STMPS2141STR 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 high-side power output. Delivers up to 500 mA continuous from IN through the internal 90 mΩ N-channel MOSFET. Current-limited to a safe level under overload or short-circuit and shut off on thermal trip.
2	GND	power_in	Device ground reference for the control logic and internal references.
3	FAULT	output	Open-drain fault indicator, active low. Asserts on overcurrent, short-circuit, thermal shutdown, or reverse-voltage conditions after the internal fault-blanking delay. Requires an external pull-up resistor.
4	EN	input	Enable input for the power switch. CMOS/TTL compatible. On the STMPS2141 the enable is ACTIVE LOW: drive low to turn the switch ON, drive high to turn it OFF.
5	IN	power_in	Input supply and drain of the internal high-side MOSFET. Operating range 2.7 V to 5.5 V. Bypass with a local ceramic capacitor to GND.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

STMPS2141STR
STMPS2141STRMTR
STMPS2141STRTTR

CAD (KiCad official)

Symbol: STMPS2141STR
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
`stmps2141str.step`	85 KB	You want the bare part, or you mark your own boards.
`stmps2141str-etched.step`	2.1 MB	You want the part with `STMPS2141STR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 521 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