component
LR123WF350MT4E
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
markdownLR123WF350MT4E
UNI ROYAL Uniroyal Elec · Current Sense Resistors / Shunt Resistors · 2512
LR123WF350MT4E 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 | First terminal of the two-terminal LR12 (2512) metal strip chip resistor (2W/3W, ±1%, 35mΩ), a Sn-plated end electrode with a recommended land pad of 2.30 mm x 3.68 mm for 3~350mΩ values. |
| 2 | 2 | passive | Second terminal of the two-terminal LR12 (2512) metal strip chip resistor (2W/3W, ±1%, 35mΩ), a Sn-plated end electrode with a recommended land pad of 2.30 mm x 3.68 mm for 3~350mΩ values and 3.15 mm gap between pads. |
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 range (3W part) | R | 3 | 350 | mΩ | 3W, 3~350mΩ range from dimension table | 3 | |
| Resistance tolerance | -1 | 1 | % | Tolerance code F = ±1% (7th code of part number) | 2 | ||
| Temperature coefficient of resistance | TCR | -50 | 50 | ppm/°C | t1: +25°C; t2: test temperature 125°C; TCR = (R2-R1)/(R1(t2-t1))×10^6 | 4 | |
| Short-time overload resistance change | ΔR | -0.5 | 0.5 | % | LR12-3W: 4 times rated power for 5 seconds | 4 | |
| Load life resistance change | ΔR | -1 | 1 | % | 1000 hours at rated or max working current (whichever less), duty 1.5 h ON / 0.5 h OFF, 70±2°C ambient | 4 | |
| High temperature exposure resistance change | ΔR | -1 | 1 | % | 155±2°C for 1000 H (MIL-STD-202 108A) | 4 | |
| Biased humidity resistance change | ΔR | -0.5 | 0.5 | % | 85°C/85%RH, 1000 hours, 10% of operating power; measured at 24±4 h after test | 4 | |
| Rapid change of temperature resistance change | ΔR | -0.5 | 0.5 | % | 30 min at -55°C and 30 min at 155°C; 100 cycles | 4 | |
| Terminal bending resistance change | ΔR | -0.5 | 0.5 | % | 2 mm, 10 seconds | 4 | |
| Resistance to solder heat resistance change | ΔR | -0.5 | 0.5 | % | Dip at 260±5°C, hold 10±1 seconds | 4 | |
| Solderability solder coverage | 95 | % | Solder temperature 245±3°C; dwell time 2~3 seconds; coverage of new, clean surface | 4 | |||
| Dielectric withstanding surge current limit | 50 | mA | 500 VAC applied for 1 minute; limit surge current 50 mA (max.) | 4 | |||
| Rated power | P | 3 | W | Continuous load at 70°C ambient; derated above 70°C per Figure 1 | 4 | ||
| Recommended storage temperature | 15 | 35 | °C | Recommended warehouse storage (not operation) | 6 | ||
| Recommended storage humidity | 25 | 75 | %RH | Recommended warehouse storage (not operation) | 6 |
CAD (KiCad official)
- Symbol:
LR123WF350MT4E - Footprint:
Resistor_SMD:R_2512_6332Metric - 3D model: 2512 (KiCad packages3D, STEP)
- 3D model files:
lr123wf350mt4e-etched.step/lr123wf350mt4e-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lr123wf350mt4e.step/lr123wf350mt4e.glbare 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 2026-11-07, 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).