LF33CDT-TR 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	INPUT	power_in	Unregulated DC input supply. Absolute maximum 40 V (regulator enters shutdown for 18 V < VI < 40 V). Typical operating input for a 3.3 V output requires VI ≥ VOUT + 0.45 V dropout. Bypass with 0.1 µF.
2	GND	power_in	Ground reference. The DPAK tab is electrically connected to GND and provides the primary thermal path (RthJC = 8 °C/W).
3	OUTPUT	power_out	Regulated 3.3 V output, up to 500 mA. Requires a 2.2 µF electrolytic output capacitor for loop stability. Internally protected against overcurrent and thermal overload.
TAB	GND	power_in	Exposed metal tab, electrically bonded to GND (pin 2). Solder to a copper pour for heat dissipation; RthJC = 8 °C/W, RthJA = 100 °C/W.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

LF33CDT-TR
LF33CDT-TRY
LF33ABDT-TR
LF33CPT-TR
LF33CPT-TRY
LF33CV
LF33CV-DG
LF33ABV
LF33ABV-DG

CAD (KiCad official)

Symbol: LF33CDT-TR
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 (53 pp, sha256 307003c143a6294f, 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