# RLM12FTCMR039

**TA I Tech** · Current Sense Resistors / Shunt Resistors · 1206

RLM12FTCMR039 from TA I 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 | Terminal 1 | passive | One Ni/Sn-plated metal alloy terminal of the RLM12 1206 (3.2 x 1.6 mm) current sensing resistor, rated 1/4W, 1/2W or 1W by the power-rating code, with 0.6 ±0.20 mm thick terminal for 2mΩ to 50mΩ parts. |
| 2 | Terminal 2 | passive | The other Ni/Sn-plated metal alloy terminal of the RLM12 current sensing resistor, interchangeable with terminal 1 (non-polarised), with operating temperature -55℃ to +170℃. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TA I 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 |  |  | 39 |  | mΩ | nominal, catalog attribute (LCSC C912765) | catalog |
| Tolerance |  | -1 |  | 1 | % | catalog attribute (LCSC C912765) | catalog |
| Rated power |  |  |  | 1 | W | catalog attribute (LCSC C912765) | catalog |

## CAD (KiCad official)

- Symbol: `RLM12FTCMR039`
- Footprint: `Resistor_SMD:R_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `rlm12ftcmr039-etched.step` / `rlm12ftcmr039-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rlm12ftcmr039.step` / `rlm12ftcmr039.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TA I Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8758000771541405696) (6 pp, sha256 `6f3e3568fbc984ef`, retrieved 2026-10-31, 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/rlm12ftcmr039-datasheet.pdf)