LD1117DT50TR 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	GND	power_in	Device ground reference. Return path for the regulator's quiescent current; the fixed output voltage is developed relative to this pin.
2	VOUT	power_out	Regulated 5.0 V fixed output. Supplies up to 800 mA continuous with 1 V typical dropout. Requires a minimum 10 µF capacitor to ground for stability. Electrically tied to the exposed DPAK tab.
3	VIN	power_in	Unregulated DC input supply. Recommended operating range is VOUT + dropout up to 15 V (18 V absolute max when IOUT < 20 mA). A 100 nF input decoupling capacitor is recommended close to the pin.
TAB	VOUT	power_out	Exposed thermal tab, electrically connected to VOUT. Used for heat sinking to reduce thermal resistance junction-to-ambient.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

LD1117DT50TR
LD1117DT50TRS50TR
LD1117DT50TRS50
LD1117DT50TRD50TR
LD1117DT50TRD50
LD1117DT50TRV50

CAD (KiCad official)

Symbol: LD1117DT50TR
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 (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