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POSISTOR® PTC Thermistors

Murata POSISTOR^® Positive Temperature Coefficient (PTC) Thermistors are ideal for circuit protection in a variety of applications, such as temperature sensor and temperature compensation. These devices are also suitable for current control in common household appliances, humidifiers, dryers of all kinds, refrigerators, freezers, and air conditioners. In a conventional NTC thermistor, the resistance decreases when the temperature increases, but for the Murata PTC thermistors, the resistance rises sharply when their temperature exceeds a specific temperature.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (SGD) Filter the results in the table by unit price based on your quantity.	Qty.
PTC (Positive Temperature Coefficient) Thermistors 3.3 OHM 20% SMD 0603 PRG18BC3R3MM1RB Murata Electronics 1: $0.53 3,344In Stock NRND	Mfr. Part No. PRG18BC3R3MM1RB Mouser Part No 81-PRG18BC3R3MM1RB NRND	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 3.3 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	3,344In Stock	Cut Tape $0.53 $0.486 $0.404 $0.335 Reel $0.265 View $0.309 $0.276 $0.241 $0.237 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 6.8 OHM 20% SMD 0805 PRG21BC6R8MM1RA Murata Electronics 1: $0.68 18,291In Stock 16,000Expected 30/11/2026	Mfr. Part No. PRG21BC6R8MM1RA Mouser Part No 81-PRG21BC6R8MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 6.8 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	18,291In Stock 16,000Expected 30/11/2026	Cut Tape $0.68 $0.638 $0.594 $0.566 View Reel $0.381 $0.539 $0.486 $0.457 $0.381 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PTC 0402, 10kOhms, 50%, 32VDC PRF15BB103RB6RC Murata Electronics 1: $0.204 19,665In Stock	Mfr. Part No. PRF15BB103RB6RC Mouser Part No 81-PRF15BB103RB6RC	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors PTC 0402, 10kOhms, 50%, 32VDC Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	19,665In Stock	Cut Tape $0.204 $0.184 $0.174 $0.156 Reel $0.103 View $0.139 $0.133 $0.121 $0.088 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC (Positive Temperature Coefficient) Thermistors PRF15BC102RB6RC Murata Electronics 1: $0.245 2,267In Stock 10,000Expected 24/11/2026	Mfr. Part No. PRF15BC102RB6RC Mouser Part No 81-PRF15BC102RB6RC	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	2,267In Stock 10,000Expected 24/11/2026	Cut Tape $0.245 $0.216 $0.19 $0.165 Reel $0.097 View $0.144 $0.137 $0.122 $0.095 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC (Positive Temperature Coefficient) Thermistors 1 OHM 50% SMD 0402 PRF15BD102RB6RC Murata Electronics 1: $0.204 9,576In Stock	Mfr. Part No. PRF15BD102RB6RC Mouser Part No 81-PRF15BD102RB6RC	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 1 OHM 50% SMD 0402 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	9,576In Stock	Cut Tape $0.204 $0.184 $0.16 $0.147 Reel $0.097 View $0.125 $0.12 $0.107 $0.094 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18AR471QB5RB Murata Electronics 1: $0.286 16,127In Stock	Mfr. Part No. PRF18AR471QB5RB Mouser Part No 81-PRF18AR471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	16,127In Stock	Cut Tape $0.286 $0.26 $0.228 $0.201 Reel $0.152 View $0.174 $0.156 $0.136 MouseReel Available	Min.: 1 Mult.: 1 Max.: 12,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRF18AS471QB5RB Murata Electronics 1: $0.272 2,675In Stock	Mfr. Part No. PRF18AS471QB5RB Mouser Part No 81-PRF18AS471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	2,675In Stock	Cut Tape $0.272 $0.246 $0.216 $0.204 Reel $0.147 View $0.18 $0.156 $0.141 $0.139 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BC471QB5RB Murata Electronics 1: $0.272 5,415In Stock	Mfr. Part No. PRF18BC471QB5RB Mouser Part No 81-PRF18BC471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	5,415In Stock	Cut Tape $0.272 $0.246 $0.216 $0.204 Reel $0.144 View $0.18 $0.156 $0.136 $0.132 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BC471RB5RB Murata Electronics 1: $0.558 3,481In Stock	Mfr. Part No. PRF18BC471RB5RB Mouser Part No 81-PRF18BC471RB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	3,481In Stock	Cut Tape $0.558 $0.518 $0.458 $0.437 Reel $0.326 View $0.392 $0.34 $0.303 $0.302 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BD471QB5RB Murata Electronics 1: $0.272 6,372In Stock 16,000Expected 26/11/2026	Mfr. Part No. PRF18BD471QB5RB Mouser Part No 81-PRF18BD471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	6,372In Stock 16,000Expected 26/11/2026	Cut Tape $0.272 $0.246 $0.216 $0.204 View Reel $0.148 $0.18 $0.156 $0.148 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BE471QB5RB Murata Electronics 1: $0.231 17,120In Stock	Mfr. Part No. PRF18BE471QB5RB Mouser Part No 81-PRF18BE471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	17,120In Stock	Cut Tape $0.231 $0.209 $0.184 $0.174 Reel $0.126 View $0.152 $0.132 $0.12 $0.113 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BF471QB5RB Murata Electronics 1: $0.231 6,073In Stock 16,000Expected 7/1/2027	Mfr. Part No. PRF18BF471QB5RB