DTTR
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: DPAK (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
ld1117dttr.step 119 KB You want the bare part, or you mark your own boards.
ld1117dttr-etched.step 1.2 MB You want the part with LD1117DTTR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 350 faces against 83 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 (46 pp, sha256 eb9bdaeee6a99a12, 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