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LR122WF140LT4E

Public Made by Adom

by adom

UNI ROYAL Uniroyal Elec Current Sense Resistors / Shunt Resistors, 2512. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LR122WF140LT4E

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr122wf140lt4e.step / lr122wf140lt4e.glb are 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, 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