# STI3508C

**TMI** · DC-DC Converters · SOT-23-6

STI3508C from TMI, in a SOT-23-6. 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 | LX | output | Power switch output and drain of the internal MOSFET switch; connect the power inductor and output rectifier to LX, which has an absolute maximum rating of 35 V. |
| 2 | GND | power_in | Ground pin. |
| 3 | FB | input | Feedback input regulated to 0.6 V for the STI3508C (1.2 V for the STI3508CA); connect the output resistor divider to FB, with an absolute maximum range of -0.3 V to 7 V. |
| 4 | EN | input | Regulator on/off control where a high input (at least 1.5 V) turns the converter on and a low input (at most 0.3 V) turns it off; when unused, connect EN to the input supply for automatic startup, with an absolute maximum of 7 V. |
| 5 | IN | power_in | Input supply pin that must be locally bypassed; the input voltage range is 2.5 V to 5.5 V. |
| 6 | NC | unconnected | No connection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TMI |
| Package | SOT-23-6 |
| Category | Power Management (PMIC) |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `STI3508C`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `sti3508c-etched.step` / `sti3508c-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sti3508c.step` / `sti3508c.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588945768451887104) (12 pp, sha256 `5cb8eb1359a05b92`, retrieved 2026-10-09, 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/sti3508c-datasheet.pdf)