SM2082G from Shenzhen Sunmoon Micro, in a SOT-89. 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	OUT	power_in	Power input and constant-current output terminal. Sinks the regulated LED string current; withstands up to 450 V absolute maximum and typically requires VOUT_MIN of 4.1-5.5 V (at 20-50 mA) to maintain regulation.
2	GND	power_in	Chip ground reference. All internal circuitry and the Rext current-setting resistor return to this pin.
3	REXT	input	Output-current programming pin. Connect an external resistor Rext from this pin to GND to set the LED current: Iout = 0.6 V / Rext, giving 5 mA-60 mA. Typical VREXT = 0.6 V at VOUT = 10 V.

Key specifications

Parameter	Value
Manufacturer	Shenzhen Sunmoon Micro
Package	SOT-89
Category	LED-drv
Pins	3

Ordering variants

Same part, different packaging or reel option.

SM2082G (SOT89-3)
SM2082G (SOT223)
SM2082G (TO252-2)

CAD (KiCad official)

Symbol: SM2082G
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sm2082g.step`	57 KB	You want the bare part, or you mark your own boards.
`sm2082g-etched.step`	1.3 MB	You want the part with `SM2082G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 351 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: Shenzhen Sunmoon Micro datasheet (13 pp, sha256 0d948a908ac0aa81, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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