component
LR122WF250LT4E
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
markdownLR122WF250LT4E
UNI-ROYAL(Uniroyal Elec) · Current Sense Resistors / Shunt Resistors · 2512
LR122WF250LT4E 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 | TCR | -50 | 50 | ppm/℃ | R2-R1/(R1×(t2-t1))×10^6; t1 +25℃, t2 125℃ test temperature | 4 | |
| Resistance tolerance (F = ±1%) | -1 | 1 | % | 7th part-number code F = ±1% | 2 | ||
| Resistance range, LR12 2W | R | 26 | 350 | mΩ | LR12 2W, 26 |
3 | |
| Rated power | P | 2 | W | continuous load at 70℃ ambient; derate above 70℃ per Figure 1 | 3 | ||
| Solderability, coverage | 95 | % | solder 245±3℃, dwell 2~3 s | 4 | |||
| Short-time overload, resistance change | ΔR | -0.5 | 0.5 | % | LR12-2W: 5× rated power for 5 s | 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℃ ambient | 4 | |
| High temperature exposure, resistance change | ΔR | -1 | 1 | % | 155±2℃ for 1000 h (MIL-STD-202 108A) | 4 | |
| Biased humidity, resistance change | ΔR | -0.5 | 0.5 | % | 85℃/85%RH, 1000 h, 10% of operating power | 4 | |
| Rapid change of temperature, resistance change | ΔR | -0.5 | 0.5 | % | 30 min at -55℃ and 30 min at 155℃; 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℃ held for 10±1 s | 4 | |
| Dielectric withstanding, limit surge current | 50 | mA | applied 500 VAC for 1 minute | 4 | |||
| Reflow peak temperature | Tp | 260 | ℃ | Pb-free reflow profile; time within +0/-5℃ of peak 10 s; max 2 reflow passes | 5 | ||
| Recommended storage temperature | 15 | 35 | ℃ | warehouse storage recommended by manufacturer | 7 | ||
| Recommended storage humidity | 25 | 75 | %RH | warehouse storage recommended by manufacturer | 7 |
CAD (KiCad official)
- Symbol:
LR122WF250LT4E - Footprint:
Resistor_SMD:R_2512_6332Metric - 3D model: 2512 (KiCad packages3D, STEP)
- 3D model files:
lr122wf250lt4e-etched.step/lr122wf250lt4e-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lr122wf250lt4e.step/lr122wf250lt4e.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 2026-10-17, 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).