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LR122WF280MT4E

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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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LR122WF280MT4E

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

LR122WF280MT4E 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
Resistance tolerance (F code = ±1%) -1 1 % Part code 7th digit F = ±1% 2
Temperature coefficient (TCR) TCR -50 50 ppm/℃ LR12 2W ≦±50 row; R1 at room temp, R2 at room temp +100℃ (JIS C 5201-1 4.8) 3
Rated power at 70℃ P 2 W Power rating at 70℃ ambient; derate above 70℃ per Figure 1 (no numeric derating given) 3
Max rating current 44.72 A LR12 2W ≦±50 row, resistance range 16~450 mΩ 3
Max overload current 100 A LR12 2W ≦±50 row, resistance range 16~450 mΩ 3
Operating temperature range T -55 170 ℃ Printed as -55~+170℃ for LR series 3
Nominal resistance R 28 mΩ Decoded from MPN code 280M: 280 × 10^-4 Ω = 28 mΩ 2
Short-time overload resistance change ΔR -0.5 0.5 % Potential of 5 times power rate applied for 5 seconds 6
Operational 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 6
High temperature exposure resistance change ΔR -1 1 % Exposed to 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; measured 24±4 h after test 6
Rapid temperature change 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 in 260±5℃ for 10±1 s 6

CAD (KiCad official)

  • Symbol: LR122WF280MT4E
  • Footprint: Resistor_SMD:R_2512_6332Metric
  • 3D model: 2512 (KiCad packages3D, STEP)
  • 3D model files: lr122wf280mt4e-etched.step / lr122wf280mt4e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr122wf280mt4e.step / lr122wf280mt4e.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 2026-10-17, 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