PRF21BB471QB5RA from Murata Electronics, 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	Terminal 1 of the PTC thermistor. Two-terminal chip device; terminals are symmetric and non-polar. Nominal resistance ~470Ω at 25°C, rising sharply above the 115°C detection temperature.
2	2	passive	Terminal 2 of the PTC thermistor. Two-terminal chip device; terminals are symmetric and non-polar. Maximum applied voltage between terminals is 32V.

Key specifications

Parameter	Value
Manufacturer	Murata Electronics
Package	0805
Category	Sensor
Pins	2

Ordering variants

Same part, different packaging or reel option.

PRF21BB471QB5RA
PRF21BB471QB5RARB
PRF21BB471QB5RARC
PRF21BB471QB5RARL

CAD (KiCad official)

Symbol: PRF21BB471QB5RA
Footprint: Resistor_SMD:R_0805_2012Metric
3D model: 0805 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`prf21bb471qb5ra.step`	40 KB	You want the bare part, or you mark your own boards.
`prf21bb471qb5ra-etched.step`	2.4 MB	You want the part with `PRF21BB471QB5RA` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 607 faces against 26 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Murata Electronics datasheet (3 pp, sha256 0cd928c15238c562, 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