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CMFB 503F3950
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Nanjing Shiheng Elec NTC Thermistors, 0805. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+42@@ -0,0 +1,42 @@+# CMFB 503F3950++**Nanjing Shiheng Elec CMFB 503F3950** · NTC Thermistors · 0805++CMFB 503F3950 from Nanjing Shiheng Elec CMFB 503F3950, in a 0805. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | 1 | passive | External electrode terminal 1 of the two-terminal NTC thermistor. Non-polarized; either terminal may be used as input or output. Resistance between terminals is ~50 kΩ at 25 °C, decreasing with temperature per the R-T table. |+| 2 | 2 | passive | External electrode terminal 2 of the two-terminal NTC thermistor. Non-polarized; interchangeable with terminal 1. Combined with terminal 1 forms the NTC resistance element (50 kΩ ±1% @ 25 °C, B = 3950 K). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Nanjing Shiheng Elec CMFB 503F3950 |+| Package | 0805 |+| Category | Sensor |+| Pins | 2 |++## Ordering variants++- `CMFB 503F3950B`++## CAD (KiCad official)++- Symbol: `CMFB 503F3950`+- Footprint: `Resistor_SMD:R_0805_2012Metric`+- 3D model: 0805 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Nanjing Shiheng Elec CMFB 503F3950 datasheet](docs/cmfb-503f3950-datasheet.pdf) (13 pp, sha256 `b97d3c412e07c2b3`, retrieved 2026-08-17, 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:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/cmfb-503f3950-datasheet.pdf)
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