LD1117DT33CTR 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	GND	power_in	Ground / reference return for the regulator. On the fixed-voltage (LD1117-33) versions this pin serves as the device ground; on the adjustable LD1117 the same pin is the ADJ (feedback) input tied to VREF = 1.25 V.
2	VOUT	power_out	Regulated 3.3 V output. Supplies up to 800 mA (typ. 950 mA, max 1300 mA) at Vin − Vout = 5 V, TJ = 25 °C. A minimum 10 µF output capacitor is required for loop stability.
3	VIN	power_in	Unregulated DC input supply. Operating input voltage up to 15 V; absolute maximum 15 V (18 V permitted only when IOUT < 20 mA). A 100 nF input decoupling capacitor is recommended.
TAB	VOUT	power_out	Exposed metal tab used as the primary thermal path. Electrically connected to VOUT internally, so any heatsink/copper pour on the tab is at the regulated output potential (not ground).

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	DPAK
Category	PMIC
Pins	4

Ordering variants

Same part, different packaging or reel option.

LD1117DT33CTR
LD1117DT33TR
LD1117DT33CTRS33TR
LD1117DT33CTRS33CTR
LD1117DT33CTRV33
LD1117DT33CTRV33C
LD1117DT33CTRD33TR
LD1117DT33CTRD33CTR

CAD (KiCad official)

Symbol: LD1117DT33CTR
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
`ld1117dt33ctr.step`	119 KB	You want the bare part, or you mark your own boards.
`ld1117dt33ctr-etched.step`	1.9 MB	You want the part with `LD1117DT33CTR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 506 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