AL8843QSP-13 from Diodes Incorporated, in a SOIC-8-EP. 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 of IC. Tie to system ground plane.
2	GND	power_in	Ground of IC. Primary conducted-heat return path; connect to a maximum earth plane with thermal vias to minimize self-heating.
3	SET	input	Set Nominal Output Current pin. Connect an R_SET resistor from this pin to VIN to define the nominal average LED current; mean current-sense threshold is 100mV (typ) referenced to VIN. Absolute max voltage +42V.
4	NC	unconnected	No Connection. Leave floating or tie to GND for mechanical support.
5	CTRL	input	Multi-function on/off, analog and PWM brightness control, and soft-start pin. Float for normal operation; drive <0.3V to shut down output; DC voltage 0.4V-2.5V adjusts output current from 10%-100%; >2.6V gives 100% I_OUT_NOM; also accepts a PWM signal (V_L<0.3V, V_H>2.6V, edges <1us). A capacitor from CTRL to GND sets additional soft-start time (~1.5ms/nF over the 0.1ms default). Absolute max +6V.
6	VIN	power_in	Input voltage supply, 4.5V-40V (absolute max +42V). Decouple to GND with a 10uF or larger X7R ceramic capacitor placed close to the device.
7	SW	output	Switch pin - drain of the internal 40V NMOS power switch (R_ON ~0.2Ω @ 100mA). Connect the inductor and freewheeling diode here; minimize track length to reduce EMI.
8	SW	output	Switch pin - internally tied to pin 7 (drain of internal 40V NMOS power switch). Connect the inductor and freewheeling diode here; minimize track length to reduce EMI.
EP	EP	passive	Exposed pad / thermal tab on package bottom. Connect to GND and to a thermal copper mass for enhanced thermal impedance (θJA = 45°C/W with recommended layout).

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SOIC-8-EP
Category	LED-drv
Pins	9

Ordering variants

Same part, different packaging or reel option.

AL8843QSP-13

CAD (KiCad official)

Symbol: AL8843QSP-13
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm
3D model: SOIC-8-EP (KiCad packages3D, STEP)

Provenance

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

Datasheet: Diodes Incorporated datasheet (18 pp, sha256 1c5463a652278ea6, 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