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LR123WF270LT4E

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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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LR123WF270LT4E

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

LR123WF270LT4E 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 One of two interchangeable metal-strip terminals of the LR12 2512 chip resistor (Sn solder plated), land pad a = 2.30 mm wide by b = 3.68 mm for 3~350 mΩ values.
2 2 passive Second interchangeable metal-strip terminal of the LR12 2512 chip resistor (Sn solder plated), land pad a = 2.30 mm wide by b = 3.68 mm with i = 3.15 mm gap between pads for 3~350 mΩ values.

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 -1 1 % F=±1% (7th code of MPN) 2
Temperature coefficient of resistance -50 50 PPM/℃ t1 +25℃, t2 125℃ (test temperature) 4
Rated power 3 W 3W type; continuous load at ambient 70℃, derate above 70℃ per Figure 1 2
Short-time overload resistance change ΔR -0.5 0.5 % 4 times rated power (LR12-3W), 5 seconds 4
Load life resistance change ΔR -1 1 % 1000 hours 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 % 1000 hours 85℃/85%RH, 10% of operating power; measured at 24±4 hours after test 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 sec 4
Resistance to solder heat resistance change ΔR -0.5 0.5 % Dip at 260±5℃ for 10±1 seconds 4
Dielectric withstanding surge current limit 50 mA 500 VAC applied for 1 minute; limit surge current 50 mA (max.) 4
Storage temperature (recommended) 15 35 ℃ Recommended warehouse storage condition 6
Storage humidity (recommended) 25 75 %RH Recommended warehouse storage condition 6
Rated ambient temperature 70 ℃ Power rating based on continuous load at this ambient; derate above per Figure 1 4

CAD (KiCad official)

  • Symbol: LR123WF270LT4E
  • Footprint: Resistor_SMD:R_2512_6332Metric
  • 3D model: 2512 (KiCad packages3D, STEP)
  • 3D model files: lr123wf270lt4e-etched.step / lr123wf270lt4e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr123wf270lt4e.step / lr123wf270lt4e.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: UNI ROYAL Uniroyal Elec datasheet (6 pp, sha256 697e24f2047069dc, retrieved 2026-11-05, 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