HX6639ISO-D from HUAXIN, in a SOT-23. 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	VDD	power_in	Supply input. Operating range 2.8 V to 6.0 V (abs max 8 V, reverse -0.5 V). Typical IDD ~3.3 mA at 5 V, B=0. Bypass with a 1 nF/10 V ceramic near the pin per the application diagram.
2	OUTPUT	output	Push-pull analog Hall output, no pull-up required. VOUT = VDD/2 at B = 0 (VNULL). Slope for the D variant is 13.0 mV/Gs (linear over ±185 Gs); VOH ~4.9 V, VOL ~0.01-0.1 V, IO up to 1.5 mA source/sink, TSW ~150 µs. South-pole field near the top drives VOUT above VNULL, north-pole drives it below. Recommended 10 nF/10 V load cap to GND.
3	GND	power_in	Device ground. Must connect solidly to the supply return.

Key specifications

Parameter	Value
Manufacturer	HUAXIN
Package	SOT-23
Category	Sensor
Pins	3

Ordering variants

Same part, different packaging or reel option.

HX6639ISO-A
HX6639ISO-B
HX6639ISO-C
HX6639ISO-D
HX6639ISO-DIUA-A
HX6639ISO-DIUA-B
HX6639ISO-DIUA-C
HX6639ISO-DIUA-D

CAD (KiCad official)

Symbol: HX6639ISO-D
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`hx6639iso-d.step`	59 KB	You want the bare part, or you mark your own boards.
`hx6639iso-d-etched.step`	2.1 MB	You want the part with `HX6639ISO-D` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 496 faces against 69 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: HUAXIN datasheet (13 pp, sha256 b848aed2dc79da33, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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