component
LR122WF680MT4E
Public Made by Adomby adom
UNI ROYAL Uniroyal Elec Current Sense Resistors / Shunt Resistors, 2512. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLR122WF680MT4E
UNI ROYAL Uniroyal Elec · Current Sense Resistors / Shunt Resistors · 2512
LR122WF680MT4E from UNI ROYAL Uniroyal 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 terminal of the 2512 (LR12) metal strip chip resistor, a 2-terminal non-polarized part; the datasheet does not number the terminals, so this follows the two land pads in the recommended land pattern (a=2.30 mm, b=3.68 mm, i=3.15 mm for 3mΩ~350mΩ). |
| 2 | 2 | passive | Second terminal of the 2512 (LR12) metal strip chip resistor, interchangeable with the first terminal; the datasheet does not number the terminals, so this follows the two land pads in the recommended land pattern. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UNI ROYAL Uniroyal Elec |
| Package | 2512 |
| 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 | % | MPN 7th code F = ±1% | 2 | ||
| Temperature coefficient of resistance | TCR | -50 | 50 | PPM/℃ | t1 = +25°C, t2 = 125°C | 4 | |
| Resistance range (2W, thickness 0.70±0.30 mm column) | R | 26 | 350 | mΩ | LR12 2W, 26~350mΩ range | 3 | |
| Short-time overload resistance change | ΔR | -0.5 | 0.5 | % | LR12-2W: 5 times rated power, 5 seconds | 4 | |
| Load life resistance change | ΔR | -1 | 1 | % | 1000 h at rated or max working current (whichever less), 1.5 h ON / 0.5 h OFF, 70±2°C ambient | 4 | |
| High temperature exposure resistance change | ΔR | -1 | 1 | % | 155±2°C for 1000 h | 4 | |
| Biased humidity resistance change | ΔR | -0.5 | 0.5 | % | 85°C/85%RH, 1000 h, 10% of operating power; measured at 24±4 h after test | 4 | |
| Rapid change of temperature resistance change | ΔR | -0.5 | 0.5 | % | 30 min at -55°C and 30 min at 155°C; 100 cycles | 4 | |
| Terminal bending resistance change | ΔR | -0.5 | 0.5 | % | 2 mm, 10 s | 4 | |
| Resistance to solder heat resistance change | ΔR | -0.5 | 0.5 | % | 260±5°C, held 10±1 s | 4 | |
| Solderability (solder coverage) | 95 | % | Solder temperature 245±3°C; dwell 2~3 s | 4 | |||
| Surge current limit in dielectric withstanding test | 50 | mA | Applied 500 VAC for 1 minute | 4 | |||
| Storage temperature (recommended) | 15 | 35 | ℃ | Recommended warehouse storage | 6 | ||
| Storage humidity (recommended) | 25 | 75 | %RH | Recommended warehouse storage | 6 | ||
| Rated power | P | 2 | W | LR12 2W, continuous load | 4 | ||
| Rated ambient temperature for full power | 70 | ℃ | Full rated power at continuous load; derate above 70°C | 4 |
CAD (KiCad official)
- Symbol:
LR122WF680MT4E - Footprint:
Resistor_SMD:R_2512_6332Metric - 3D model: 2512 (KiCad packages3D, STEP)
- 3D model files:
lr122wf680mt4e-etched.step/lr122wf680mt4e-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lr122wf680mt4e.step/lr122wf680mt4e.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UNI ROYAL Uniroyal Elec datasheet (6 pp, sha256
697e24f2047069dc, retrieved 2026-11-06, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).