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LD1117ADT33TR

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by Ray

STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-252-2(DPAK). Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Datasheet

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Contents

README

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LD1117ADT33TR

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252-2(DPAK)

LD1117ADT33TR from STMicroelectronics, in a TO-252-2(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 power_in Ground reference for the fixed-output version (this LD1117ADT33TR is the 3.3 V fixed variant, so this pin is the GND return). On adjustable variants (LD1117ADT-TR) the same pin becomes ADJ, sensing the external resistor-divider node against the internal 1.25 V reference.
2 VOUT power_out Regulated 3.3 V output (LD1117ADT33TR trimmed to ±2% at 25 °C, ±4% over full temperature range). Delivers up to 1 A; requires ≥10 µF output capacitor for stability. Pin 2 is electrically tied to the DPAK TAB (heatsink pad).
3 VIN power_in Unregulated DC input supply, max 15 V absolute (10 V operating). For a 3.3 V output, VIN must exceed VOUT + VD (VD_typ ≈ 1.15 V at 1 A, 1.0 V at 100 mA). A 100 nF input capacitor is recommended.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package TO-252-2(DPAK)
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • LD1117ADT33TR
  • LD1117ADT12TR
  • LD1117ADT18TR
  • LD1117ADT-TR
  • LD1117AS33TR
  • LD1117AS12TR
  • LD1117AS18TR
  • LD1117ASTR
  • LD1117AV33

CAD (KiCad official)

  • Symbol: LD1117ADT33TR
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: STMicroelectronics datasheet (24 pp, sha256 c2dd41daa75f2827, 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