STMPS2151STR from STMicroelectronics, 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	OUT	power_out	Switched power output from the internal 90 mΩ high-side N-channel MOSFET. Delivers up to 500 mA continuous when enabled; current-limited during overcurrent/short-circuit events. Bypass with output capacitor near load.
2	GND	power_in	Device ground reference.
3	FAULT	output	Open-drain, active-low fault indicator. Asserts low during overcurrent, thermal shutdown, or reverse-voltage conditions after the fault-blanking interval. Requires an external pull-up resistor to the logic supply.
4	EN	input	Enable input for the power switch. Active high on STMPS2151 (CMOS/TTL compatible); drive high to turn the output MOSFET on, drive low to disable and enter low-current standby (≤12 µA).
5	IN	power_in	2.7 V to 5.5 V supply input to the high-side MOSFET drain and internal control circuitry. Bypass with a ceramic capacitor close to the pin.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

STMPS2151STR
STMPS2151STRMTR
STMPS2151STRTTR

CAD (KiCad official)

Symbol: STMPS2151STR
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
`stmps2151str.step`	85 KB	You want the bare part, or you mark your own boards.
`stmps2151str-etched.step`	2.2 MB	You want the part with `STMPS2151STR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 536 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: STMicroelectronics datasheet (37 pp, sha256 700138497f100d55, 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