LR8341A-M33 from LR, in a SOT-89-3. 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	VSS	power_in	Ground / negative supply reference. All voltages in the datasheet are referenced to this pin. Connect directly to the system ground plane; the SOT-89-3 tab is also tied to this pin for thermal dissipation.
2	VIN	power_in	Unregulated supply input, up to 40V operating (55V absolute max). Bypass with capacitor C1 to VSS close to the pin. Must be ≥ VOUT + dropout (typ. 750mV at 100mA).
3	VOUT	power_out	Regulated 3.3V output (±2% tolerance) capable of sourcing up to 100mA continuous (160mA absolute max). Bypass with output capacitor C2 to VSS. Internally short-circuit protected (~15mA short-circuit current when VOUT is shorted to GND).

Key specifications

Parameter	Value
Manufacturer	LR
Package	SOT-89-3
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

LR8341A-M33
LR8341A-M33T33

CAD (KiCad official)

Symbol: LR8341A-M33
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lr8341a-m33.step`	57 KB	You want the bare part, or you mark your own boards.
`lr8341a-m33-etched.step`	1.7 MB	You want the part with `LR8341A-M33` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 446 faces against 42 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: LR datasheet (13 pp, sha256 0ef57f5e903211ad, retrieved 2026-08-17, tier: lcsc)
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