component
LR123WF680MT4E
Public Made by Adomby adom
UNI ROYAL Uniroyal Elec Current Sense Resistors / Shunt Resistors, 2512. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLR123WF680MT4E
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lr123wf680mt4e.step/lr123wf680mt4e.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).