SY8120IABC from Silergy Corp, in a SOT-23-6. 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	BS	passive	Boot-strap pin. Supplies the high-side gate driver. Connect a 0.1µF ceramic capacitor between BS and LX pin.
2	GND	power_in	Power ground pin. Return path for the low-side switch and internal control circuitry.
3	FB	input	Output feedback pin. Connect to the center point of the output resistor divider to program VOUT via VOUT = 0.6V × (1 + RH/RL). Internal reference is 0.6V (591-609mV).
4	EN	input	Enable control input. Pull high to turn the regulator on; do not leave floating. Rising threshold typ. 1.2V, falling threshold typ. 1.0V.
5	IN	power_in	Input supply pin. Operating range 4.2V to 18V (absolute max 19V). Decouple to GND with at least a 10µF ceramic capacitor.
6	LX	power_out	Inductor / switching node pin. Connect to the switching node of the external inductor. Delivers up to 2A of output current.

Key specifications

Parameter	Value
Manufacturer	Silergy Corp
Package	SOT-23-6
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

SY8120IABC

CAD (KiCad official)

Symbol: SY8120IABC
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sy8120iabc.step`	97 KB	You want the bare part, or you mark your own boards.
`sy8120iabc-etched.step`	2.1 MB	You want the part with `SY8120IABC` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 505 faces against 117 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 (13 pp, sha256 fe442b4bdc3e6b39, 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