CN3158 from ShangHai Consonance Elec, in a ESOP-8. 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 output of an NTC thermistor on the battery pack. Charging is paused when V(TEMP) < 45% or > 80% of V(VIN), indicating battery over/under-temperature; charging resumes when V(TEMP) is between 45% and 80% of V(VIN). Tie to GND to disable temperature monitoring.
2	ISET	passive	Constant-current charge current programming and charge-current monitor. Connect a resistor R_ISET from ISET to GND to set the charge current: I_CH = (V_ISET x 986) / R_ISET. V(ISET) = 1.205V in constant-current mode and 0.12V in trickle-charge mode.
3	GND	power_in	Device ground / power return.
4	VIN	power_in	Positive input supply, 4.4V to 6V. Powers the internal circuits and the pass transistor. When V(VIN) - V(BAT) < 10mV the chip enters low-power sleep mode and BAT current drops below 3uA.
5	BAT	power_out	Battery connection. Connect the battery positive terminal here. Supplies charge current and constant-voltage regulation (3.63V nominal). In UVLO or sleep mode BAT sink current is < 3uA.
6	DONE	output	Open-drain charge-end status output. Pulled low internally when charging has terminated; high-impedance otherwise. Sink capability 10mA (V_DONE=0.3V); off-state leakage <1uA at 6V.
7	CHRG	output	Open-drain charge-in-progress status output. Pulled low internally while charging is active; high-impedance otherwise. Sink capability 10mA (V_CHRG=0.3V); off-state leakage <1uA at 6V. Typically drives a red status LED.
8	FB	input	Battery voltage feedback / sense input. Precisely regulates the battery-side constant-voltage charge point, bypassing wire and contact resistance between the battery + terminal and BAT pin. Add a resistor Rx from FB to BAT to raise V_REG per V_REG = 3.63 + 3.707e-6 x Rx (V, ohms). Input bias current typ 3uA.

Key specifications

Parameter	Value
Manufacturer	ShangHai Consonance Elec
Package	ESOP-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

CN3158

CAD (KiCad official)

Symbol: CN3158
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm
3D model: ESOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`cn3158.step`	193 KB	You want the bare part, or you mark your own boards.
`cn3158-etched.step`	1.3 MB	You want the part with `CN3158` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 327 faces against 63 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: ShangHai Consonance Elec datasheet (13 pp, sha256 36aa8aedab632b81, 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