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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 (USD) Filter the results in the table by unit price based on your quantity.	Qty.
PTC (Positive Temperature Coefficient) Thermistors 6.8 OHM 20% SMD 0805 PRG21BC6R8MM1RA Murata Electronics 1: $0.50 18,755In Stock 16,000Expected 2026/11/23	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	18,755In Stock 16,000Expected 2026/11/23	Cut Tape $0.50 $0.469 $0.437 $0.416 View Reel $0.28 $0.397 $0.357 $0.336 $0.28 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 1 OHM 20% SMD 0603 PRG18BC1R0MM1RB Murata Electronics 1: $0.40 1,790In Stock NRND	Mfr. Part No. PRG18BC1R0MM1RB Mouser Part No 81-PRG18BC1R0MM1RB NRND	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 1 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	1,790In Stock	Cut Tape $0.40 $0.361 $0.30 $0.249 Reel $0.197 View $0.23 $0.206 $0.188 $0.177 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 6.8 OHM 20% SMD 0603 PRG18BC6R8MM1RB Murata Electronics 1: $0.411 12,000In Stock NRND	Mfr. Part No. PRG18BC6R8MM1RB Mouser Part No 81-PRG18BC6R8MM1RB NRND	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 6.8 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	12,000In Stock	Cut Tape $0.411 $0.344 $0.314 $0.261 Reel $0.167 View $0.236 $0.183 $0.151 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRF15BC102RB6RC Murata Electronics 1: $0.18 2,269In Stock 10,000Expected 2026/11/12	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	2,269In Stock 10,000Expected 2026/11/12	Cut Tape $0.18 $0.159 $0.14 $0.121 Reel $0.071 View $0.106 $0.101 $0.09 $0.07 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC (Positive Temperature Coefficient) Thermistors PRF18AS471QB5RB Murata Electronics 1: $0.20 2,680In 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	2,680In Stock	Cut Tape $0.20 $0.181 $0.159 $0.15 Reel $0.108 View $0.133 $0.115 $0.104 $0.102 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BC471RB5RB Murata Electronics 1: $0.411 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 $0.411 $0.381 $0.337 $0.321 Reel $0.24 View $0.288 $0.25 $0.223 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BE471QB5RB Murata Electronics 1: $0.17 17,230In 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	17,230In Stock	Cut Tape $0.17 $0.154 $0.135 $0.128 View Reel $0.085 $0.11 $0.091 $0.085 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BF471QB5RB Murata Electronics 1: $0.20 4,383In Stock 4,000Expected 2026/10/29	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	4,383In Stock 4,000Expected 2026/10/29	Cut Tape $0.20 $0.186 $0.164 $0.133 View Reel $0.088 $0.117 $0.106 $0.088 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRF18BF471RB5RB Murata Electronics 1: $0.411 3,192In 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	3,192In Stock	Cut Tape $0.411 $0.381 $0.337 $0.321 View Reel $0.231 $0.288 $0.25 $0.231 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: $0.35 1,271In Stock 4,000Expected 2026/12/15	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 2026/12/15	Cut Tape $0.35 $0.329 $0.29 $0.276 Reel $0.193 View $0.247 $0.206 $0.192 $0.183 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRF21BD471QB5RA Murata Electronics 1: $0.45 318In Stock	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	Cut Tape $0.45 $0.402 $0.351 $0.311 Reel $0.20 View $0.276 $0.214 $0.193 $0.19 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603 PRG18BB101MS1RB Murata Electronics 1: $0.50 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 $0.50 $0.461 $0.441 $0.383 View Reel $0.242 $0.349 $0.317 $0.293 $0.281 $0.242 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603 PRG18BB330MS1RB Murata Electronics 1: $0.50 1,345In Stock 4,000Expected 2026/12/04	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 2026/12/04	Cut Tape $0.50 $0.461 $0.437 $0.383 View Reel $0.256 $0.349 $0.317 $0.293 $0.27 $0.256 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 20% SMD 0603 PRG18BB471MB1RB Murata Electronics 1: $0.25 11,868In Stock 52,000On Order	Mfr. Part No. PRG18BB471MB1RB Mouser