OC7140 from OCX, 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	VDD	power_in	Chip supply pin. Operating range 2.5V to 6V (absolute max 7V). Bypass with ~4.7uF capacitor placed close to the pin and GND.
2	DIM	input	PWM dimming input. Logic low turns the LED output off; logic high enables normal LED output. VIH ≥ 0.7VDD, VIL ≤ 0.3VDD. Maximum dimming frequency 10kHz (≤1kHz recommended for best linearity).
3	NC	unconnected	No connect. Leave floating.
4	LED	output	Drain of the internal 30V/50mΩ NMOS. Connect to LED cathode. Absolute max voltage 30V. The exposed ESOP-8 thermal pad is internally connected to this pin.
5	CS	input	Current-sense input. Regulates to VCS = 100mV (96-104mV) across the external sense resistor RCS; LED current = 100mV / RCS. Pins 5 and 6 are internally tied together.
6	CS	input	Current-sense input (paralleled with pin 5). Tie both pins to the top of the external sense resistor RCS.
7	NC	unconnected	No connect. Leave floating.
8	GND	power_in	Device ground reference.

Key specifications

Parameter	Value
Manufacturer	OCX
Package	SOIC-8-EP
Category	LED-drv
Pins	8

CAD (KiCad official)

Symbol: OC7140
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm
3D model: SOIC-8-EP (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`oc7140.step`	125 KB	You want the bare part, or you mark your own boards.
`oc7140-etched.step`	1.3 MB	You want the part with `OC7140` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 340 faces against 152 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: OCX datasheet (6 pp, sha256 0a9fd59080738aab, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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