CH423NSR 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 3.3V to 30V, absolute max 40V, reverse-voltage rated to -40V. Typical supply current 3.5mA at VDD=5V (max 8mA).
2	OUT	output	Open-collector digital output pin. Drives low (VDSon <= 0.4V at 20mA sink) when magnetic switching threshold is crossed; otherwise floats (leakage <= 10uA). Requires external pull-up resistor (typ. 10kohm). Absolute max VOUT = 40V, IOUT = 25mA. Rise/fall time <= 1.5us with 20pF load.
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.

CH423NSR
CH423NSRNER
CH423NSRNTB

CAD (KiCad official)

Symbol: CH423NSR
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 (10 pp, sha256 9625e03b09468429, 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