HX6639IUA-A from HUAXIN, in a TO-92S. 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	Power supply input. Operating range 2.8 V to 6.0 V (absolute max 8 V); typical supply current 3.3 mA at 5 V. Bypass with a 1 nF/10 V decoupling capacitor to GND per the application diagram.
2	GND	power_in	Ground reference. Must be tied solidly to the supply ground return.
3	OUTPUT	output	Push-pull analog output; no pull-up required. Quiescent output equals VDD/2 at 0 Gs (VNULL ≈ 2.5 V at 5 V). A south-pole field raises Vout above VDD/2 (up to ~4.9 V at max range), a north-pole field lowers it (down to ~0.01 V); sensitivity 4.0 mV/Gs over ±600 Gs. Drive capability 1.5 mA typical; absolute-max output current 20 mA. A 10 nF/10 V output filter capacitor to GND is recommended.

Key specifications

Parameter	Value
Manufacturer	HUAXIN
Package	TO-92S
Category	Sensor
Pins	3

Ordering variants

Same part, different packaging or reel option.

HX6639IUA-A
HX6639IUA-B
HX6639IUA-C
HX6639IUA-D
HX6639IUA-AISO-A
HX6639IUA-AISO-B
HX6639IUA-AISO-C
HX6639IUA-AISO-D

CAD (KiCad official)

Symbol: HX6639IUA-A
Footprint: Package_TO_SOT_THT:TO-92_Inline
3D model: TO-92S (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`hx6639iua-a.step`	27 KB	You want the bare part, or you mark your own boards.
`hx6639iua-a-etched.step`	1.7 MB	You want the part with `HX6639IUA-A` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 433 faces against 19 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