# JER1206F1R004

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

JER1206F1R004 from jieerrui, 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 | First terminal electrode of the 4 mΩ (R004) 1% current-sense resistor, electrode width 0.50±0.20 mm, rated 1 W at up to 70 °C ambient and derated linearly above that to +170 °C. |
| 2 | 2 | passive | Second terminal electrode of the 4 mΩ (R004) 1% current-sense resistor, electrode width 0.50±0.20 mm, interchangeable with the first terminal, with TCR ±50 ppm/°C for 2 mΩ to 100 mΩ. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | jieerrui |
| 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%) |  | -1 |  | 1 | % |  | 1 |
| Nominal resistance (decoded from R004 = 4 mΩ) | R |  | 4 |  | mΩ |  | 1 |
| Maximum rated power (1206, 1W) | P |  |  | 1 | W | 1206 type; derate above 70℃ ambient per curve | 2 |
| Temperature coefficient of resistance (TCR) | TCR | -50 |  | 50 | ppm/℃ | 1206, 1W, 2mΩ~100mΩ range | 2 |
| Resistance range | R | 1 |  | 100 | mΩ | 1206, 1W | 2 |
| Insulation resistance |  | 100 |  |  | MΩ | 1206 type | 2 |
| Operating temperature range |  | -55 |  | 170 | ℃ |  | 3 |
| Short time overload ΔR | ΔR | -1 |  | 1 | % | 5.0× rated power for 5 s | 6 |
| Temperature cycling ΔR | ΔR | -1 |  | 1 | % | -55℃/+125℃, 1000 cycles | 6 |
| High temperature exposure ΔR | ΔR | -1 |  | 1 | % | 125℃, 1000 h | 6 |
| Low temperature operation ΔR | ΔR | -1 |  | 1 | % | -55℃, 45 min | 6 |
| Biased humidity ΔR | ΔR | -1 |  | 1 | % | 10% rated power, 85℃/85%RH, 1000 h | 6 |
| Operational life ΔR | ΔR | -1 |  | 1 | % | 70±2℃, rated current 1.5 h on / 0.5 h off, 1000 h | 7 |
| Vibration ΔR | ΔR | -1 |  | 1 | % | 5g, 10-2000 Hz, 12 cycles, 20 min | 7 |
| Resistance to solder heat ΔR | ΔR | -1 |  | 1 | % | 260±5℃, 10±1 s | 6 |
| Terminal bending ΔR | ΔR | -1 |  | 1 | % | 2 mm deflection, 60 s | 7 |
| Mechanical shock ΔR | ΔR | -1 |  | 1 | % | 100g, half sine, 6 ms | 7 |
| Terminal strength ΔR | ΔR | -1 |  | 1 | % | 17.7 N, 60±1 s | 7 |
| Thermal shock ΔR | ΔR | -1 |  | 1 | % | -55/+125℃, 300 cycles | 7 |
| ESD ΔR | ΔR | -1 |  | 1 | % | 2 kV, 2 times | 7 |

## CAD (KiCad official)

- Symbol: `JER1206F1R004`
- Footprint: `Resistor_SMD:R_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `jer1206f1r004-etched.step` / `jer1206f1r004-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `jer1206f1r004.step` / `jer1206f1r004.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [jieerrui datasheet](docs/jer1206f1r004-datasheet.pdf) (7 pp, sha256 `6c0d359d39546b43`, 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/jer1206f1r004-datasheet.pdf)