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LR122WF180MT4E

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by 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.

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LR122WF180MT4E

UNI ROYAL Uniroyal Elec · Current Sense Resistors / Shunt Resistors · 2512

LR122WF180MT4E 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 (T.C.R.) TCR -50 50 ppm/°C LR12 2W, ≦±50 row; R1 at room temp, R2 at room temp +100 °C 3
Resistance tolerance (7th code F) -1 1 % MPN 7th code F = ±1% 2
Rated power 2 W Continuous load at 70 °C ambient (LR12 2W) 3
Max rating current 44.72 A LR12 2W, ≦±50 row 3
Max overload current 100 A LR12 2W, ≦±50 row 3
Operating temperature range -55 170 °C 3
Short-time overload resistance change ΔR -0.5 0.5 % Potential of 5 times power rate for 5 seconds 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 °C ambient 6
High temperature exposure resistance change ΔR -1 1 % 170±2 °C for 1000 h 6
Biased humidity resistance change ΔR -0.5 0.5 % 85 °C/85%RH, 1000 h, 10% of operating power 6
Rapid change of temperature resistance change ΔR -0.5 0.5 % 30 min at -55 °C and 30 min at 170 °C; 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 °C, hold 10±1 s 6
Solderability coverage 95 % Solder at 245±3 °C, dwell 2~3 s 6

CAD (KiCad official)

  • Symbol: LR122WF180MT4E
  • Footprint: Resistor_SMD:R_2512_6332Metric
  • 3D model: 2512 (KiCad packages3D, STEP)
  • 3D model files: lr122wf180mt4e-etched.step / lr122wf180mt4e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr122wf180mt4e.step / lr122wf180mt4e.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 2026-10-21, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary two-terminal convention (convention), consensus off (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