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LR123WF680MT4E

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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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LR123WF680MT4E

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

LR123WF680MT4E 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 the two metal-strip end terminals (B), non-polar and interchangeable with the other; the LR12 3W part is rated 3W at 70℃ with max rating current 54.77A and max overload current 109.54A for the ≦±50ppm/℃ range.
2 2 passive The other metal-strip end terminal (B), non-polar and interchangeable with pin 1; the LR12 3W part is rated 3W at 70℃ with operating temperature range -55~+170℃.

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 = ±1%) -1 1 % 2
Temperature coefficient of resistance (3W, ≦±50 row) TCR -50 50 ppm/℃ Room temp. (t1) to room temp. +100℃ (t2) 3
Rated power at 70℃ P 3 W Ambient 70℃; derate above 70℃ per Figure 1 3
Max rating current (3W, ≦±50 row) I 54.77 A 3W, TCR ≦±50 row, resistance range 1~100 mΩ 3
Max overload current (3W, ≦±50 row) 109.54 A 3W, TCR ≦±50 row, resistance range 1~100 mΩ 3
Operating temperature range T_op -55 170 ℃ 3
Short-time overload resistance change ΔR -0.5 0.5 % Permanent change after 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℃ ambient 6
High temperature exposure resistance change ΔR -1 1 % 170±2℃ for 1000 h 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 % Dipped at 260±5℃ for 10±1 s 6
Solderability coverage 95 % Solder temperature 245±3℃; dwell 2~3 s 6
Dielectric withstanding voltage 500 VAC Applied for 1 minute; limit surge current 50 mA max 6

CAD (KiCad official)

  • Symbol: LR123WF680MT4E
  • Footprint: Resistor_SMD:R_2512_6332Metric
  • 3D model: 2512 (KiCad packages3D, STEP)
  • 3D model files: lr123wf680mt4e-etched.step / lr123wf680mt4e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr123wf680mt4e.step / lr123wf680mt4e.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