ME4057ASPG from MICRONE, in a SOIC-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	Battery temperature sense input. Connect to the wiper of a divider formed with the pack NTC thermistor. Charging is suspended when V_TEMP falls below ~45% V_CC or rises above ~80% V_CC. Tie to GND to disable the temperature-sense function.
2	PROG	bidirectional	Charge-current program and monitor pin. A resistor R_PROG from PROG to GND sets the fast-charge current per I_BAT = (V_PROG/R_PROG)*1100 (V_PROG ≈ 1 V in constant-current mode, 0.1 V in precharge). The pin voltage may also be measured to monitor instantaneous charge current.
3	GND	power_in	Device ground return. Connect to the system ground plane; the ESOP exposed pad should also be soldered to this ground for thermal dissipation.
4	VCC	power_in	Positive input supply (4.7 V - 6.5 V typical, 5 V nominal) from a USB port or wall adapter. When VCC drops within ~80 mV of V_BAT the device enters low-power sleep, dropping I_BAT to <2 µA. Bypass locally with a ceramic capacitor.
5	BAT	power_out	Battery connection pin. Sources the regulated charge current from the internal PMOS power FET (R_ON ≈ 650 mΩ) up to 1 A, and regulates to 4.2 V float voltage on the 'A' variant. Drain from the battery is <2 µA in disable/sleep modes.
6	STDBY	output	Open-drain charge-terminated status output (active-low, overlined /STDBY). Pulled low when charging has terminated (battery full); otherwise high impedance. Typically drives a green LED to VCC through a current-limit resistor.
7	CHRG	output	Open-drain charge-in-progress status output (active-low, overlined /CHRG). Pulled low while the battery is charging; goes to high impedance when charging terminates or the battery is out of temperature range. Typically drives a red LED to VCC.
8	CE	input	Chip-enable input, TTL/CMOS compatible. Drive high (or leave floating pulled up) to place the device in normal operating mode; drive low to force the ME4057 into disable (shutdown) mode.

Key specifications

Parameter	Value
Manufacturer	MICRONE
Package	SOIC-8-EP
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

ME4057ASPG
ME4057ASPG-A5
ME4057ASPGBSPG
ME4057ASPGDSPG
ME4057ASPGESPG

CAD (KiCad official)

Symbol: ME4057ASPG
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm
3D model: SOIC-8-EP (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`me4057aspg.step`	125 KB	You want the bare part, or you mark your own boards.
`me4057aspg-etched.step`	2.0 MB	You want the part with `ME4057ASPG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 511 faces against 152 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: MICRONE datasheet (21 pp, sha256 58a52d07736328ec, 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