IL9910DT-B from IKSEMICON, in a SOIC-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	VIN	power_in	Supply voltage input. Accepts 8 V to 450 V DC; absolute maximum 470 V. Feeds the internal 7.5 V linear regulator that produces VDD.
2	CS	input	LED current sense input. Connects to the external sense resistor at the source of the power MOSFET; the gate drive terminates when CS reaches the internal threshold (242-257 mV for -B variant, or as programmed at LD). Absolute range -0.3 V to VDD+0.3 V.
3	GND	power_in	Common ground / return pin for all internal circuitry.
4	GATE	output	Gate drive output for the external power MOSFET. Swings between GND and VDD (~7.5 V); VGATE(hi) ≥ 6.7 V, VGATE(lo) ≤ 0.3 V. Rise/fall time ≤ 50 ns into 500 pF. Absolute range -0.3 V to VDD+0.3 V.
5	PWM_D	input	Low-frequency PWM dimming input; can also be used as an enable input. Pulling to GND disables (shuts down) the IC (IINsd ≤ 1 mA). Internal pull-down resistance REN = 50-150 kΩ. Enable high level ≥ 2.4 V. Absolute range -0.3 V to VDD+0.3 V.
6	VDD	power_out	Internally regulated 7.0-8.0 V supply pin. Can be used as a supply voltage output for low-voltage external circuitry (IDD(ext) up to 1 mA). Bypass capacitor to GND required. VDDMAX = 13.5 V.
7	LD	input	Linear dimming input. Applying 0 V-250 mV programs the CS threshold and therefore the LED current; voltages above 250 mV do not increase output. Also used with a capacitor to VDD for soft-start ramping. Absolute range -0.3 V to VDD+0.3 V.
8	ROSC	input	Internal oscillator programming pin. Connect a resistor to GND to set the switching frequency: Fosc = 25000/(Rosc[kΩ] + 22) kHz, tunable 25-300 kHz (e.g. 1 MΩ → 20-30 kHz, 226 kΩ → 80-120 kHz).

Key specifications

Parameter	Value
Manufacturer	IKSEMICON
Package	SOIC-8
Category	LED-drv
Pins	8

Ordering variants

Same part, different packaging or reel option.

IL9910DT-B
IL9910N-B
IL9910DT-A
IL9910N-A
IL9910DT-C
IL9910N-C

CAD (KiCad official)

Symbol: IL9910DT-B
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`il9910dt-b.step`	122 KB	You want the bare part, or you mark your own boards.
`il9910dt-b-etched.step`	1.9 MB	You want the part with `IL9910DT-B` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 478 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: IKSEMICON datasheet (11 pp, sha256 ed877ebd8f7c51ec, 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