component
LR122WF300MT4E
Public Made by Adomby adom
UNI-ROYAL(Uniroyal Elec) Current Sense Resistors / Shunt Resistors, 2512. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, 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
markdownLR122WF300MT4E
UNI-ROYAL(Uniroyal Elec) · Current Sense Resistors / Shunt Resistors · 2512
LR122WF300MT4E 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 | Terminal 1 of an unpolarised resistor; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised resistor; either orientation. |
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 |
|---|---|---|---|---|---|---|---|
| Temperature coefficient of resistance | -50 | 50 | PPM/℃ | t1 +25℃ (room), t2 125℃ test temperature | 4 | ||
| Resistance tolerance | -1 | 1 | % | Tolerance code F = ±1% | 2 | ||
| Resistance value (nominal) | R | 3 | mΩ | Resistance code 300 with multiplier N (10^-5 Ω) = 3 mΩ; LR12 2W range 3~25mΩ | 2 | ||
| Rated power | P | 2 | W | Continuous load at 70℃ ambient; derate above 70℃ per Figure 1 | 3 | ||
| Short-time overload resistance change | ΔR | -0.5 | 0.5 | % | 5× rated power for 5 s (LR12-2W); also ±0.0005Ω absolute term | 4 | |
| Load life resistance change | ΔR | -1 | 1 | % | 1000 h at 70±2℃, 1.5 h on / 0.5 h off, rated or max working current (whichever less); also ±0.0005Ω absolute term | 4 | |
| High temperature exposure resistance change | ΔR | -1 | 1 | % | 1000 h at 155±2℃; also ±0.0005Ω absolute term | 4 | |
| Biased humidity resistance change | ΔR | -0.5 | 0.5 | % | 1000 h at 85℃/85%RH, 10% of operating power; measured 24±4 h after test; also ±0.0005Ω absolute term | 4 | |
| Rapid change of temperature resistance change | ΔR | -0.5 | 0.5 | % | 30 min at -55℃ and 30 min at 155℃, 100 cycles; also ±0.0005Ω absolute term | 4 | |
| Terminal bending resistance change | ΔR | -0.5 | 0.5 | % | 2 mm, 10 s; also ±0.0005Ω absolute term | 4 | |
| Resistance to solder heat resistance change | ΔR | -0.5 | 0.5 | % | Dip in 260±5℃ for 10±1 s; also ±0.0005Ω absolute term | 4 | |
| Solderability coverage | 95 | % | Solder temperature 245±3℃, dwell 2~3 s; coverage of terminations | 4 |
CAD (KiCad official)
- Symbol:
LR122WF300MT4E - Footprint:
Resistor_SMD:R_2512_6332Metric - 3D model: 2512 (KiCad packages3D, STEP)
- 3D model files:
lr122wf300mt4e-etched.step/lr122wf300mt4e-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lr122wf300mt4e.step/lr122wf300mt4e.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UNI-ROYAL(Uniroyal Elec) datasheet (7 pp, sha256
e01cdf7929676065, retrieved 2026-11-05, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarytwo-terminal convention(convention), consensusoff(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).