NCP1399APDR2G from onsemi, in a SOIC-16-EP. 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	HV	power_in	High-voltage startup current source input. Connects to the rectified AC line or bulk capacitor (up to 600 V) to implement the internal startup current source and Dynamic Self-Supply (DSS).
3	VBULK/PFCFB	input	Bulk voltage monitoring input. Receives a resistor-divided bulk-voltage sample to implement Brown-Out protection (0 to 5.5 V absolute max).
4	SKIP/REM	input	Skip threshold adjust / Off-mode (remote) control input. A resistor to GND sets the skip-in threshold (NCP1399Ay). Pulled up by external auxiliary source to activate off-mode/standby; pull-down by optocoupler deactivates off-mode (NCP1399By).
5	LLCFB	input	LLC feedback input. Defines operating frequency based on load; controls skip-mode entry under light load and, for NCP1399Ay, activates off-mode operation.
6	LLCCS	input	LLC current-sense input. Senses divided resonant-capacitor voltage to perform on-time modulation, out-of-resonance switching protection, over-current protection, and secondary-side short-circuit protection (-5 to +5 V abs max).
7	OTP/OVP	input	Combined over-temperature and over-voltage protection input. A single pin implements both OTP and OVP latch triggers (0 to 5.5 V abs max).
8	PON/OFF	input	PFC turn-off feedback-level adjust. Sets the FB threshold below which the external PFC stage is disabled, enabling load-dependent PFC on/off control.
9	PFCMODE	output	PFC mode / external HV switch control output. Provides supply voltage to the PFC front-stage controller and/or enables the VBULK sensing network HV switch.
10	VCC	power_in	Controller supply input. Accepts up to 20 V; VCC_ON ~15.8 V (or ~12 V on AL/AM/AR/AS variants), VCC_OFF ~9.5 V UVLO. Operating current 5.4 mA typ at 100 kHz.
11	GND	power_in	Analog ground. Common return for adjustment components, sensing networks, and low-side driver output.
12	MLOWER	output	Low-side gate driver output. Drives the lower MOSFET of the half-bridge; output swings 0 to VCC (up to ~20 V).
14	MUPPER	output	High-side (floating) gate driver output. Drives the upper MOSFET of the half-bridge, referenced to HB with supply from VBOOT.
15	HB	power_in	Half-bridge connection / high-side driver return. Connects to the switching node between the two half-bridge MOSFETs; withstands up to ~600 V and dV/dt up to 50 V/ns.
16	VBOOT	power_in	Bootstrap supply pin. Provides the floating VCC for the high-side driver referenced to HB (VBOOT_ON ~9 V, VBOOT_OFF ~8.2 V, up to 620 V absolute).

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	SOIC-16-EP
Category	PMIC
Pins	14

Ordering variants

Same part, different packaging or reel option.

NCP1399APDR2GAADR2G
NCP1399APDR2GBADR2G
NCP1399APDR2GACDR2G
NCP1399APDR2GAFDR2G
NCP1399APDR2GAGDR2G
NCP1399APDR2GAHDR2G
NCP1399APDR2GAIDR2G
NCP1399APDR2GAJDR2G
NCP1399APDR2GAKDR2G
NCP1399APDR2GALDR2G
NCP1399APDR2GAMDR2G
NCP1399APDR2GANDR2G
NCP1399APDR2G
NCP1399APDR2GARDR2G
NCP1399APDR2GASDR2G

CAD (KiCad official)

Symbol: NCP1399APDR2G
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16-EP (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ncp1399apdr2g.step`	217 KB	You want the bare part, or you mark your own boards.
`ncp1399apdr2g-etched.step`	3.1 MB	You want the part with `NCP1399APDR2G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 763 faces against 267 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 (45 pp, sha256 a9c71c608fac5987, 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