NCP1370BDR2G 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	ILIM	input	Peak current limit and secondary-diode short detection threshold. A resistor to GND on this pin sets the cycle-by-cycle peak current limit (VILIMIT) and the VCS(stop) threshold used to detect an output/secondary-diode short circuit.
2	ZCD	input	Zero-Crossing Detection input. Connects (via a divider) to the transformer auxiliary winding to detect the core-reset (demagnetization) event for quasi-resonant valley switching. Feeds the valley-selection state machine and the propagation delay tZCD(DEM).
3	CS	input	Current-sense input. Monitors the primary MOSFET peak current developed across an external sense resistor. Used for cycle-by-cycle peak-current control, leading-edge blanking, feed-forward compensation, and the CS-pin short-circuit / secondary diode-short protections.
4	GND	power_in	Controller ground reference. All internal thresholds and the CS/ZCD/ILIM/VIN sense signals are referenced to this pin.
5	DRV	output	Totem-pole gate-driver output for the external primary-side MOSFET. Sources 300 mA / sinks 500 mA and is internally clamped to VDRV(high) (~12 V typ). Maximum voltage range −0.3 V to VDRV; current range −500 mA / +800 mA.
6	VCC	power_in	Controller supply voltage. Operates over a wide VCC range with VCC(on) ≈ 12 V startup threshold, VCC(off) ≈ 9 V UVLO, and absolute maximum +35 V; a low VCC(on) allows powering from a standby auxiliary supply. Includes VCC over-voltage protection (auto-recovery on the 'B' variant).
7	VIN	input	HV-rail sense input: performs brown-out protection, line voltage sensing for valley selection and line feed-forward, and adjustable OVP. Typically fed from a resistor divider off the bulk/HV rail; a Zener to this pin can be used to trigger the adjustable OVP shutdown (OVP2). Absolute max −0.3 V to +5.5 V.
8	DIM	input	Analog or PWM dimming control input, also used to enter OFF mode. An analog voltage between VDIM(EN) and VDIM100 sets the LED current; alternatively a PWM signal with amplitude greater than VDIM100 performs digital dimming. Absolute max −0.3 V to +7 V.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	SOIC-8
Category	LED Drivers
Pins	8

Ordering variants

Same part, different packaging or reel option.

NCP1370BDR2G

CAD (KiCad official)

Symbol: NCP1370BDR2G
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 (19 pp, sha256 ee6c8a742961a1f8, 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