Part No 81-PRG18BB471MB1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	11,868In Stock 52,000On Order On Order Ship Dates Mfr. No: PRG18BB471MB1RB Stock: 11,868 Can Dispatch Immediately On Order: 28,000 Expected 2026/10/01 24,000 Expected 2026/11/16 Factory Lead Time: 12 Weeks	Cut Tape $0.25 $0.23 $0.191 $0.159 Reel $0.108 View $0.152 $0.119 $0.098 $0.094 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805 PRG21AR220MS1RK Murata Electronics 1: $0.60 2,632In Stock 12,000Expected 2026/12/11	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 2026/12/11	Cut Tape $0.60 $0.493 $0.471 $0.411 View Reel $0.272 $0.361 $0.349 $0.304 $0.281 $0.272 MouseReel Available	Min.: 1 Mult.: 1 : 3,000
PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 PRG21AR420MS1RA Murata Electronics 1: $0.50 1,142In 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	1,142In Stock	Cut Tape $0.50 $0.461 $0.441 $0.383 View Reel $0.243 $0.349 $0.317 $0.293 $0.27 $0.243 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 0.6 OHM 20% SMD 0805 PRG21BC0R6MM1RA Murata Electronics 1: $0.65 3,870In Stock	Mfr. Part No. PRG21BC0R6MM1RA Mouser Part No 81-PRG21BC0R6MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0.6 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	3,870In Stock	Cut Tape $0.65 $0.60 $0.583 $0.498 View Reel $0.336 $0.461 $0.413 $0.381 $0.352 $0.336 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 2.2 OHM 20% SMD 0805 PRG21BC2R2MM1RA Murata Electronics 1: $0.60 4,908In Stock 8,000Expected 2026/11/05	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	4,908In Stock 8,000Expected 2026/11/05	Cut Tape $0.60 $0.547 $0.513 $0.455 View Reel $0.304 $0.42 $0.377 $0.348 $0.321 $0.304 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRG21BC3R3MM1RA Murata Electronics 1: $0.63 4,438In Stock	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	4,438In Stock	Cut Tape $0.63 $0.58 $0.561 $0.481 View Reel $0.324 $0.444 $0.399 $0.368 $0.34 $0.324 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PTC 0402, 10kOhms, 50%, 32VDC PRF15BB103RB6RC Murata Electronics 1: $0.15 19,975In 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	19,975In Stock	Cut Tape $0.15 $0.135 $0.127 $0.115 Reel $0.076 View $0.102 $0.098 $0.09 $0.065 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC (Positive Temperature Coefficient) Thermistors 1 OHM 50% SMD 0402 PRF15BD102RB6RC Murata Electronics 1: $0.15 9,650In 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	9,650In Stock	Cut Tape $0.15 $0.135 $0.117 $0.108 Reel $0.071 View $0.092 $0.088 $0.079 $0.069 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18AR471QB5RB Murata Electronics 1: $0.22 132In Stock 16,000On Order	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	132In Stock 16,000On Order On Order Ship Dates Mfr. No: PRF18AR471QB5RB Stock: 132 Can Dispatch Immediately On Order: 8,000 Expected 2026/10/12 8,000 Expected 2026/10/22 Factory Lead Time: 13 Weeks	Cut Tape $0.22 $0.192 $0.172 $0.143 Reel $0.104 View $0.12 $0.115 $0.10 MouseReel Available	Min.: 1 Mult.: 1 Max.: 12,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BB471QB5RB Murata Electronics 1: $0.361 58In Stock 4,000Expected 2026/11/18	Mfr. Part No. PRF18BB471QB5RB Mouser Part No 81-PRF18BB471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	58In Stock 4,000Expected 2026/11/18	Cut Tape $0.361 $0.335 $0.297 $0.273 Reel $0.19 View $0.242 $0.211 $0.183 $0.18 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BC471QB5RB Murata Electronics 1: $0.20 1,525In Stock 4,000Expected 2026/10/01	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	1,525In Stock 4,000Expected 2026/10/01	Cut Tape $0.20 $0.181 $0.159 $0.15 Reel $0.106 View $0.133 $0.115 $0.10 $0.097 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BD471QB5RB Murata Electronics 1: $0.20 6,963In Stock 16,000Expected 2026/11/26	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	6,963In Stock 16,000Expected 2026/11/26	Cut Tape $0.20 $0.181 $0.159 $0.15 View Reel $0.109 $0.133 $0.115 $0.109 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000

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