TP4056X-42-ESOP8 from TOPPOWER Nanjing Extension Microelectronics, in a SOP-8-EP. 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	TEMP	input	Temperature sense input. Connect to the NTC thermistor output of the Li-ion battery pack. Charging is suspended when the pin voltage falls below 45% or rises above 80% of VCC. Ground the pin to disable the temperature sense function. Absolute maximum: -0.3V to 10V.
2	PROG	passive	Constant charge current programming and charge current monitor. A resistor RPROG from this pin to GND sets IBAT = (VPROG/RPROG) * 1100. Regulated to 1V in constant-current mode and 0.1V during pre-charge. Maximum PROG pin current 1200uA. Absolute maximum: -0.3V to VCC+0.3V.
3	GND	power_in	Ground terminal. Reference for all voltages; also serves as thermal path via the ESOP exposed pad on the bottom of the package.
4	VCC	power_in	Positive input supply voltage (4.0V to 8.0V typical, 5V nominal). Provides power to the charger. When VCC falls within 30mV of the BAT pin voltage, the device enters shutdown and draws less than 1uA from BAT. UVLO threshold ~3.7V. Absolute maximum: -6.5V to 8V.
5	BAT	power_out	Battery connection. Connect to the positive terminal of the single-cell Li-ion battery. Regulates final float voltage to 4.2V (TP4056X-42 variant). Delivers up to ~1200mA. BAT draws less than 1uA in chip-disable or sleep modes. Absolute maximum: -4.35V to 7V.
6	~STDBY	output	Charge status open-drain output (active low). Pulled low by an internal switch when the battery charge cycle is complete; high impedance otherwise. Requires an external pull-up (typically a green LED with series resistor to VCC). Absolute maximum: -0.3V to 10V.
7	~CHRG	output	Charge status open-drain output (active low). Pulled low by an internal switch while the battery is charging; high impedance otherwise. Requires an external pull-up (typically a red LED with series resistor to VCC). Absolute maximum: -0.3V to 10V.
8	CE	input	Chip enable input. Logic high (turn-on ~0.8V typ) puts the TP4056X into normal operation; logic low prohibits charging. TTL/CMOS compatible. Requires connection through a series resistor (RCE, typ 10K) for input terminal reverse polarity protection. Absolute maximum: -6.5V to 10V.

Key specifications

Parameter	Value
Manufacturer	TOPPOWER Nanjing Extension Microelectronics
Package	SOP-8-EP
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

TP4056X-42-ESOP8
TP4056X-435-ESOP8

CAD (KiCad official)

Symbol: TP4056X-42-ESOP8
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8-EP (KiCad packages3D, STEP)

Provenance

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

Datasheet: TOPPOWER Nanjing Extension Microelectronics datasheet (15 pp, sha256 aa6198cd5fccc5da, retrieved 2026-08-17, tier: manufacturer)
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