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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 15 OHM 20% SMD 0805 PRG21BB150MB1RK Murata Electronics 1: $0.57 9,094In Stock	Mfr. Part No. PRG21BB150MB1RK Mouser Part No 81-PRG21BB150MB1RK	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 15 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	9,094In Stock	Cut Tape $0.57 $0.52 $0.433 $0.418 View Reel $0.259 $0.395 $0.358 $0.34 $0.319 $0.259 MouseReel Available	Min.: 1 Mult.: 1 : 3,000
PTC (Positive Temperature Coefficient) Thermistors 0.2 OHM 20% SMD 0805 PRG21BC0R2MM1RA Murata Electronics 1: $0.75 8,124In Stock	Mfr. Part No. PRG21BC0R2MM1RA Mouser Part No 81-PRG21BC0R2MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0.2 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	8,124In Stock	Cut Tape $0.75 $0.686 $0.57 $0.547 View Reel $0.313 $0.526 $0.473 $0.448 $0.355 $0.313 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRF15BA102RB6RC Murata Electronics 1: $0.18 9,809In Stock	Mfr. Part No. PRF15BA102RB6RC Mouser Part No 81-PRF15BA102RB6RC	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	9,809In Stock	Cut Tape $0.18 $0.149 $0.131 $0.105 View Reel $0.066 $0.092 $0.088 $0.079 $0.066 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
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 $0.244 $0.361 $0.349 $0.304 $0.281 $0.244 MouseReel Available	Min.: 1 Mult.: 1 : 3,000
PTC (Positive Temperature Coefficient) Thermistors PRF18BE471RB5RB Murata Electronics 1: $0.411 3,760In Stock	Mfr. Part No. PRF18BE471RB5RB Mouser Part No 81-PRF18BE471RB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	3,760In Stock	Cut Tape $0.411 $0.381 $0.337 $0.321 Reel $0.23 View $0.288 $0.241 $0.219 $0.216 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 PRF21BC471QB5RA Murata Electronics 1: $0.461 5,720In 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	5,720In Stock	Cut Tape $0.461 $0.394 $0.34 $0.279 View Reel $0.18 $0.247 $0.204 $0.18 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 PRF21BE471QB5RA Murata Electronics 1: $0.38 6,631In Stock	Mfr. Part No. PRF21BE471QB5RA Mouser Part No 81-PRF21BE471QB5RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	6,631In Stock	Cut Tape $0.38 $0.356 $0.315 $0.279 View Reel $0.185 $0.247 $0.207 $0.185 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 3,820In 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	3,820In Stock	Cut Tape $0.65 $0.60 $0.568 $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 470 OHM 50% SMD 0603 PRF18BG471RB5RB Murata Electronics 1: $0.411 4,032In Stock	Mfr. Part No. PRF18BG471RB5RB Mouser Part No 81-PRF18BG471RB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	4,032In Stock	$0.411 $0.343 $0.316 $0.28 View $0.254 $0.234 $0.22 $0.215 $0.213	Min.: 1 Mult.: 1
PTC (Positive Temperature Coefficient) Thermistors 0603 1kohm 125+/-5degC Curie Point 110degC PRF03BA102QB7RL Murata Electronics 1: $0.13 12,000In Stock New Product	Mfr. Part No. PRF03BA102QB7RL Mouser Part No 81-PRF03BA102QB7RL New Product	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0603 1kohm 125+/-5degC Curie Point 110degC Learn More about Murata Electronics murata auto prf ptc thermistors	Datasheet	12,000In Stock	Cut Tape $0.13 $0.11 $0.097 $0.081 View Reel $0.051 $0.071 $0.067 $0.06 $0.058 $0.051	Min.: 1 Mult.: 1 : 15,000
