# LM4140BCMX-2.5

**Texas Instruments** · Voltage Reference · SOIC-8

LM4140BCMX-2.5 from Texas Instruments, in a SOIC-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 | GND | power_in | Negative supply or ground connection that must be connected to ground. |
| 2 | VIN | power_in | Positive supply input; the datasheet's Features list low-voltage operation from 1.8 V. |
| 3 | Enable | input | Pulled to input for normal operation; forcing this pin to ground turns off the output. |
| 4 | GND | power_in | Negative supply or ground connection that must be connected to ground. |
| 5 | NC | unconnected | This pin must be left open. |
| 6 | VREF | power_in | Reference output capable of sourcing up to 8 mA. |
| 7 | GND | power_in | Negative supply or ground connection that must be connected to ground. |
| 8 | GND | power_in | Negative supply or ground connection that must be connected to ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM4140BCMX-2.5`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `lm4140bcmx-2-5-etched.step` / `lm4140bcmx-2-5-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4140bcmx-2-5.step` / `lm4140bcmx-2-5.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm4140) (33 pp, sha256 `18565fb048b1515d`, retrieved 2026-10-12, 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/lm4140bcmx-2-5-datasheet.pdf)