AL1663RS-13 from Diodes Incorporated, in a SO-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	NC	unconnected	Not connected. On AL1663R this pin is unused (the AL1663 variant assigns APWM here instead).
2	FB	input	Feedback voltage sensing input from the transformer auxiliary winding. Used for output voltage reflection sensing, OVP and constant-current regulation. FB CV threshold ~1.5 V; absolute max -0.3 to 7 V.
3	CS	input	Current sense pin. Connect to the source of the primary switch through a sense resistor Rcs. Cycle-by-cycle over-current clamp Vcs_ocp ~1.2 V; internal reference 0.3 V. Absolute max -0.3 to 7 V.
4	GND	power_in	Device ground reference for all internal circuitry and the gate driver return.
5	OUT	output	Gate driver output for the external primary-side power MOSFET. Output clamp voltage ~14 V (at Vcc=20 V); rise/fall times ~90/30 ns into 1 nF; absolute max -0.3 to 20 V.
6	VCC	power_in	Supply voltage for the gate driver and internal control circuits. Startup threshold Vcc_th ~18.5 V, minimum operating voltage Vopr_min ~7.8 V, Vcc OVP ~27 V. Absolute max -0.3 to 30 V.
7	COMP	passive	Loop compensation pin. External Rcomp/Ccomp network from COMP to GND sets loop dynamics and pre-charges Vcomp_st = 1.4 V − 700 µA·Rcomp at startup.
8	APWM	input	Analog dimming input or PWM signal input for PWM dimming mode. A 0.3-2.4 V DC selects analog dimming; a digital PWM signal selects PWM dimming. Vapwm_L max 0.3 V, Vapwm_H min 2.4 V; absolute max -0.3 to 7 V.

Key specifications

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

Ordering variants

AL1663RS-13

CAD (KiCad official)

Symbol: AL1663RS-13
Footprint: Package_SO:TI_SO-PowerPAD-8
3D model: SO-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`al1663rs-13.step`	123 KB	You want the bare part, or you mark your own boards.
`al1663rs-13-etched.step`	2.4 MB	You want the part with `AL1663RS-13` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 572 faces against 147 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 (15 pp, sha256 fd7e0e59a41a7a6c, 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