# REF5040AID

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

REF5040AID 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 | DNC | unconnected | Do not connect |
| 2 | VIN | power_in | Input supply voltage, minimum VOUT + 0.2V, maximum 18V |
| 3 | TEMP | output | Temperature monitoring pin providing temperature-dependent output voltage with approximately 60kΩ source impedance |
| 4 | GND | power_in | Ground |
| 5 | TRIM/NR | passive | Output adjustment or noise reduction pin for fine-tuning output voltage or reducing output noise |
| 6 | VOUT | output | Reference voltage output, 4.096V nominal with ±0.1% initial accuracy |
| 7 | NC | unconnected | No internal connection |
| 8 | DNC | unconnected | Do not connect |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `REF5040AID`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ref5040aid-etched.step` / `ref5040aid-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ref5040aid.step` / `ref5040aid.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/ref50.pdf) (52 pp, sha256 `d2da9488194dba11`, retrieved 2026-10-05, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/ref5040aid-datasheet.pdf)