AP7331-25WG-7 from Diodes Incorporated, in a SOT-25. 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	IN	power_in	Voltage input pin (2V to 6V). Bypass to ground through at least a 1µF capacitor.
2	GND	power_in	Ground reference for the regulator.
3	EN	input	Enable input, active high. VIH ≥ 1.4V turns the regulator on; VIL ≤ 0.4V shuts it down. Do not float; absolute max VIN + 0.3V.
4	NC	unconnected	No internal connection. Leave floating or tie to GND.
5	OUT	power_out	Regulated 2.5V output pin, 300mA capable. Bypass to ground through a 1µF ceramic capacitor for stability.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SOT-25
Category	PMIC
Pins	5

Ordering variants

AP7331-25WG-7

CAD (KiCad official)

Symbol: AP7331-25WG-7
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-25 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ap7331-25wg-7.step`	85 KB	You want the bare part, or you mark your own boards.
`ap7331-25wg-7-etched.step`	2.1 MB	You want the part with `AP7331-25WG-7` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 516 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: Diodes Incorporated datasheet (13 pp, sha256 9fdedb2b73161d34, 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