NCP1351BDR2G from onsemi, 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	FB	input	Feedback input. Sinking current out of this pin (typically via an optocoupler collector) reduces the switching frequency by extending the off time. Internally biased through a 40 uA pull-up from VDD.
2	Ct	passive	Oscillator frequency timing pin. An external capacitor to GND sets the maximum switching frequency (fixed T_ON) obtained at no feedback current.
3	CS	input	Current sense input. Senses the primary MOSFET current via a sense resistor using the negative-sensing technique, with a programmable peak-voltage threshold.
4	GND	power_in	Device ground / analog return for all internal circuitry.
5	DRV	output	Gate driver output. Delivers driving pulses directly to the external power MOSFET gate.
6	VCC	power_in	Supply input for the controller. Accepts up to 28 V with an internal clamp/UVLO management block (V_CCSTOP monitored).
7	LATCH	input	Latch-off input. Driving a voltage above V_LATCH on this pin fully latches off the controller (dedicated OTP/OVP input).
8	TIMER	passive	Fault timer capacitor. An external capacitor sets the fault-validation timeout during which feedback activity/overload is monitored before shutdown or auto-recovery is triggered.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	SOIC-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

NCP1351BDR2G
NCP1351BDR2GPG

CAD (KiCad official)

Symbol: NCP1351BDR2G
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
`ncp1351bdr2g.step`	122 KB	You want the bare part, or you mark your own boards.
`ncp1351bdr2g-etched.step`	2.5 MB	You want the part with `NCP1351BDR2G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 616 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: onsemi datasheet (30 pp, sha256 96cd46ad00515b08, retrieved 2026-08-17, tier: manufacturer)
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