SY8089A1AAC 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 on the regulator; drive low (VEN,L ≤ 0.4V) to shut down (ISHDN ~0.1µA). Do not leave floating; add a 1MΩ pull-down to GND if driven by a high-Z source.
2	GND	power_in	Ground reference for the IC. Connect to the system ground plane with a low-impedance path; the CIN loop between IN and GND must be minimized.
3	LX	output	Switching node output of the internal high-side/low-side FET bridge. Connect to the external inductor (e.g. 1.0µH). Rated -0.3V to 6.0V (transient -3V/+7V <40ns). Minimize PCB copper area on this net to reduce EMI.
4	IN	power_in	Power supply input, 2.5V to 5.5V (abs max 6.0V). Decouple to GND with at least a 10µF X5R (or better) ≥6.3V ceramic capacitor placed close to the pin.
5	FB	input	Output voltage feedback input. Connect to the midpoint of the RH/RL divider from VOUT to GND to program VOUT = 0.6V × (1 + RH/RL). Internal reference is 600mV (591-609mV). A feed-forward cap (e.g. 22pF) across RH improves transient response.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SY8089A1AAC

CAD (KiCad official)

Symbol: SY8089A1AAC
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
`sy8089a1aac.step`	85 KB	You want the bare part, or you mark your own boards.
`sy8089a1aac-etched.step`	2.2 MB	You want the part with `SY8089A1AAC` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 539 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 8587214d50cc945a, 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