HX811TDB4RG from HANSCHIP semiconductor, in a SOT-143. 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 / negative supply return for the supervisor.
2	VRESET	output	Active-low reset output. Pulled low when VCC < Vth (3.08 V typ for HX811T) or when MR is held low. Returns high after Trp (~500 ms typ, 85-900 ms range) once VCC recovers above Vth and MR is high. VOL <= 0.5 V at ISINK=3.2 mA; VOH >= 0.8*VCC at ISOURCE=500 uA.
3	MR	input	Active-low manual reset / enable input. Driving MR low forces VRESET low; releasing MR high (>=0.7VCC) allows VRESET to go high after the Trp delay. VIL <= 0.2*VCC, VIH >= 0.7VCC. Minimum pulse width tMR = 10 us. Pull-up current IMR up to 25 uA at VCC=6 V.
4	VCC	power_in	Positive supply input and monitored voltage. Operating range 1.0 V to 6.0 V; absolute maximum 6.5 V. Typical quiescent current 2 uA (ICCH 5 uA max at VCC=6 V, MR=VCC).

Key specifications

Parameter	Value
Manufacturer	HANSCHIP semiconductor
Package	SOT-143
Category	PMIC
Pins	4

Ordering variants

Same part, different packaging or reel option.

HX811TDB4RG

CAD (KiCad official)

Symbol: HX811TDB4RG
Footprint: Package_TO_SOT_SMD:SOT-143
3D model: SOT-143 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HANSCHIP semiconductor datasheet (6 pp, sha256 c37890825cd37e9f, 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