# MX26631S

**Wuxi Maxinmicro** · Surge Protection Devices (SPDs) · SOP-8

MX26631S from Wuxi Maxinmicro, in a SOP-8. 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 | Power input from 4.5V to 40V recommended operating range or -0.3V to 60V absolute maximum. |
| 2 | IN | power_in | Power input from 4.5V to 40V recommended operating range or -0.3V to 60V absolute maximum. |
| 3 | GND | power_in | System ground pin. |
| 4 | UVLO | input | Undervoltage lockout threshold input; connect to GND for 15V default threshold or use resistor divider for 1.18V to 1.28V (rising) adjustable threshold. |
| 5 | SHDN | input | Shutdown control input; below 0.8V (typical) enters shutdown mode, above 1.44V resumes operation and resets fast-latched faults. |
| 6 | ILIM | input | Current limit setting resistor connection; connect 5kΩ to 100kΩ resistor to GND to set overload and short circuit current limit from 0.6A to 3A. |
| 7 | OUT | power_out | Power output supporting up to 3A continuous current with 20mΩ to 50mΩ ON resistance. |
| 8 | OUT | power_out | Power output supporting up to 3A continuous current with 20mΩ to 50mΩ ON resistance. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Wuxi Maxinmicro |
| Package | SOP-8 |
| Category | Circuit Protection |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `MX26631S`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `mx26631s-etched.step` / `mx26631s-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mx26631s.step` / `mx26631s.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Wuxi Maxinmicro datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8604441013470064640) (12 pp, sha256 `07146f4904aa3510`, retrieved 2026-09-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/mx26631s-datasheet.pdf)