component
LR122WF390MT4E
Public Made by Adomby 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.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownLR122WF390MT4E
UNI ROYAL Uniroyal Elec · Current Sense Resistors / Shunt Resistors · 2512
LR122WF390MT4E 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 | -1 | 1 | % | F = ±1% (7th code of part number) | 2 | ||
| Temperature coefficient of resistance | TCR | -50 | 50 | ppm/°C | t1 +25°C or specified room temperature; t2 test temperature 125°C | 4 | |
| Short-time overload ΔR | -0.5 | 0.5 | % | LR12-2W: 5 times rated power for 5 seconds | 4 | ||
| Load life ΔR | -1 | 1 | % | 1000 h at rated or max working current (whichever less), 1.5 h on / 0.5 h off, 70±2°C ambient | 4 | ||
| High temperature exposure ΔR | -1 | 1 | % | 155±2°C for 1000 h | 4 | ||
| Biased humidity ΔR | -0.5 | 0.5 | % | 1000 h at 85°C/85%RH, 10% of operating power; measured at 24±4 h after test | 4 | ||
| Rapid change of temperature ΔR | -0.5 | 0.5 | % | 30 min at -55°C and 30 min at 155°C; 100 cycles | 4 | ||
| Terminal bending ΔR | -0.5 | 0.5 | % | 2 mm, 10 s | 4 | ||
| Resistance to solder heat ΔR | -0.5 | 0.5 | % | Dip at 260±5°C, hold 10±1 s | 4 | ||
| Dielectric withstanding surge current | 50 | mA | Applied 500 VAC for 1 minute; limit surge current | 4 | |||
| Solderability coverage | 95 | % | Solder temperature 245±3°C; dwell 2~3 s | 4 | |||
| Rated power | P | 2 | W | Continuous load at 70°C ambient; derate above 70°C per Figure 1 | 2 | ||
| Rated ambient temperature for rated power | 70 | °C | Continuous load operation; derating above 70°C | 4 | |||
| Reflow peak temperature (Tp) | Tp | 260 | °C | Recommended Pb-free reflow profile; time within +0/-5°C of peak 10 s | 5 | ||
| Allowed re-flow times | 2 | times | Recommended reflow profile | 5 | |||
| Recommended storage temperature | 15 | 35 | °C | Warehouse storage recommended by UNI-ROYAL | 6 | ||
| Recommended storage humidity | 25 | 75 | %RH | Warehouse storage recommended by UNI-ROYAL | 6 |
CAD (KiCad official)
- Symbol:
LR122WF390MT4E - Footprint:
Resistor_SMD:R_2512_6332Metric - 3D model: 2512 (KiCad packages3D, STEP)
- 3D model files:
lr122wf390mt4e-etched.step/lr122wf390mt4e-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lr122wf390mt4e.step/lr122wf390mt4e.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 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarytwo-terminal convention(convention), consensusoff(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).