TP4054-42-SOT25R from TOPPOWER Nanjing Extension Microelectronics, 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	Open-drain charge status output. Pulled low by an internal N-channel MOSFET during charging (strong pull-down, ~10 mA). When charging terminates, a weak ~20 uA current source pulls the pin up to indicate an 'AC present' standby state. Goes to high-impedance when the TP4054 detects an under-voltage lockout condition.
2	GND	power_in	Device ground reference.
3	BAT	power_out	Charge current output to the battery. Supplies programmable charge current (up to 800 mA) and regulates the final float voltage to 4.2 V via an internal precision resistor divider. In shutdown mode the internal divider is disconnected so the pin does not drain the battery.
4	VCC	power_in	Positive input supply voltage powering the charger. Operating range 4.0 V to 9.0 V (typ 5 V). Should be bypassed to GND with at least a 1 uF capacitor. UVLO threshold ~3.6 V.
5	PROG	bidirectional	Charge-current program, monitor and shutdown pin. A 1% resistor R_PROG from PROG to GND sets the charge current (I_BAT = 1000/R_PROG for I_BAT <= 150 mA; extended formula for higher currents). In constant-current mode the pin is regulated to ~1.0 V and mirrors 1/1000 of the charge current for monitoring. Leaving PROG floating (internal 2.5 uA pull-up drives pin above ~2.7 V) puts the chip in shutdown, reducing supply current to ~45 uA.

Key specifications

Parameter	Value
Manufacturer	TOPPOWER Nanjing Extension Microelectronics
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

TP4054-42-SOT25-R

CAD (KiCad official)

Symbol: TP4054-42-SOT25R
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tp4054-42-sot25r.step`	85 KB	You want the bare part, or you mark your own boards.
`tp4054-42-sot25r-etched.step`	2.6 MB	You want the part with `TP4054-42-SOT25R` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 642 faces against 102 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: TOPPOWER Nanjing Extension Microelectronics datasheet (14 pp, sha256 89bb8e97428a70bc, 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