# LR122WF220LT4E

**UNI ROYAL Uniroyal Elec** · Current Sense Resistors / Shunt Resistors · 2512

LR122WF220LT4E from UNI ROYAL Uniroyal Elec, in a 2512. 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 | One of the two end terminals of the LR12 2W metal strip chip resistor (6.35±0.254 x 3.18±0.254 mm body); the part is non-polarized and rated 2W at 70°C. |
| 2 | 2 | passive | The other end terminal of the LR12 2W metal strip chip resistor; the part is non-polarized and either terminal may be connected to either side of the circuit. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UNI ROYAL Uniroyal Elec |
| Package | 2512 |
| 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 |  |  | 220 |  | mΩ | nominal, catalog attribute (LCSC C2941078) | catalog |
| Tolerance |  | -1 |  | 1 | % | catalog attribute (LCSC C2941078) | catalog |
| Rated power |  |  |  | 2 | W | catalog attribute (LCSC C2941078) | catalog |
| Temperature coefficient | TCR | -50 |  | 50 | ppm/°C | catalog description (LCSC C2941078) | catalog |

## CAD (KiCad official)

- Symbol: `LR122WF220LT4E`
- Footprint: `Resistor_SMD:R_2512_6332Metric`
- 3D model: 2512 (KiCad packages3D, STEP)
- 3D model files: `lr122wf220lt4e-etched.step` / `lr122wf220lt4e-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lr122wf220lt4e.step` / `lr122wf220lt4e.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UNI ROYAL Uniroyal Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590904919094341632) (8 pp, sha256 `9cafe18fe2eb29b6`, retrieved 2026-10-26, 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/lr122wf220lt4e-datasheet.pdf)