# SMF12M1FR020T

**SART Nanjing Sart Tech** · Current Sense Resistors / Shunt Resistors · 1206

SMF12M1FR020T from SART Nanjing Sart Tech, in a 1206. 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 terminal of the 1206 metal-foil current sensing resistor (R020 = 20 mΩ, ±1%), with a termination length A of 0.50±0.20 mm; the datasheet recommends a separate voltage-sense trace from the land for Kelvin sensing. |
| 2 | 2 | passive | Second terminal of the 1206 metal-foil current sensing resistor (R020 = 20 mΩ, ±1%), interchangeable with the first because the part is non-polarized, with a termination length A of 0.50±0.20 mm. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SART Nanjing Sart Tech |
| Package | 1206 |
| 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 |  |  | 20 |  | mΩ | nominal, catalog attribute (LCSC C845268) | catalog |
| Tolerance |  | -1 |  | 1 | % | catalog attribute (LCSC C845268) | catalog |
| Rated power |  |  |  | 1 | W | catalog attribute (LCSC C845268) | catalog |
| Temperature coefficient | TCR | -50 |  | 50 | ppm/°C | catalog description (LCSC C845268) | catalog |

## CAD (KiCad official)

- Symbol: `SMF12M1FR020T`
- Footprint: `Resistor_SMD:R_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `smf12m1fr020t-etched.step` / `smf12m1fr020t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smf12m1fr020t.step` / `smf12m1fr020t.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/8588937016754626560) (7 pp, sha256 `8ece06e9735a9059`, retrieved 2026-11-07, 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/smf12m1fr020t-datasheet.pdf)