SCT9339STER from SCT, in a ESOP-8. 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	passive	Bootstrap supply for the high-side power MOSFET gate driver. Connect a 0.1uF (or greater) ceramic capacitor between BOOT and SW to generate the boosted gate-drive voltage.
2	VIN	power_in	Power supply input, 3.8V to 28V. Must be locally bypassed with a ceramic capacitor close to the pin.
3	EN	input	Enable logic input. Floating the pin enables the device; supports high-voltage input up to VIN so it can be tied directly to VIN for auto-enable. Precision thresholds of 1.18V rising / 1.1V falling allow programmable UVLO via a resistor divider.
4	NC	unconnected	No internal connection. Leave floating or tie to a convenient node.
5	FB	input	Buck converter output feedback sensing input. Connect a resistor divider from VOUT to FB to program the output voltage; the device regulates FB to the internal 0.8V (±1%) reference.
6	NC	unconnected	No internal connection. Leave floating or tie to a convenient node.
7	NC	unconnected	No internal connection. Leave floating or tie to a convenient node.
8	SW	power_out	Switching node of the buck converter. Connect to the external inductor; also serves as the bootstrap capacitor return reference for the BOOT pin.
9	GND (Thermal Pad)	power_in	Exposed thermal pad on the bottom of the ESOP-8 package. Serves as device ground and the heat-dissipation path; must be soldered to the PCB ground plane for proper operation and thermal performance.

Key specifications

Parameter	Value
Manufacturer	SCT
Package	ESOP-8
Category	PMIC
Pins	9

Ordering variants

Same part, different packaging or reel option.

SCT9339STER

CAD (KiCad official)

Symbol: SCT9339STER
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm
3D model: ESOP-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: SCT datasheet (19 pp, sha256 d8867bdb12241602, retrieved 2026-08-17, tier: lcsc)
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