NDP3810KC from NDP, in a SOP-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	Power input. Wide operating range 7V to 100V (absolute max VIN to GND -0.3V to 105V). Supplies the internal UVLO/regulator; decouple close to pin (e.g. 47uF).
2	DIM	input	PWM/Analog dimming input. VDIM < 0.1V turns the chip off; 0.1V-1.5V gives analog dimming (0-100% ILED); >1.5V gives full current. For PWM dimming amplitude must exceed 1.5V; recommended frequency 0.1-20 kHz. Do not leave floating (no internal pull-up/down).
3	VDD	power_out	Internal regulator output / internal power supply rail (typ 5.7V, max 6.5V). Bypass to GND with a small ceramic (e.g. 1uF). Not intended to power external loads.
4	CS	input	Current-sense input. Connect the sense resistor from CS to GND to measure MOSFET/LED current; internal regulation target is VCS ~280mV (270-290mV). RSENSE = 280mV / ILED. Absolute max 0.3V to +7V.
5	SW	output	Power switch node - drain of the internal high-voltage NMOS (BVDSS 100V, RDSON ~420mΩ). Tie to inductor/Schottky in the step-down stage. Pins 5 and 6 are internally the same SW node.
6	SW	output	Power switch node - drain of the internal high-voltage NMOS. Pins 5 and 6 are internally the same SW node; parallel them for current handling and thermal spreading.
7	RT	input	NMOS off-time setting. Connect a resistor from RT to GND to program the constant off-time and thus the switching frequency; recommended 100kΩ-300kΩ for a typical 100kHz-300kHz. Absolute max -0.3V to +7V.
8	GND	power_in	Device ground / return for internal reference, regulator, and current-sense comparator. Reference for VIN, VDD, DIM, RT, and CS.

Key specifications

Parameter	Value
Manufacturer	NDP
Package	SOP-8
Category	LED-drv
Pins	8

Ordering variants

Same part, different packaging or reel option.

NDP3810KC

CAD (KiCad official)

Symbol: NDP3810KC
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ndp3810kc.step`	122 KB	You want the bare part, or you mark your own boards.
`ndp3810kc-etched.step`	2.0 MB	You want the part with `NDP3810KC` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 498 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: NDP datasheet (6 pp, sha256 9401aaaa92be0c77, 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