SCT2A10STER 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	GND	power_in	Ground return for the device. Must be tied to the PCB ground plane and connected together with the thermal pad for proper operation and thermal performance.
2	VIN	power_in	Input supply voltage, 4.5V to 85V operating range (absolute max 90V). Requires a local high-frequency bypass capacitor to GND placed as close as possible to the pin.
3	EN	input	Enable input with internal pull-up current source (~1-4µA). Pull below 1.1V to disable the converter; float or drive to VIN to enable. A resistor divider from VIN to GND on EN programs the input UVLO threshold (VEN_H≈1.21V, VEN_L≈1.05V).
4	RT	input	Switching frequency programming pin. A resistor from RT to GND sets the internal oscillator frequency from 300kHz to 800kHz (e.g. RRT=500kΩ ≈500kHz). An external clock may be applied directly to RT/CLK to synchronize the internal PLL; if the external clock stops, operation reverts to the resistor-programmed frequency.
5	FB	input	Inverting input of the transconductance error amplifier. Connect the tap of the external output-to-GND resistor divider here; the device regulates FB to VREF = 0.8V typical (±1%).
6	NC	unconnected	No internal connection. May be left floating or tied to GND.
7	BST	passive	Bootstrap supply for the high-side MOSFET gate driver. Connect a 0.1µF ceramic capacitor from BST to SW; the cap is recharged from an internal rail whenever the low-side MOSFET is on or SW is low. BOOT-SW absolute max is 6V.
8	SW	output	Switching node, output of the internal high-side/low-side MOSFET half-bridge. Connect to the external power inductor; also serves as the return for the bootstrap capacitor. Absolute max -1V to 90V.
9	Thermal Pad	power_in	Exposed thermal pad on the bottom of the ESOP-8 package. Primary heat dissipation path from the die. Must be soldered to the PCB ground plane and electrically connected to the GND pin for proper operation and optimized thermal performance.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SCT2A10STER

CAD (KiCad official)

Symbol: SCT2A10STER
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 (18 pp, sha256 864935163937d99b, 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