# CMFB503F3950HANT

**FH Guangdong Fenghua Advanced Tech** · NTC Thermistors · 0805

CMFB503F3950HANT from FH Guangdong Fenghua Advanced Tech, 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 | Terminal 1 | passive | One of the two non-polar end-termination electrodes (Ni plating + solder plating) of the 2.0×1.2 mm chip NTC thermistor, R25 = 50 kΩ ±1%, B(25/50) = 3950 K. |
| 2 | Terminal 2 | passive | The other non-polar end-termination electrode (Ni plating + solder plating) of the 2.0×1.2 mm chip NTC thermistor, R25 = 50 kΩ ±1%, B(25/50) = 3950 K. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | FH Guangdong Fenghua Advanced Tech |
| 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 |
|---|---|---|---|---|---|---|---|
| Rated resistance (R25) | R25 |  | 50 |  | kΩ | Decoded from MPN code 503 (50 kΩ); printed in the 0805 table as CMFB503□4050 HANT | 4 |
| Resistance tolerance at 25°C | R25 | -1 |  | 1 | % | Tolerance code F in MPN; printed as ±1 in the tolerance code table | 1 |
| B value (B25/50) | B25/50 |  | 3950 |  | K | Decoded from MPN code 3950; the 0805 table lists 50 kΩ only at 4050 K | 4 |
| Resistance change after resistance to soldering heat | R25 | -5 |  | 5 | % | Preheat 120~150°C 60 s; solder 260±5°C, 10±1 s | 6 |
| Resistance change after flexure strength test | R25 | -5 |  | 5 | % | Bend 1.0 mm for 0805/1206; speed 0.5 mm/s | 6 |
| Resistance change after reliability tests | R25 | -5 |  | 5 | % |  | 6 |
| B value change after reliability tests | B25/50 | -2 |  | 2 | % |  | 6 |

## CAD (KiCad official)

- Symbol: `CMFB503F3950HANT`
- Footprint: `Resistor_SMD:R_0805_2012Metric`
- 3D model: 0805 (KiCad packages3D, STEP)
- 3D model files: `cmfb503f3950hant-etched.step` / `cmfb503f3950hant-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cmfb503f3950hant.step` / `cmfb503f3950hant.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [FH Guangdong Fenghua Advanced Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590920773693349888) (8 pp, sha256 `01b03dd4c210150b`, retrieved 2026-10-18, 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`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-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).

[Datasheet PDF](docs/cmfb503f3950hant-datasheet.pdf)