# LM4050AIM3X-2.5

**Texas Instruments** · Voltage Reference · SOT-23-3

LM4050AIM3X-2.5 from Texas Instruments, in a SOT-23-3. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | K | passive | Cathode (negative marking on top view; this is the shunt-regulator cathode that sinks the shunt current IQ and sets the regulated reverse breakdown voltage VR = 2.5V). Connect through series resistor RS to Vs; the regulated Vout is taken here. |
| 2 | A | passive | Anode (common pin, typically tied to ground). Return terminal of the shunt reference; carries IQ + IL back to the supply return. |
| 3 | NC | unconnected | No internal connection - this pin is the die-attach pad and forms a parasitic Schottky diode to pin 2 (anode). Must be left floating or tied to pin 2 (anode). TI recommends tying to anode in high-EMI or high-frequency switching-noise environments. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `LM4050AIM3X-2.5`
- `LM4050AIM3-2.5`
- `LM4050BIM3X-2.5`
- `LM4050BIM3-2.5`
- `LM4050CIM3X-2.5`
- `LM4050CIM3-2.5`
- `LM4050AEM3X-2.5`
- `LM4050AEM3-2.5`
- `LM4050BEM3X-2.5`
- `LM4050BEM3-2.5`
- `LM4050CEM3X-2.5`
- `LM4050CEM3-2.5`

## CAD (KiCad official)

- Symbol: `LM4050AIM3X-2.5`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `lm4050aim3x-2-5-etched.step` / `lm4050aim3x-2-5-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4050aim3x-2-5.step` / `lm4050aim3x-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/lm4050-n) (None pp, sha256 `a56eb11c173b31e8`, retrieved 2026-08-17, 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:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/lm4050aim3x-2-5-datasheet.pdf)