CH410K from WCH Jiangsu Qin Heng, in a SOT-363. 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	HV	input	Threshold voltage select (analog input). Leave floating (do NOT tie to GND) to select the 2.3 V low-voltage threshold; short to VCC to select the 3.0 V high-voltage threshold. Internal comparator is non-precision with some spread.
2	GND	power_in	Common ground / return.
3	RSTH	output	Active-HIGH power-on / low-voltage reset output, push-pull. Held high during power-up and brown-out, switches low after the Trhd delay (typ 20 ms) once VCC is above threshold. Drives 5 mA VOH ≥ VCC-0.5 V / 8 mA VOL ≤ 0.5 V.
4	RSTL	output	Active-LOW power-on / low-voltage reset output, open-drain. Pulled low during power-up and brown-out, releases to Hi-Z after the Trld delay (typ 40 ms). Typically needs an external pull-up (e.g. to VOUT) when driving an MCU active-low RESET.
5	VCC	power_in	Positive supply input, monitored rail. Operating range 1.0 V to 5.3 V (absolute max 6.0 V). External decoupling capacitor is recommended to be at least 5× the VOUT load capacitor.
6	VOUT	power_out	Switched power output, push-pull, with built-in low-voltage discharge. Turns on Tvd (typ 5 ms) after VCC crosses the threshold and discharges within ~0.02 µs of VCC dropping below threshold. Supplies up to 40 mA with a ~35-60 mV drop from VCC; supports 0.1-10 µF load cap. Also usable as an active-low reset output.

Key specifications

Parameter	Value
Manufacturer	WCH Jiangsu Qin Heng
Package	SOT-363
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

CH410K

CAD (KiCad official)

Symbol: CH410K
Footprint: Package_TO_SOT_SMD:SOT-363_SC-70-6
3D model: SOT-363 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ch410k.step`	99 KB	You want the bare part, or you mark your own boards.
`ch410k-etched.step`	1.2 MB	You want the part with `CH410K` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 310 faces against 117 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: WCH Jiangsu Qin Heng datasheet (4 pp, sha256 f072610f7f5e707b, 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