# MST1174KP

**MST** · LED Drivers · SOP-8

MST1174KP from MST, in a SOP-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 | NC | unconnected | No connection; the datasheet lists this pin as not connected. |
| 2 | NC | unconnected | No connection; the datasheet lists this pin as not connected. |
| 3 | VIN | power_in | External power input from the positive battery terminal; DC supply range is 9V to 18V, and VIN to VOUT must not exceed 45V (absolute maximum). |
| 4 | VIN | power_in | External power input from the positive battery terminal; DC supply range is 9V to 18V, and VIN to VOUT must not exceed 45V (absolute maximum). |
| 5 | VOUT | power_out | Flasher output that switches the bulb (connected between VOUT and GND) on and off at about 1.42Hz with 50% duty; current is limited to 12A and the peak output current is internally limited. |
| 6 | VOUT | power_out | Flasher output that switches the bulb (connected between VOUT and GND) on and off at about 1.42Hz with 50% duty; current is limited to 12A and the peak output current is internally limited. |
| 7 | CEXT | passive | Connects the external energy-storage capacitor (application note cites 47uF 25V) that powers the internal supply, which reaches about 5.3V; CEXT to VOUT must not exceed 5.3V (absolute maximum). |
| 8 | NC | unconnected | No connection; the datasheet lists this pin as not connected. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MST |
| Package | SOP-8 |
| Category | LED Drivers |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| DC Supply Voltage | VIN | 9 |  | 18 | V |  | 5 |
| Oscillating Frequency | Fosc | 1.25 | 1.42 | 1.58 | Hz |  | 5 |
| VIN to VOUT |  | -0.3 |  | 45 | V |  | 4 |
| CEXT to VOUT |  | -0.3 |  | 5.3 | V |  | 4 |
| Maximum Load Power |  |  |  | 35 | W |  | 4 |
| Operating Temperature Range |  | -40 |  | 125 | ℃ |  | 4 |
| Storage Temperature |  | -40 |  | 150 | ℃ |  | 4 |
| Thermal Resistance (Junction to Ambient) SOP8 |  |  |  | 130 | ℃/W |  | 4 |
| Power Dissipation SOP8 |  |  |  | 700 | mW |  | 4 |
| Electrostatic Discharge Rating - Human Body Model (HBM) |  |  |  | 2 | kV |  | 4 |
| Electrostatic Discharge Rating - Charged Device Model (CDM) |  |  |  | 200 | V |  | 4 |

## CAD (KiCad official)

- Symbol: `MST1174KP`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `mst1174kp-etched.step` / `mst1174kp-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mst1174kp.step` / `mst1174kp.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MST datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603385074465591296) (12 pp, sha256 `c25a28a146c35f7b`, retrieved 2026-10-18, 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/mst1174kp-datasheet.pdf)