# LM4040D30IDBZR

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

LM4040D30IDBZR from Texas Instruments, in a SOT-23. 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 | CATHODE | passive | Shunt current/voltage input (cathode of the reference). Regulates to 3.0 V above the anode when biased through a series resistor RS. Recommended cathode current 45 µA to 15 mA. |
| 2 | ANODE | passive | Common pin, normally connected to ground. Return path for the shunt current. |
| 3 | SUB | passive | Substrate connection. Pin 3 is attached to substrate and must be connected to ANODE or left open. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `LM4040D30IDBZR`
- `LM4040D30IDBZT`
- `LM4040D30IDBZRIDCKR`
- `LM4040D30IDBZRIDCKT`

## CAD (KiCad official)

- Symbol: `LM4040D30IDBZR`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `lm4040d30idbzr-etched.step` / `lm4040d30idbzr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4040d30idbzr.step` / `lm4040d30idbzr.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/lit/ds/symlink/lm4040d30idbzr.pdf) (60 pp, sha256 `9969399d53c90478`, retrieved 2026-08-17, tier: manufacturer)
- **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/lm4040d30idbzr-datasheet.pdf)