# TMI3108

**TMI** · DC-DC Converters · SOT-23-5

TMI3108 from TMI, in a SOT-23-5. 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 | EN | input | Chip enable pin: drive EN above 1.5V to turn the part on and below 0.3V to turn it off, and do not leave it floating. |
| 2 | GND | power_in | Ground pin for the device. |
| 3 | LX | output | Power switch output and switch node connection to the inductor. |
| 4 | VIN | power_in | Power supply input (2.5V to 5.5V recommended range) that must be closely decoupled to GND with a 4.7µF or greater ceramic capacitor. |
| 5 | FB | input | Output voltage feedback pin used to set the regulated output voltage through the external resistor divider. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TMI |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |

## CAD (KiCad official)

- Symbol: `TMI3108`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `tmi3108-etched.step` / `tmi3108-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tmi3108.step` / `tmi3108.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/8588904526551633920) (13 pp, sha256 `1116876ea49af9e7`, 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/tmi3108-datasheet.pdf)