# STMPS2161MTR

**STMicroelectronics** · Power Distribution Switches · SO-8

STMPS2161MTR from STMicroelectronics, in a SO-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground reference pin for the power switch. |
| 2 | IN | power_in | Input supply pin, specified for a 2.7 to 5.5 V input range. |
| 3 | IN | power_in | Second input supply pin on the SO-8 package, specified for the same 2.7 to 5.5 V input range as pin 2. |
| 4 | EN | input | Enable input for the power switch; it is active low for the STMPS2161 per Table 1 and is CMOS and TTL compatible. |
| 5 | FAULT | output | Open-drain FAULT indicator that goes active low on overcurrent after the 10 ms fault blanking time, and immediately on overtemperature (above 135 °C junction) or undervoltage. |
| 6 | OUT | power_out | Output of the 90 mΩ high-side power switch, rated for 1000 mA continuous output current on the STMPS2161. |
| 7 | OUT | power_out | Output of the 90 mΩ high-side power switch, rated for 1000 mA continuous output current on the STMPS2161. |
| 8 | OUT | power_out | Output of the 90 mΩ high-side power switch, rated for 1000 mA continuous output current on the STMPS2161. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SO-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `STMPS2161MTR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `stmps2161mtr-etched.step` / `stmps2161mtr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stmps2161mtr.step` / `stmps2161mtr.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586199658897424384) (37 pp, sha256 `700138497f100d55`, retrieved 2026-10-08, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/stmps2161mtr-datasheet.pdf)