Mouser Part No 81-PRF18BF471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	6,073In Stock 16,000Expected 7/1/2027	Cut Tape $0.231 $0.209 $0.184 $0.174 View Reel $0.126 $0.152 $0.132 $0.126 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRF18BF471RB5RB Murata Electronics 1: $0.558 3,042In Stock	Mfr. Part No. PRF18BF471RB5RB Mouser Part No 81-PRF18BF471RB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	3,042In Stock	Cut Tape $0.558 $0.518 $0.458 $0.437 View Reel $0.314 $0.392 $0.34 $0.314 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 PRF21BA471QB5RA Murata Electronics 1: $0.476 1,271In Stock 4,000Expected 15/12/2026	Mfr. Part No. PRF21BA471QB5RA Mouser Part No 81-PRF21BA471QB5RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	1,271In Stock 4,000Expected 15/12/2026	Cut Tape $0.476 $0.447 $0.394 $0.375 Reel $0.29 View $0.335 $0.309 $0.279 $0.261 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 PRF21BB471QB5RA Murata Electronics 1: $0.476 1,430In Stock	Mfr. Part No. PRF21BB471QB5RA Mouser Part No 81-PRF21BB471QB5RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	1,430In Stock	Cut Tape $0.476 $0.447 $0.394 $0.375 Reel $0.256 View $0.335 $0.321 $0.25 $0.246 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 PRF21BC471QB5RA Murata Electronics 1: $0.626 4,870In Stock	Mfr. Part No. PRF21BC471QB5RA Mouser Part No 81-PRF21BC471QB5RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	4,870In Stock	Cut Tape $0.626 $0.536 $0.462 $0.379 Reel $0.29 View $0.335 $0.291 $0.257 $0.254 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRF21BD471QB5RA Murata Electronics 1: $0.612 318In Stock 4,000Expected 8/1/2027	Mfr. Part No. PRF21BD471QB5RA Mouser Part No 81-PRF21BD471QB5RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	318In Stock 4,000Expected 8/1/2027	Cut Tape $0.612 $0.506 $0.441 $0.389 Reel $0.254 View $0.345 $0.277 $0.245 $0.238 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603 PRG18BB101MS1RB Murata Electronics 1: $0.68 2,638In Stock	Mfr. Part No. PRG18BB101MS1RB Mouser Part No 81-PRG18BB101MS1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	2,638In Stock	Cut Tape $0.68 $0.627 $0.60 $0.521 View Reel $0.332 $0.475 $0.432 $0.398 $0.382 $0.332 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603 PRG18BB330MS1RB Murata Electronics 1: $0.68 1,345In Stock 4,000Expected 4/12/2026	Mfr. Part No. PRG18BB330MS1RB Mouser Part No 81-PRG18BB330MS1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	1,345In Stock 4,000Expected 4/12/2026	Cut Tape $0.68 $0.627 $0.60 $0.521 View Reel $0.302 $0.475 $0.432 $0.398 $0.367 $0.302 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805 PRG21AR220MS1RK Murata Electronics 1: $0.816 2,632In Stock 12,000Expected 11/12/2026	Mfr. Part No. PRG21AR220MS1RK Mouser Part No 81-PRG21AR220MS1RK	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	2,632In Stock 12,000Expected 11/12/2026	Cut Tape $0.816 $0.67 $0.641 $0.558 View Reel $0.332 $0.49 $0.475 $0.412 $0.382 $0.332 MouseReel Available	Min.: 1 Mult.: 1 : 3,000
PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 PRG21AR420MB1RA Murata Electronics 1: $0.762 3,656In Stock 4,000Expected 18/1/2027	Mfr. Part No. PRG21AR420MB1RA Mouser Part No 81-PRG21AR420MB1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	3,656In Stock 4,000Expected 18/1/2027	Cut Tape $0.762 $0.688 $0.635 $0.578 View Reel $0.408 $0.515 $0.484 $0.438 $0.412 $0.408 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 PRG21AR420MS1RA Murata Electronics 1: $0.68 817In Stock	Mfr. Part No. PRG21AR420MS1RA Mouser Part No 81-PRG21AR420MS1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	817In Stock	Cut Tape $0.68 $0.627 $0.60 $0.521 View Reel $0.33 $0.475 $0.432 $0.398 $0.367 $0.33 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 1 OHM 20% SMD 0805 PRG21BC1R0MM1RA Murata Electronics 1: $0.83 4,484In Stock	Mfr. Part No. PRG21BC1R0MM1RA Mouser Part No 81-PRG21BC1R0MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 1 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	4,484In Stock	Cut Tape $0.83 $0.759 $0.713 $0.63 View Reel $0.422 $0.562 $0.522 $0.481 $0.442 $0.422 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 2.2 OHM 20% SMD 0805 PRG21BC2R2MM1RA Murata Electronics 1: $0.816 4,345In Stock 8,000Expected 11/11/2026	Mfr. Part No. PRG21BC2R2MM1RA Mouser Part No 81-PRG21BC2R2MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 2.2 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	4,345In Stock 8,000Expected 11/11/2026	Cut Tape $0.816 $0.744 $0.698 $0.619 View Reel $0.413 $0.571 $0.513 $0.473 $0.437 $0.413 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRG21BC3R3MM1RA Murata Electronics 1: $0.857 2,071In Stock 4,000Expected 22/1/2027	Mfr. Part No. PRG21BC3R3MM1RA Mouser Part No 81-PRG21BC3R3MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	2,071In Stock 4,000Expected 22/1/2027	Cut Tape $0.857 $0.789 $0.763 $0.654 View Reel $0.441 $0.604 $0.543 $0.50 $0.462 $0.441 MouseReel Available	Min.: 1 Mult.: 1 : 4,000

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POSISTOR® PTC Thermistors

Types of Passive Components