ST1S10PHR from STMicroelectronics, in a SOIC-8-EP. 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	VIN_A	power_in	Analog input supply voltage. Tie to the VIN supply source. Absolute maximum -0.3 to 20 V.
2	INH	input	Inhibit pin, active low. Connect to VIN_A if not used to enable the regulator. Absolute maximum -0.3 V to VIN_A.
3	VFB	input	Feedback voltage input for external resistor divider used to program VOUT from 0.8 V up to 0.85*VIN_SW. Absolute maximum -0.3 to 2.5 V, FB current -1 to +1 mA.
4	AGND	power_in	Analog ground return for the control circuitry. Connect to the ground plane, kept separate from PGND at the reference point.
5	SYNC	input	Synchronization and frequency select. Tie to GND for 900 kHz free-running operation, or drive with an external clock from 400 kHz to 1.2 MHz. Absolute maximum -0.3 to 6 V.
6	VIN_SW	power_in	Power input supply voltage for the internal switching power stage. Tie to the VIN power supply source, decoupled with a 4.7 µF capacitor. Absolute maximum -0.3 to 20 V.
7	SW	output	Switching node output for the external inductor of the step-down converter. Absolute maximum -0.3 to 20 V, up to 3 A output current capability.
8	PGND	power_in	Power ground return for the internal low-side switch. Connect to the ground plane close to the input capacitor.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SOIC-8-EP
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

ST1S10PHR
ST1S10PHRPUR

CAD (KiCad official)

Symbol: ST1S10PHR
Footprint: Package_SO:TI_SO-PowerPAD-8
3D model: SOIC-8-EP (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`st1s10phr.step`	123 KB	You want the bare part, or you mark your own boards.
`st1s10phr-etched.step`	1.9 MB	You want the part with `ST1S10PHR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 486 faces against 147 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 (26 pp, sha256 6d16dc400027720c, 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