component
LR122WF140LT4E
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
markdownLR122WF140LT4E
UNI ROYAL Uniroyal Elec · Current Sense Resistors / Shunt Resistors · 2512
LR122WF140LT4E 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 end terminal of the LR12 2W metal strip chip resistor (6.35 x 3.18 mm body); rated 2W at 70°C, operating range -55 to +170°C. |
| 2 | 2 | passive | Second end terminal of the LR12 2W metal strip chip resistor (6.35 x 3.18 mm body); the part is non-polarized, so the terminals are interchangeable. |
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 range, 1.0% (F) tolerance | 1 | 450 | mΩ | LR12 2W ≦±50 row, 1.0% (F) column | 3 | ||
| Max. rating current | 44.72 | A | LR12 2W ≦±50 row, power at 70℃ | 3 | |||
| Max. overload current | 100 | A | LR12 2W ≦±50 row | 3 | |||
| Rated power | P | 2 | W | Power at 70℃ | 3 | ||
| Operating temperature range | -55 | 170 | ℃ | 3 | |||
| Temperature coefficient of resistance | TCR | -50 | 50 | ppm/℃ | LR12 2W ≦±50 row; room temp to room temp +100℃ | 3 | |
| Resistance tolerance (F code) | -1 | 1 | % | 7th code F = ±1% | 2 | ||
| Short-time overload resistance change | ΔR | -0.5 | 0.5 | % | 5 times power rate for 5 s (JIS-C-5201 4.13) | 6 | |
| Operational life resistance change | ΔR | -1 | 1 | % | 1000 h at rated or max working current, 1.5 h ON / 0.5 h OFF, 70±2℃ ambient | 6 | |
| High temperature exposure resistance change | ΔR | -1 | 1 | % | 170±2℃ for 1000 H (MIL-STD-202 108A) | 6 | |
| Biased humidity resistance change | ΔR | -0.5 | 0.5 | % | 1000 h at 85℃/85%RH, 10% of operating power | 6 | |
| Rapid change of temperature resistance change | ΔR | -0.5 | 0.5 | % | 30 min at -55℃ and 30 min at 170℃; 100 cycles | 6 | |
| Terminal bending resistance change | ΔR | -0.5 | 0.5 | % | 2 mm, 60 s | 6 | |
| Resistance to solder heat resistance change | ΔR | -0.5 | 0.5 | % | Dip at 260±5℃ for 10±1 s | 6 |
CAD (KiCad official)
- Symbol:
LR122WF140LT4E - Footprint:
Resistor_SMD:R_2512_6332Metric - 3D model: 2512 (KiCad packages3D, STEP)
- 3D model files:
lr122wf140lt4e-etched.step/lr122wf140lt4e-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lr122wf140lt4e.step/lr122wf140lt4e.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UNI ROYAL Uniroyal Elec datasheet (8 pp, sha256
9cafe18fe2eb29b6, retrieved 2026-11-07, 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).