HT7039S from UMW, 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	OUT	output	Chip output. NMOS open-drain detector output; pulls low when VDD falls below VDET (3.9V typ). Requires an external pull-up resistor (Rp) to VCC. IOL = 4mA min / 6mA typ at VOUT=0.2V.
3	VDD	power_in	Chip input / supply voltage. Operating range 1.5V-12V; absolute max 15V. The voltage monitored against the internal reference (VDET = 3.9V typ for HT7039).
2	GND	power_in	Chip ground reference (0V).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

HT7039SS

CAD (KiCad official)

Symbol: HT7039S
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: UMW datasheet (12 pp, sha256 ca4a5b03cf717e3e, retrieved 2026-08-17, tier: lcsc)
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