component
LRAN12SFTR040
Public Made by Adomby adom
NCT Current Sense Resistors/Shunt Resistors, 1206. 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
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLRAN12SFTR040
NCT · Current Sense Resistors/Shunt Resistors · 1206
LRAN12SFTR040 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 | Terminal 1 of an unpolarised resistor; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised resistor; either orientation. |
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 | |||
| Solderability (new solder area on electrodes) | 95 | % | Immersed 3 ±1 s in 245 ±5 °C solder bath | 9 | |||
| Resistance tolerance (F) | -1 | 1 | % | Tolerance letter F = 1% (part-number table) | 3 | ||
| Temperature coefficient of resistance | TCR | -50 | 50 | ppm/°C | 4 | ||
| Resistance change, short time overload | -0.5 | 0.5 | % | 5 s overload at 5x rated power, then 24 h rest | 8 | ||
| Resistance change, biased humidity | -0.5 | 0.5 | % | 85 ±5 °C, 85 ±5 %RH, rated current 1000 h (90 min ON / 30 min OFF) | 8 | ||
| Resistance change, temperature cycling | -0.5 | 0.5 | % | -55 °C to +125 °C, 1000 cycles | 8 | ||
| Resistance change, low temperature exposure (storage) | -0.5 | 0.5 | % | -55 ±2 °C, 1000 h, then 1 h rest | 8 | ||
| Resistance change, high temperature exposure (storage) | -1 | 1 | % | 170 °C oven, 1000 h, then 1 h rest | 9 | ||
| Resistance change, load life | -1 | 1 | % | 70 ±2 °C, rated current, 1000 h (90 min ON / 30 min OFF) | 9 | ||
| Resistance change, resistance to solder heat | -0.5 | 0.5 | % | 260 ±5 °C solder bath, 10 ±1 s | 9 | ||
| Resistance change, resistance to solvent | -0.5 | 0.5 | % | Isopropanol 20-25 °C, 60 ±5 s | 9 | ||
| Resistance change, joint strength of solder | -0.5 | 0.5 | % | Bend test on test board under load | 9 | ||
| Nominal resistance (this MPN, R040) | R | 40 | mΩ | 3 | |||
| Rated power (0.5W series, 40mΩ-100mΩ) | P | 0.5 | W | Derate above 70 °C per power derating curve (section 7) | 4 | ||
| Maximum rated current (0.5W, 40mΩ-100mΩ) | 3.54 | A | I = SQRT(P/R) | 4 | |||
| Maximum overload current (0.5W, 40mΩ-100mΩ) | 7.91 | A | 4 | ||||
| Operating temperature range | -55 | 170 | °C | Operating temperature range (使用温度范围) | 4 | ||
| Storage temperature | 5 | 35 | °C | Sealed storage, 2 years shelf life | 11 | ||
| Storage relative humidity | 40 | 75 | %RH | Sealed storage, 2 years shelf life | 11 |
CAD (KiCad official)
- Symbol:
LRAN12SFTR040 - Footprint:
Resistor_SMD:R_1206_3216Metric - 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files:
lran12sftr040-etched.step/lran12sftr040-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lran12sftr040.step/lran12sftr040.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: NCT datasheet (12 pp, sha256
9468aafd42725899, retrieved 2026-10-20, 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, 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).