HX61CN3902MR from HX hengjiaxing, 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	VOUT	output	Detector output. N-channel open-drain: pulls low when VIN falls below VDET (3.9V typ.), releases (high-Z) when VIN rises above Vs = 1.05 x VDET. Requires an external pull-up resistor (100k typ. in the application circuit). IOL >= 0.5 mA at VOUT = 0.2V with VDD = 2V.
3	VIN	power_in	Supply / sensed input voltage. Also acts as the monitored voltage rail; VDD = VIN per the electrical characteristics. Operating range 1.5V to 12V, absolute maximum 15V.
2	VSS	power_in	Ground / negative supply reference for the detector.

Key specifications

Parameter	Value
Manufacturer	HX hengjiaxing
Package	SOT-23-3L
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

HX61CN3902MRM
HX61CN3902MRP
HX61CN3902MRT
HX61CN3902MRL
HX61CN3902MRN

CAD (KiCad official)

Symbol: HX61CN3902MR
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: HX hengjiaxing datasheet (10 pp, sha256 00052857a28661d5, 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