HT4084ARTZ from HTCSEMI, in a SOT-23-5. 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	CHRG	output	Charge indicator pin, open-drain. Connect to the cathode of an LED (anode to VCC via ~1K resistor). Pin is pulled low during charging to light the LED (5mA drive typical); high-Z when charging completes.
2	GND	power_in	Device ground reference.
3	BAT	power_out	Battery charge current output. Connect to Li-ion battery positive terminal. Requires at least 10uF ceramic bypass capacitor to GND. Regulated float voltage 4.2V (typ), 4.15-4.25V.
4	VCC	power_in	Supply input from USB / AC adapter. Recommended operating range 4-6V (typ 5V); UVLO ~4.0V rising / 3.9V falling; input OVP at 6.25V; absolute max 24V (survives 28V surge). Bypass with >=10uF ceramic close to VCC/GND.
5	PROG	passive	Constant-current programming and charge-current monitor pin. Connect a 1% resistor RPROG to GND to set ICC per IBAT = (VPROG / RPROG) x 1000. Voltage on this pin is 0.05V in SC mode, 0.1V in TC mode, and 1V in CC mode. Example: RPROG = 2K sets ~500mA; 10K sets ~100mA.

Key specifications

Parameter	Value
Manufacturer	HTCSEMI
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

HT4084ARTZ
HT4084ARTZBRTZ

CAD (KiCad official)

Symbol: HT4084ARTZ
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HTCSEMI datasheet (11 pp, sha256 28e90be167683757, 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