SM8081AAC from Silergy Corp, in a SOT-23-5. 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	EN	input	Enable control input. Pull high (VEN,H ≥ 1.2V) to turn the regulator on; pull low (VEN,L ≤ 0.4V) to shut down. Do not leave floating. Absolute max VIN + 0.6V.
2	GND	power_in	Device ground. Connect to system ground plane; return path for input/output capacitors and internal low-side switch.
3	LX	output	Switching node. Connect to the external inductor. Internal top (PMOS) and bottom (NMOS) power switches meet at this pin. Absolute max −0.3V to 6.0V (transient −3V/+7V <40ns). Also case position for θJC.
4	IN	power_in	Input supply pin, 2.5V to 5.5V operating (6.0V abs max). Decouple to GND with at least a 10µF ceramic capacitor placed close to the pin.
5	FB	input	Output feedback pin. Connect to the mid-point of the external resistor divider to program VOUT: VOUT = 0.6V × (1 + RH/RL). Internal reference VREF = 0.6V (typ).

Key specifications

Parameter	Value
Manufacturer	Silergy Corp
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

SM8081AAC

CAD (KiCad official)

Symbol: SM8081AAC
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sm8081aac.step`	85 KB	You want the bare part, or you mark your own boards.
`sm8081aac-etched.step`	2.0 MB	You want the part with `SM8081AAC` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 472 faces against 102 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: Silergy Corp datasheet (11 pp, sha256 483036b5aca04853, 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