SY8089AAAC 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 (>1.5V) to turn on the regulator; pull low (<0.4V) to shut down (Ishdn ~0.1µA). Do not float; add a 1MΩ pull-down to GND if the driving source can go high-Z.
2	GND	power_in	Ground return pin. Maximize copper area for best thermal and noise performance; keep CIN loop area to IN/GND minimal.
3	LX	power_out	Switching node output; connect to the external inductor (typ. 2.2µH). Internal PFET (110mΩ) sources to VIN and NFET (80mΩ) sinks to GND; peak current limit 3.5A. Minimize PCB copper area on this node to reduce switching noise.
4	IN	power_in	Supply input, 2.7V to 5.5V (abs max 6.0V). Decouple to GND with at least a 10µF (typ. 22µF) X5R/X7R ceramic capacitor placed close to the IN and GND pins.
5	FB	input	Output voltage feedback input. Connect to the mid-point of the R1/R2 output divider to program Vout = 0.6V × (1 + R1/R2). Reference is 0.6V (±2%); IFB ±50nA. Keep FB trace away from the LX net.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SY8089AAAC
SY8089AAC

CAD (KiCad official)

Symbol: SY8089AAAC
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
`sy8089aaac.step`	85 KB	You want the bare part, or you mark your own boards.
`sy8089aaac-etched.step`	2.2 MB	You want the part with `SY8089AAAC` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 515 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 (10 pp, sha256 be137413d9493bb7, 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