# MST1173TQ

**MST** · LED Drivers · TO-252

MST1173TQ from MST, in a TO-252. 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 | VIN | power_in | External power input; the datasheet gives a DC input voltage range of 9 V to 24 V for a 25 W lamp load and an absolute maximum of 24 V. |
| 2 | VOUT | output | Flasher output that drives the lamp in series between VOUT and GND, switched by the internal power MOSFET with a peak current limit of 10 A. |
| 3 | CEXT | passive | Connects an external capacitor that is charged from VIN to set the flash timing, with a stated CEXT-to-VOUT peak voltage of 5.3 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MST |
| Package | TO-252 |
| Category | Display Modules / LED Drivers / Display Drivers |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `MST1173TQ`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files: `mst1173tq-etched.step` / `mst1173tq-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mst1173tq.step` / `mst1173tq.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MST datasheet](docs/mst1173tq-datasheet.pdf) (8 pp, sha256 `41f64521ebea6cad`, retrieved 2026-10-27, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/mst1173tq-datasheet.pdf)