component
LRAN12CFTR039
Public Made by Adomby adom
NCT Current Sense Resistors/Shunt Resistors, 1206. 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
markdownLRAN12CFTR039
NCT · Current Sense Resistors/Shunt Resistors · 1206
LRAN12CFTR039 from NCT, in a 1206. 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 electrode of the 2-terminal LRAN12 alloy current-sense resistor (3.2 x 1.6 mm body), rated 1 W for 1 mΩ to 39 mΩ and max rated current 31.62 A; the datasheet does not mark which end is pin 1 and the part is non-polarized. |
| 2 | 2 | passive | Second terminal electrode of the 2-terminal LRAN12 alloy current-sense resistor, with resistance measured 4-wire at the back electrodes and rated power derated above 70 °C to zero at 170 °C. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | NCT |
| Package | 1206 |
| 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 |
|---|---|---|---|---|---|---|---|
| Insulation resistance | 100 | MΩ | 100 VDC applied 1 min between electrodes and protective layer / substrate | 9 | |||
| Resistance tolerance | -1 | 1 | % | Tolerance code F (1%) per part-numbering table | 3 | ||
| Nominal resistance | R | 39 | mΩ | Part code R039; 4-wire measurement at back electrodes | 3 | ||
| Temperature coefficient of resistance | TCR | -50 | 50 | ppm/°C | Per TCR test: R1 at room temperature, R2 at 125 °C | 4 | |
| Rated power | 1 | W | 1W row (1mΩ~39mΩ); derate above 70 °C per curve | 4 | |||
| Maximum rated current | 31.62 | A | 1W row, which covers 1mΩ~39mΩ; printed value applies to the row | 4 | |||
| Maximum overload current | 70.71 | A | 1W row, which covers 1mΩ~39mΩ; printed value applies to the row | 4 | |||
| Operating temperature range | -55 | 170 | °C | 4 | |||
| Short time overload resistance change | ΔR/R | -0.5 | 0.5 | % | 5 s at 5x rated power, then 24 h rest | 8 | |
| Biased humidity resistance change | ΔR/R | -0.5 | 0.5 | % | 85 °C, 85 %RH, rated current, 90 min ON / 30 min OFF, 1000 h | 8 | |
| Temperature cycling resistance change | ΔR/R | -0.5 | 0.5 | % | -55 °C to +125 °C, 1000 cycles | 8 | |
| Low temperature exposure resistance change | ΔR/R | -0.5 | 0.5 | % | -55 °C, 1000 h | 8 | |
| High temperature exposure resistance change | ΔR/R | -1 | 1 | % | 170 °C, 1000 h | 9 | |
| Load life resistance change | ΔR/R | -1 | 1 | % | 70 °C, rated current, 90 min ON / 30 min OFF, 1000 h | 9 | |
| Resistance to solder heat resistance change | ΔR/R | -0.5 | 0.5 | % | 260 °C solder bath, 10 s | 9 | |
| Resistance to solvent resistance change | ΔR/R | -0.5 | 0.5 | % | Isopropanol, 20-25 °C, 60 s | 9 | |
| Joint strength of solder resistance change | ΔR/R | -0.5 | 0.5 | % | Bend test on solder joint test board | 9 |
CAD (KiCad official)
- Symbol:
LRAN12CFTR039 - Footprint:
Resistor_SMD:R_1206_3216Metric - 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files:
lran12cftr039-etched.step/lran12cftr039-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lran12cftr039.step/lran12cftr039.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: NCT datasheet (12 pp, sha256
9468aafd42725899, retrieved 2026-11-07, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).