AL8843SP-13 from Diodes Incorporated, in a SO-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; internally connected to pin 2 and exposed pad.
2	GND	power_in	Ground of IC. Tie to system ground plane; internally connected to pin 1 and exposed pad.
3	SET	input	Set nominal output current pin. Connect resistor R_SET from this pin to VIN to define the nominal average output current. Mean current-sense threshold V_SET typ 100mV (96-104mV) with respect to VIN; I_SET typ 8µA.
4	NC	unconnected	No connection. Leave floating or tie to ground for best noise immunity.
5	CTRL	input	Multi-function On/Off and brightness control input. Leave floating for normal operation. Drive below 0.3V to shut down the power switch. Analog dim by applying 0.4V-2.5V DC (10%-100% of I_OUT_NOM); >2.6V gives 100%. Accepts PWM (low <0.3V, high >2.6V, edges <1µs). A capacitor from CTRL to GND increases soft-start time (default t_SS ≈ 0.1ms; adds ~1.5ms/nF).
6	VIN	power_in	Input supply voltage, 4.5V to 40V (abs max 42V). Decouple to ground with a 10µF or higher X7R ceramic capacitor placed close to the device. UVLO rising typ 3.9V with 250mV hysteresis.
7	SW	output	Switch node - drain of the internal 40V NDMOS high-side switch (R_ON typ 0.2Ω). Connect the inductor and freewheeling Schottky diode here, minimizing track length to reduce EMI. Internally tied to pin 8.
8	SW	output	Switch node - drain of the internal 40V NDMOS high-side switch. Connect the inductor and freewheeling Schottky diode here, minimizing track length to reduce EMI. Internally tied to pin 7.
EP	EP	power_in	Exposed pad / thermal tab. Connects to GND and to the PCB thermal mass for enhanced thermal impedance. Solder to a copper pour tied to ground.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

AL8843SP-13

CAD (KiCad official)

Symbol: AL8843SP-13
Footprint: Package_SO:Diodes_SO-8EP
3D model: SO-8-EP (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`al8843sp-13.step`	194 KB	You want the bare part, or you mark your own boards.
`al8843sp-13-etched.step`	2.1 MB	You want the part with `AL8843SP-13` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 527 faces against 63 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: Diodes Incorporated datasheet (16 pp, sha256 b544c47b8437fba0, 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