NCP1200D100R2G 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	Adj	input	Skip-cycle peak-current adjust. Sets the level below which the controller enters skip-cycle mode for light-load efficiency. Default Vskip ~1.4 V; internal output impedance ~25 kOhm.
2	FB	input	Feedback input; connect an optocoupler collector here to adjust the peak-current setpoint according to output power demand. Internally pulled up (Rup ~8 kOhm) to internal reference; FB-to-Ipk division ratio ~4.
3	CS	input	Current sense input. Senses the primary switch current via a sense resistor and routes it through a 250 ns leading-edge blanking network to the internal PWM comparator. Max internal current setpoint ~1.0 V.
4	GND	power_in	IC ground reference for all internal circuitry.
5	Drv	output	Gate drive output to an external MOSFET or IGBT. +/-250 mA peak source/sink; Roh ~40 Ohm (typ), Rol ~12 Ohm (typ). Rise ~67 ns, fall ~28 ns into 1 nF.
6	VCC	power_in	Supply pin for the IC. Connect an external bulk capacitor of typically 10 uF. UVLO: VCCON ~9.8 V (start), VCCOFF ~11.4 V (stop during dynamic self-supply). Absolute max 16 V.
7	NC	unconnected	No connection. Left un-connected to ensure adequate creepage distance between the low-voltage side (VCC) and the high-voltage HV pin.
8	HV	power_in	High-voltage start-up / self-supply pin. Connect directly to the rectified high-voltage rail; injects a constant current (~4 mA) into the VCC bulk cap to eliminate the auxiliary winding. Minimum operating voltage 30 V; max 450 V (VCC grounded) or 500 V (VCC decoupled with 10 uF).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

NCP1200D100R2G
NCP1200D100R2GP100G

CAD (KiCad official)

Symbol: NCP1200D100R2G
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: onsemi datasheet (18 pp, sha256 6af2476d5e861a8b, 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