RT8279GSP from Richtek Tech, in a SOP-8-EP-150mil. 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	BOOT	power_in	High Side Gate Drive Boost Input. Supplies drive for the high-side N-MOSFET switch. Connect a 10nF (or greater) capacitor from SW to BOOT to power the high side switch. Absolute max (VSW-0.3V) to (VSW+6V).
2	NC	unconnected	No Internal Connection.
3	NC	unconnected	No Internal Connection.
4	FB	input	Feedback Input. Connect to a resistor divider from VOUT to set the output voltage. Feedback threshold is 1.222V (typ, VREF).
5	EN	input	Enable Input. Digital input that turns the regulator on/off. VIH > 1.4V turns the regulator on; VIL < 0.4V turns it off. Leave floating for automatic startup (has ~1µA internal pull-up). Absolute max 6V.
6	GND	power_in	Ground. Pins 6 and 9 (exposed pad) are the device ground. The exposed pad must be soldered to a large PCB copper area connected to GND for maximum power dissipation.
7	VIN	power_in	Power Input, 5.5V to 36V operating range (absolute max 40V). Bypass with a suitable large capacitor from VIN to GND to eliminate input noise.
8	SW	power_out	Power Switching Output. Connect to the inductor and to the BOOT bootstrap capacitor (a capacitor from SW to BOOT is required to power the high side switch). Absolute max -0.3V to VIN+0.3V.
9	GND	power_in	Exposed thermal pad. Electrically connected to GND (pin 6). Must be soldered to a large PCB copper area for thermal dissipation.

Key specifications

Parameter	Value
Manufacturer	Richtek Tech
Package	SOP-8-EP-150mil
Category	PMIC
Pins	9

Ordering variants

Same part, different packaging or reel option.

RT8279GSP

CAD (KiCad official)

Symbol: RT8279GSP
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8-EP-150mil (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`rt8279gsp.step`	125 KB	You want the bare part, or you mark your own boards.
`rt8279gsp-etched.step`	2.2 MB	You want the part with `RT8279GSP` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 532 faces against 152 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: Richtek Tech datasheet (14 pp, sha256 d5cade8157c32c80, 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