CBM809MST3 from Corebai Microelectronics, in a SOT-23-3. 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	GND	power_in	Ground reference. All signals are referenced to this pin (0 V).
2	RESET	output	Active-low push-pull reset output (RESET-bar). Driven low while VCC is below the 4.38 V reset threshold and held low for a typical 240 ms after VCC rises back above VTH. VOL <= 0.4 V at ISINK = 3.2 mA; VOH >= VCC-1.5 V at ISOURCE = 800 uA.
3	VCC	power_in	Monitored supply voltage input. Operating range 1.0 V to 5.5 V (absolute max -0.3 V to +6 V). Typical supply current 17 uA (max 30 uA) for VCC < 3.6 V.

Key specifications

Parameter	Value
Manufacturer	Corebai Microelectronics
Package	SOT-23-3
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

CBM809MST3
CBM809MST3MSC3

CAD (KiCad official)

Symbol: CBM809MST3
Footprint: Package_TO_SOT_SMD:SOT-23-3
3D model: SOT-23-3 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Corebai Microelectronics datasheet (13 pp, sha256 c34b15cd24dfc9a6, 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