LD1117DT33TR from STMicroelectronics, in a TO-252-2. 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. Reference for both the input and 3.3 V output.
2	VOUT	power_out	Regulated 3.3 V output, up to 800 mA. Requires a 10 µF minimum output capacitor for loop stability. Electrically tied to the DPAK TAB.
3	VIN	power_in	Unregulated DC input, 4.3 V to 15 V typical (absolute max 15 V continuous, 18 V with IOUT < 20 mA). A 100 nF input decoupling capacitor is recommended.
TAB	VOUT	power_out	DPAK metal tab, electrically connected to VOUT. Serves as the primary heat-sinking path (RthJC = 8 °C/W).

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	TO-252-2
Category	PMIC
Pins	4

Ordering variants

Same part, different packaging or reel option.

LD1117DT33TR
LD1117DT33-TR
LD1117DT33TRS33TR
LD1117DT33TRD33TR
LD1117DT33TRV33

CAD (KiCad official)

Symbol: LD1117DT33TR
Footprint: Package_TO_SOT_SMD:TO-252-2
3D model: TO-252-2 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ld1117dt33tr.step`	119 KB	You want the bare part, or you mark your own boards.
`ld1117dt33tr-etched.step`	1.7 MB	You want the part with `LD1117DT33TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 464 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 (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