OC6701B from OCX, 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	GND	power_in	Device ground return. Connect to system ground.
2	EN	input	Chip enable, active high. Logic-high threshold >= 0.4*VDD, logic-low <= 0.8V. Can be driven with a PWM signal for LED dimming.
3	COMP	output	Error amplifier output / loop-compensation node. Connect an external R-C network to ground to set frequency compensation of the current loop.
4	FB	input	Output LED-current feedback sense input. Regulates to VFB = 250mV (typ, 240-260mV) across an external sense resistor RFB; ILED = 0.25V / RFB.
5	DRV	output	Gate-drive output for the external N-channel power MOSFET. Typical drive level 5.5V; rise/fall ~50ns into 500pF. Choose a MOSFET with low RDSON at VGS=5.5V and Vth <= 2.5V.
6	CS	input	Switch/inductor peak-current sense input for cycle-by-cycle peak current control and input over-current protection. Trip threshold VCS_TH = 250mV (typ, 240-260mV); IPK <= 0.25V / RCS.
7	TOFF	input	Fixed off-time programming pin. TOFF = 0.51 * 150k * (COFF + 7.3pF) + 61ns via external capacitor COFF (recommend 22-33pF or larger). Left open, internal off-time defaults to 620ns.
8	VDD	power_in	Chip supply pin, fed from VIN through an external dropper resistor RVDD. Internal shunt regulator clamps VDD to 5.5V (IVDD < 10mA); UVLO rising 2.6V with 0.3V hysteresis. Typical operating current 1.3mA at 200kHz, 200uA in standby.

Key specifications

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

CAD (KiCad official)

Symbol: OC6701B
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
`oc6701b.step`	122 KB	You want the bare part, or you mark your own boards.
`oc6701b-etched.step`	1.7 MB	You want the part with `OC6701B` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 412 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: OCX datasheet (8 pp, sha256 bc5762ea6dc6d18a, 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