# WK73R2BTTD21R0F

**KOA Speer Elec** · Chip Resistor - Surface Mount · 0612

WK73R2BTTD21R0F from KOA Speer Elec, in a 0612. 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 | KOA Speer Elec |
| Package | 0612 |
| 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 |  |  | 21 |  | Ω | nominal, catalog attribute (LCSC C340328) | catalog |
| Tolerance |  | -1 |  | 1 | % | catalog attribute (LCSC C340328) | catalog |
| Rated power |  |  |  | 750 | mW | catalog attribute (LCSC C340328) | catalog |
| Temperature coefficient | TCR | -100 |  | 100 | ppm/°C | catalog description (LCSC C340328) | catalog |
| Operating temperature |  | -55 |  | 155 | °C | catalog description (LCSC C340328) | catalog |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  |  | Wide Terminal Type Flat Chip Resistors 外观颜色：黑色 Coating color：Black | 1 |

## CAD (KiCad official)

- Symbol: `WK73R2BTTD21R0F`
- Footprint: `Resistor_SMD:R_0612_1632Metric`
- 3D model: 0612 (KiCad packages3D, STEP)
- 3D model files: `wk73r2bttd21r0f-etched.step` / `wk73r2bttd21r0f-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `wk73r2bttd21r0f.step` / `wk73r2bttd21r0f.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KOA Speer Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588930736975433728) (2 pp, sha256 `04dac8ee42ca6e19`, retrieved 2026-10-16, 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`, 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/wk73r2bttd21r0f-datasheet.pdf)