# LM4040CELT-3.0

**STMicroelectronics** · Voltage Reference · SOT-23-3L

LM4040CELT-3.0 from STMicroelectronics, in a SOT-23-3L. 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 | K | passive | Cathode of the shunt reference, where the 3.0 V reverse breakdown voltage is set with Ik of 12 µA minimum and 15 mA maximum operating current. |
| 2 | A | passive | Anode of the shunt reference, the common return terminal. |
| 3 | NC | unconnected | No connect pin that must be left unconnected or connected to the anode. |

## Key specifications

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

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reverse breakdown voltage (Vk = 3.0 V), LM4040C | Vk | 2.985 | 3 | 3.015 | V | Ik = 12 µA, LM4040C | 4 |
| Precision at 25 °C (LM4040C, 0.5%) |  | -0.5 |  | 0.5 | % | Tamb = 25 °C | 1 |
| Average temperature coefficient | ΔVk/ΔT |  | 20 | 70 | ppm/°C | 10 µA < Ik < 20 mA | 4 |
| Reverse breakdown voltage change with operating current range | ΔVk/ΔIk |  | 0.2 | 1 | mV | Ik min < Ik < 1 mA, -40°C < Tamb < +125°C | 4 |
| Reverse breakdown voltage change with operating current range | ΔVk/ΔIk |  | 1.7 | 4 | mV | 1 mA < Ik < 15 mA, -40°C < Tamb < +125°C | 4 |
| Static impedance | Rka |  | 0.15 | 0.3 | Ω | ΔIk = 10 µA to 10 mA | 4 |
| Reverse breakdown current | Ik |  |  | 20 | mA |  | 3 |
| Forward current | If |  |  | 15 | mA |  | 3 |
| Power dissipation | Pd |  |  | 500 | mW | Tamb = 25 °C, Tjmax = 150 °C (footnote 1) | 3 |
| Storage temperature | Tstd | -65 |  | 150 | °C |  | 3 |
| ESD Human Body Model (HBM) |  |  |  | 2 | kV |  | 3 |
| ESD Machine Model (MM) |  |  |  | 200 | V |  | 3 |
| ESD Charged device model |  |  |  | 1500 | V |  | 3 |
| Lead temperature (soldering) | Tlead |  |  | 260 | °C | 10 sec. | 3 |
| Max. junction temperature | Tj |  |  | 150 | °C |  | 3 |
| Minimum operating current | Ikmin | 10 |  |  | µA |  | 3 |
| Maximum operating current | Ikmax |  |  | 15 | mA |  | 3 |
| Operating free air temperature range | Toper | -40 |  | 125 | °C |  | 3 |
| Thermal resistance junction ambient | RthJA |  | 210 |  | °C/W | SOT23-3L | 3 |
| Thermal resistance junction-case | RthJC |  | 103 |  | °C/W | SOT23-3L | 3 |

## CAD (KiCad official)

- Symbol: `LM4040CELT-3.0`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `lm4040celt-3-0-etched.step` / `lm4040celt-3-0-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4040celt-3-0.step` / `lm4040celt-3-0.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590459170316460032) (23 pp, sha256 `f92699ed8c875e79`, retrieved 2026-10-11, 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/lm4040celt-3-0-datasheet.pdf)