CH442PSR 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 pin. Operating range 2.5 V to 22 V; absolute maximum 24 V; supply current typ. 1.6 mA at VDD=3.3 V; internal Zener clamp at 24 V.
2	OUT	output	Open-drain digital output with internal 10 kohm pull-up resistor. Sinks up to 25 mA (short-circuit limited 30-90 mA), VDSon <= 0.4 V at 20 mA, output voltage rating up to 24 V; toggles with south/north magnetic pole per latch characteristic.
3	GND	power_in	Device 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.

CH442PSR
CH442PSRPTB
CH442PSRPER

CAD (KiCad official)

Symbol: CH442PSR
Footprint: Package_TO_SOT_SMD:SOT-23-3
3D model: SOT-23-3L (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: COSEMITECH datasheet (15 pp, sha256 fe0b8d7fc332f97d, 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