# LR123WF390MT4E

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

LR123WF390MT4E 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 | Terminal 1 of an unpolarised resistor; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised resistor; either orientation. |

## 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 |  |  | 39 |  | mΩ | nominal, catalog attribute (LCSC C5775685) | catalog |
| Tolerance |  | -1 |  | 1 | % | catalog attribute (LCSC C5775685) | catalog |
| Rated power |  |  |  | 3 | W | catalog attribute (LCSC C5775685) | catalog |

## CAD (KiCad official)

- Symbol: `LR123WF390MT4E`
- Footprint: `Resistor_SMD:R_2512_6332Metric`
- 3D model: 2512 (KiCad packages3D, STEP)
- 3D model files: `lr123wf390mt4e-etched.step` / `lr123wf390mt4e-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lr123wf390mt4e.step` / `lr123wf390mt4e.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/8603168519089905664) (7 pp, sha256 `e01cdf7929676065`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `two-terminal convention` (convention), consensus `off` (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/lr123wf390mt4e-datasheet.pdf)