OB3353ACPA from OB On Bright Elec, 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 supply input. Recommended operating range 9V to 30V (abs max 33V). UVLO turn-off threshold ~8.3V with 800mV hysteresis.
2	GATE	output	Gate driver output pin for the external boost power MOSFET. Rise time ~40 ns and fall time ~20 ns into a 1 nF load.
3	GND	power_in	Device ground reference for all internal circuitry and the gate driver return.
4	CS	input	Current sense input from the external sense resistor at the MOSFET source. Used for current-mode PWM control; OCP threshold ~380 mV @ 90% duty. Diode/inductor short protection triggers at VTH_CS ~1.2 V.
5	FB	input	LED current feedback input. Voltage across the LED current sense resistor is regulated to the internal 400 mV reference (Vref_ea).
6	COMP	output	Boost converter loop compensation pin. Transconductance error amplifier output (Gm ~100 uA/V); tie an RC network to GND to set loop dynamics. VTH_CMP ~3.2 V flags FB-short-to-GND.
7	OVP	input	Over-voltage protection sense input. Trips when VOVP_OV ~2.0 V is reached (typically via a resistor divider from the boost output). OVP UVLO thresholds 250 mV (normal) / 150 mV (startup).
8	PWM	input	PWM signal input for PWM-to-analog dimming control. Logic-high >= 2.5 V, logic-low <= 1.3 V, duty 0-100%, recommended frequency 5-50 kHz.

Key specifications

Parameter	Value
Manufacturer	OB On Bright Elec
Package	SOP-8
Category	LED-drv
Pins	8

Ordering variants

Same part, different packaging or reel option.

OB3353ACPA
OB3353ACPAAKFP
OB3353ACPAAKFPA

CAD (KiCad official)

Symbol: OB3353ACPA
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
`ob3353acpa.step`	122 KB	You want the bare part, or you mark your own boards.
`ob3353acpa-etched.step`	2.4 MB	You want the part with `OB3353ACPA` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 579 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: OB On Bright Elec datasheet (12 pp, sha256 592275a8a3fd0ee1, 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