CH604ASR from COSEMITECH, in a SOT-23-3L. 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 voltage input. Operating range 3.0 V to 15 V (absolute max 18 V). Typical supply current 4 mA at 5 V. Recommend 100 nF decoupling capacitor to GND.
2	OUT	output	Ratiometric analog linear output proportional to magnetic flux density. Quiescent output = VDD/2 at B=0 (2.42-2.58 V at VDD=5 V). Sensitivity 2.5 mV/Gauss (CH604), sink capability ~1 mA, source capability ~2 mA at 5 V. Typical 4.7 nF load capacitor to GND.
3	GND	power_in	Ground reference pin.

Key specifications

Parameter	Value
Manufacturer	COSEMITECH
Package	SOT-23-3L
Category	Sensor
Pins	3

Ordering variants

Same part, different packaging or reel option.

CH604ASR
CH604ASRAER
CH604ASRATB

CAD (KiCad official)

Symbol: CH604ASR
Footprint: Package_TO_SOT_SMD:SOT-23-3
3D model: SOT-23-3L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ch604asr.step`	59 KB	You want the bare part, or you mark your own boards.
`ch604asr-etched.step`	1.6 MB	You want the part with `CH604ASR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 392 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: COSEMITECH datasheet (9 pp, sha256 09dd7920174583b6, 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