# HoLLR1206-1W-3mR-1%

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

HoLLR1206-1W-3mR-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 | Terminal 1 of an unpolarised resistor; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised resistor; either orientation. |

## 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 |
|---|---|---|---|---|---|---|---|
| Tolerance (F = ±1%) |  | -1 |  | 1 | % | Tolerance letter F in part number (1%) | 1 |
| Temperature coefficient of resistance | TCR | -50 |  | 50 | ppm/°C | Range 1 mΩ-35 mΩ; R1 at room T, R2 at 125 °C (JIS C 5201) | 2 |
| Nominal resistance | R |  | 3 |  | mΩ | Value 3mR as decoded from the part number (3 mΩ) | 1 |
| Rated power | P |  | 1 | 1 | W | HoLLR1206 1W rating; derate above 70 °C per power curve | 2 |
| Operating temperature range | T | -55 |  | 170 | °C | Use temperature range as printed | 2 |
| Short time overload resistance change | ΔR/R | -0.5 |  | 0.5 | % | 2x rated power for 5 s, rest 24 h, then measured | 5 |
| Biased humidity resistance change | ΔR/R | -0.5 |  | 0.5 | % | 85 °C, 85 %RH, rated current 90 min ON / 30 min OFF, 1000 h | 5 |
| Temperature cycling resistance change | ΔR/R | -0.5 |  | 0.5 | % | -55 °C to +125 °C, 1000 cycles | 5 |
| Low temperature exposure resistance change | ΔR/R | -0.5 |  | 0.5 | % | -55 °C, 1000 h storage | 5 |
| High temperature exposure resistance change | ΔR/R | -1 |  | 1 | % | 170 °C, 1000 h storage | 6 |
| Load life resistance change | ΔR/R | -1 |  | 1 | % | 70 °C oven, rated current 90 min ON / 30 min OFF, 1000 h | 6 |
| Resistance to solder heat resistance change | ΔR/R | -0.5 |  | 0.5 | % | 260 ±5 °C solder bath, 10 ±1 s | 6 |
| Resistance to solvent resistance change | ΔR/R | -0.5 |  | 0.5 | % | Isopropyl alcohol 20-25 °C, 60 ±5 s | 6 |
| Joint strength of solder resistance change | ΔR/R | -0.5 |  | 0.5 | % | Bend test board, load applied at centre | 6 |
| Insulation resistance | IR | 100 |  |  | MΩ | 100 VDC applied for 1 min, electrodes to protective layer and substrate | 6 |

## CAD (KiCad official)

- Symbol: `HoLLR1206-1W-3mR-1%`
- Footprint: `Resistor_SMD:R_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `hollr1206-1w-3mr-1-etched.step` / `hollr1206-1w-3mr-1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `hollr1206-1w-3mr-1.step` / `hollr1206-1w-3mr-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/8590231145209233408) (7 pp, sha256 `881128cf8909c33d`, retrieved 2026-10-17, 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/hollr1206-1w-3mr-1-datasheet.pdf)