# SMF08MAFR040T

**SART Nanjing Sart Tech** · Current Sense Resistors / Shunt Resistors · 0805

SMF08MAFR040T from SART Nanjing Sart Tech, in a 0805. 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 | 1 | passive | First end terminal of the two-terminal 0805 current-sense resistor (terminal A, 0.40±0.25 mm); rated 0.5 W at 70°C with 0.5 W needing 100 mm² of total solder pad trace. |
| 2 | 2 | passive | Second end terminal of the two-terminal 0805 current-sense resistor (terminal A, 0.40±0.25 mm); the 40 mΩ part (R040) has TCR ±50 ppm/°C and operates from -55°C to +170°C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SART Nanjing Sart Tech |
| Package | 0805 |
| Category | Resistors |
| Pins | 2 |

## Electrical characteristics

Limits from the LCSC catalog entry for this part (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Resistance |  |  | 40 |  | mΩ | nominal, catalog attribute (LCSC C845237) | catalog |
| Tolerance |  | -1 |  | 1 | % | catalog attribute (LCSC C845237) | catalog |
| Rated power |  |  |  | 500 | mW | catalog attribute (LCSC C845237) | catalog |
| Temperature coefficient | TCR | -50 |  | 50 | ppm/°C | catalog description (LCSC C845237) | catalog |

## CAD (KiCad official)

- Symbol: `SMF08MAFR040T`
- Footprint: `Resistor_SMD:R_0805_2012Metric`
- 3D model: 0805 (KiCad packages3D, STEP)
- 3D model files: `smf08mafr040t-etched.step` / `smf08mafr040t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smf08mafr040t.step` / `smf08mafr040t.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [SART Nanjing Sart Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590224279884095488) (7 pp, sha256 `8ece06e9735a9059`, retrieved 2026-11-05, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/smf08mafr040t-datasheet.pdf)