HG809LM3 from HGSEMI, in a SOT-23. 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	Chip ground reference. Connect to the system ground plane.
2	RESET	output	Active-low reset output (RESET with overbar). Asserts low (VOL <= 0.3 V at ISINK=1.2 mA) when VCC drops below the reset threshold Vth (nominally 4.63 V for HG809LM3) and stays low for the ~200 ms typical power-up reset delay (Trp = 80-350 ms) after VCC returns above threshold. Drives high (VOH >= 0.8*VCC at ISOURCE=500 uA) during normal operation.
3	VCC	power_in	Chip supply input. Operating range 1.0 V to 6.0 V (absolute max 6.5 V); the monitored supply whose voltage is compared against the internal reset threshold Vth.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	SOT-23
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

HG809LM3/TR

CAD (KiCad official)

Symbol: HG809LM3
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HGSEMI datasheet (6 pp, sha256 4dd29334cac9e274, 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