SE100-HF from Seaward Elec, in a SOP-8-150mil. 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	GND	power_in	Device ground reference. Common return for the internal shunt regulator, bandgap reference, and D+/D- circuitry.
2	V1	output	Open-drain output (switch N1) of the output-voltage adjustment logic. Pulled low when 9 V, 12 V, or 20 V output is requested. RDS(on) typ 300 Ω; drives an external feedback resistor to adjust the adapter's output. Absolute max V1 <= VBP; I(V1) <= 0.5 mA.
3	V2	output	Open-drain output (switch N2) of the output-voltage adjustment logic. Pulled low when 12 V or 20 V output is requested. RDS(on) typ 300 Ω. Absolute max V2 <= VBP; I(V2) <= 0.5 mA.
4	V3	output	Open-drain output (switch N3) of the output-voltage adjustment logic. Pulled low when 20 V output is requested. Tie V3 to BP (directly or through <=100 kΩ) to inhibit Class-B 20 V operation. RDS(on) typ 300 Ω.
5	D-	bidirectional	USB D- data line. Monitored during Quick Charge 2.0 handshake and driven low through an internal 19.53 kΩ pull-down (switch N4) plus short-circuited to D+ via N5 during BC1.2 DCP handshake. Absolute max 5 V; I <= 1 mA.
6	D+	bidirectional	USB D+ data line. Monitored to detect QC2.0-capable powered devices (VDAT(REF) typ 0.325 V, VSEL(REF) typ 2 V) and receive output-voltage selection commands. Short-circuited to D- via switch N5 in default 5 V mode for BC1.2 DCP handshake. Absolute max 5 V; I <= 1 mA.
7	R	passive	Reference-current programming pin connected to the internal bandgap (VR typ 1.27 V). Connect an external resistor RREF (recommended 127 kΩ) to GND to set the reference current for internal timing circuits.
8	BP	power_in	Bypass / internal-supply pin. An internal shunt regulator clamps BP at ~6 V (typ 5.3 V shunt at 3 mA); power the device through an external series resistor (recommended RBP = 4.7 kΩ) from the adapter output and decouple with CBP = 220 nF to GND. Absolute max 5.6 V; IBP max 15 mA. Power-up reset at VBP < 3.9 V; correct operation requires VBP >= 4 V.

Key specifications

Parameter	Value
Manufacturer	Seaward Elec
Package	SOP-8-150mil
Category	PMIC
Pins	8

CAD (KiCad official)

Symbol: SE100-HF
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8-150mil (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`se100-hf.step`	122 KB	You want the bare part, or you mark your own boards.
`se100-hf-etched.step`	1.6 MB	You want the part with `SE100-HF` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 413 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: Seaward Elec datasheet (9 pp, sha256 917f1584d4636b82, 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