# HoYLR1206-1W-40mR-1%

**Milliohm** · Current Sense Resistors / Shunt Resistors · 1206

HoYLR1206-1W-40mR-1% from Milliohm, 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 | 1 | passive | One terminal electrode of the 1206 alloy current-sense resistor (E=0.6±0.2 mm), 1W rated power, maximum operating voltage (P*R)^½. |
| 2 | 2 | passive | Second terminal electrode of the 1206 alloy current-sense resistor (E=0.6±0.2 mm), interchangeable with the other terminal as the part is non-polarized. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Milliohm |
| Package | 1206 |
| Category | Resistors |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Resistance tolerance (F = ±1%, printed as 1% in part number) |  | -1 |  | 1 | % |  | 2 |
| Temperature coefficient of resistance (TCR) | TCR | -50 |  | 50 | ppm/℃ | 4mΩ≤R<100mΩ | 2 |
| Operating temperature range |  | -55 |  | 170 | ℃ | 1206 1W, electrical specifications table | 2 |
| Insulation resistance |  | 100 |  |  | MΩ | 100V±15V DC between electrode and substrate, held 60 s | 2 |
| Short time overload resistance change | △R | -1 |  | 1 | % | 5 times rated power, 5 s | 3 |
| Short time overload resistance change (absolute term) | △R | -0.05 |  | 0.05 | mΩ | 5 times rated power, 5 s | 3 |
| Resistance to soldering heat resistance change | △R | -0.5 |  | 0.5 | % | 270℃±5℃ tin tank, 10s±1s | 3 |
| Resistance to soldering heat resistance change (absolute term) | △R | -0.05 |  | 0.05 | mΩ | 270℃±5℃ tin tank, 10s±1s | 3 |
| Bending test resistance change | △R | -0.5 |  | 0.5 | % | Bending distance 2mm, hold 60s±5s | 3 |
| Bending test resistance change (absolute term) | △R | -0.05 |  | 0.05 | mΩ | Bending distance 2mm, hold 60s±5s | 3 |
| High temperature exposure resistance change | △R | -1 |  | 1 | % | 170℃±2℃, 1000H, stand 1H before test | 3 |
| High temperature exposure resistance change (absolute term) | △R | -0.05 |  | 0.05 | mΩ | 170℃±2℃, 1000H, stand 1H before test | 3 |
| Low temperature exposure resistance change | △R | -0.5 |  | 0.5 | % | -55℃±2℃, 1000H, stand 1H before test | 3 |
| Low temperature exposure resistance change (absolute term) | △R | -0.05 |  | 0.05 | mΩ | -55℃±2℃, 1000H, stand 1H before test | 3 |
| Temperature cycling resistance change | △R | -0.5 |  | 0.5 | % | -55℃ to 155℃, 1000 cycles | 3 |
| Temperature cycling resistance change (absolute term) | △R | -0.05 |  | 0.05 | mΩ | -55℃ to 155℃, 1000 cycles | 3 |
| Load life resistance change | △R | -1 |  | 1 | % | 70℃±2℃, 1000 hours, rated power 1.5 h on / 0.5 h off | 3 |
| Load life resistance change (absolute term) | △R | -0.05 |  | 0.05 | mΩ | 70℃±2℃, 1000 hours, rated power 1.5 h on / 0.5 h off | 3 |
| Moisture with load resistance change | △R | -1 |  | 1 | % | 85℃±2℃, 85%±3%RH, 1000 hours, rated power 1.5 h on / 0.5 h off | 3 |
| Moisture with load resistance change (absolute term) | △R | -0.05 |  | 0.05 | mΩ | 85℃±2℃, 85%±3%RH, 1000 hours, rated power 1.5 h on / 0.5 h off | 3 |
| Rated power | P |  | 1 |  | W | 1206 1W | 2 |

## CAD (KiCad official)

- Symbol: `HoYLR1206-1W-40mR-1%`
- Footprint: `Resistor_SMD:R_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `hoylr1206-1w-40mr-1-etched.step` / `hoylr1206-1w-40mr-1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `hoylr1206-1w-40mr-1.step` / `hoylr1206-1w-40mr-1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Milliohm datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603168490086023168) (5 pp, sha256 `a94c635020a6da4a`, retrieved 2026-10-19, 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` (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/hoylr1206-1w-40mr-1-datasheet.pdf)