component
QN0805X203J3950FB
Public Made by Adomby adom
QAMcn(恭成科技) NTC Thermistors, 0805. 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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Contents
README
markdownQN0805X203J3950FB
QAMcn(恭成科技) · NTC Thermistors · 0805
QN0805X203J3950FB from QAMcn(恭成科技), in a 0805. 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 | QAMcn(恭成科技) |
| Package | 0805 |
| Category | Sensors |
| 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 (code J) | R25 | -5 | 5 | % | Tolerance code J = ±5% per part-numbering table | 3 | |
| B constant tolerance (code F) | B | -1 | 1 | % | B-constant tolerance code F = ±1% per part-numbering table | 3 | |
| Zero-power resistance at 25°C (R-T table, R_Min / R_Cent / R_Max) | R25 | 19 | 20 | 21 | Kohm | 25°C; R-T table row 25, Res TOL 5.00% | 13 |
| Resistance at -40°C (R-T table) | R | 633.194 | 690.55 | 751.218 | Kohm | R-T table row -40 (R_Min / R_Cent / R_Max) | 12 |
| Resistance at 0°C (R-T table) | R | 61.61 | 65.628 | 69.733 | Kohm | R-T table row 0 (R_Min / R_Cent / R_Max) | 12 |
| Resistance at 85°C (R-T table) | R | 1.978 | 2.129 | 2.286 | Kohm | R-T table row 85 (R_Min / R_Cent / R_Max) | 14 |
| Resistance at 125°C (R-T table) | R | 0.626 | 0.682 | 0.741 | Kohm | R-T table row 125 (R_Min / R_Cent / R_Max) | 15 |
| Operating ambient temperature | -40 | 125 | ℃ | Operating ambient temperature | 3 | ||
| Resistance change after resistance to soldering heat | /ΔR25/R25/ | -2 | 2 | % | After resistance to soldering heat test (260±5℃, 10±1 s); requirement /ΔR25/R25/ ≤ 2% | 6 | |
| B constant change after resistance to soldering heat | /ΔB/B/ | -1 | 1 | % | After resistance to soldering heat test (260±5℃, 10±1 s); requirement /ΔB/B/ ≤ 1% | 6 | |
| Thermal time constant | 5 | s | Zero-power; time for 63.2% of temperature change (printed <5) | 3 | |||
| Zero-power resistance (nominal) | R25 | 20 | kΩ | 25°C; measured at 25±0.05°C with power ≤0.1 mW | 3 | ||
| B constant (25/50°C) | B | 3950 | K | 25/50°C; measured at 25±0.05°C and 50±0.05°C | 3 | ||
| B constant (25/85°C) reference | B | 3987 | K | 25/85°C; printed as ref. value | 3 | ||
| Rated electric power | 100 | mW | 25°C, still air; power that raises surface temperature by 100°C | 3 | |||
| Permissible operating current | 2 | mA | 25°C, still air; current causing 1°C self-heating rise | 3 | |||
| Dissipation factor | δ | 0.32 | mW/℃ | 25°C still air; single unit without mounting; power to raise body temperature 1°C | 3 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | PC | The current that keep body temperature of chip NTC on the PC board in still air | 5 |
CAD (KiCad official)
- Symbol:
QN0805X203J3950FB - Footprint:
Resistor_SMD:R_0805_2012Metric - 3D model: 0805 (KiCad packages3D, STEP)
- 3D model files:
qn0805x203j3950fb-etched.step/qn0805x203j3950fb-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);qn0805x203j3950fb.step/qn0805x203j3950fb.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: QAMcn(恭成科技) datasheet (15 pp, sha256
948ce3556cc10635, retrieved 2026-10-17, 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).