# YLR12-3-40F-W

**Shenzhen Yezhan Elec** · Current Sense Resistors / Shunt Resistors · 2512

YLR12-3-40F-W from Shenzhen Yezhan 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 | First Ni/Sn-plated Cu terminal of the 2512 (YLR12) metal-strip current-sense resistor, 40 mΩ ±1% (F), rated 3 W at 70°C with ±50 ppm/°C, operating range -65°C to 170°C, 500V withstand voltage. |
| 2 | 2 | passive | Second Ni/Sn-plated Cu terminal of the 2512 (YLR12) metal-strip current-sense resistor, interchangeable with the first (non-polarized), recommended pad length L 4.1 mm and gap a 2.1 mm for 2-200 mΩ values. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Yezhan 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 |  |  | 40 |  | mΩ | nominal, catalog attribute (LCSC C489555) | catalog |
| Tolerance |  | -1 |  | 1 | % | catalog attribute (LCSC C489555) | catalog |
| Rated power |  |  |  | 3 | W | catalog attribute (LCSC C489555) | catalog |
| Temperature coefficient | TCR | -50 |  | 50 | ppm/°C | catalog description (LCSC C489555) | catalog |

## CAD (KiCad official)

- Symbol: `YLR12-3-40F-W`
- Footprint: `Resistor_SMD:R_2512_6332Metric`
- 3D model: 2512 (KiCad packages3D, STEP)
- 3D model files: `ylr12-3-40f-w-etched.step` / `ylr12-3-40f-w-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ylr12-3-40f-w.step` / `ylr12-3-40f-w.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shenzhen Yezhan Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588937082546884608) (11 pp, sha256 `bf1e3940062c9a02`, retrieved 2026-10-27, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/ylr12-3-40f-w-datasheet.pdf)