PTC (Positive Temperature Coefficient) Thermistors 0603 1kohm 125+/-5degC Curie Point 110degC PRF03BA102QS7RL Murata Electronics 1: $0.16 10,400In Stock New Product	Mfr. Part No. PRF03BA102QS7RL Mouser Part No 81-PRF03BA102QS7RL New Product	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0603 1kohm 125+/-5degC Curie Point 110degC Learn More about Murata Electronics murata auto prf ptc thermistors	Datasheet	10,400In Stock	Cut Tape $0.16 $0.133 $0.117 $0.094 View Reel $0.06 $0.083 $0.079 $0.071 $0.067 $0.06	Min.: 1 Mult.: 1 : 15,000
PTC (Positive Temperature Coefficient) Thermistors 0603 1kohm 95+/-5degC Curie Point 80degC PRF03BD102QB7RL Murata Electronics 1: $0.13 11,920In Stock New Product	Mfr. Part No. PRF03BD102QB7RL Mouser Part No 81-PRF03BD102QB7RL New Product	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0603 1kohm 95+/-5degC Curie Point 80degC Learn More about Murata Electronics murata auto prf ptc thermistors	Datasheet	11,920In Stock	Cut Tape $0.13 $0.11 $0.097 $0.081 View Reel $0.051 $0.071 $0.067 $0.06 $0.058 $0.051	Min.: 1 Mult.: 1 : 15,000
PTC (Positive Temperature Coefficient) Thermistors 0603 1kohm 95+/-5degC Curie Point 80degC PRF03BD102QS7RL Murata Electronics 1: $0.16 11,968In Stock New Product	Mfr. Part No. PRF03BD102QS7RL Mouser Part No 81-PRF03BD102QS7RL New Product	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0603 1kohm 95+/-5degC Curie Point 80degC Learn More about Murata Electronics murata auto prf ptc thermistors	Datasheet	11,968In Stock	Cut Tape $0.16 $0.133 $0.117 $0.094 View Reel $0.06 $0.083 $0.079 $0.071 $0.067 $0.06	Min.: 1 Mult.: 1 : 15,000
PTC (Positive Temperature Coefficient) Thermistors 0.6x0.3mm 1kohm 115+/-5degC PRF03BB102QB7RL Murata Electronics 1: $0.11 13,539In Stock New Product	Mfr. Part No. PRF03BB102QB7RL Mouser Part No 81-PRF03BB102QB7RL New Product	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0.6x0.3mm 1kohm 115+/-5degC Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	13,539In Stock	Cut Tape $0.11 $0.099 $0.086 $0.083 View Reel $0.053 $0.072 $0.067 $0.06 $0.056 $0.053	Min.: 1 Mult.: 1 : 15,000
PTC (Positive Temperature Coefficient) Thermistors 0.6x0.3mm 1kohm 105+/-5degC PRF03BC102QB7RL Murata Electronics 1: $0.11 14,465In Stock New Product	Mfr. Part No. PRF03BC102QB7RL Mouser Part No 81-PRF03BC102QB7RL New Product	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0.6x0.3mm 1kohm 105+/-5degC Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	14,465In Stock	Cut Tape $0.11 $0.099 $0.086 $0.083 View Reel $0.053 $0.072 $0.067 $0.06 $0.056 $0.053	Min.: 1 Mult.: 1 : 15,000
PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603 PRG18BB330MB1RB Murata Electronics 1: $0.25 142,959In Stock	Mfr. Part No. PRG18BB330MB1RB Mouser Part No 81-PRG18BB330MB1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	142,959In Stock	Cut Tape $0.25 $0.23 $0.191 $0.159 Reel $0.102 View $0.151 $0.112 $0.092 $0.091 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
Aluminium Organic Polymer Capacitors ECASD40E337M006KA0 Murata Electronics 1: $1.86 2,718In Stock	Mfr. Part No. ECASD40E337M006KA0 Mouser Part No 81-ECASD40E337M006KA	Murata Electronics	Aluminium Organic Polymer Capacitors Learn More about Murata Electronics murataecaspolymer	Datasheet	2,718In Stock	Cut Tape $1.86 $1.26 $1.01 $0.909 Reel $0.659 View $0.713 $0.628 MouseReel Available	Min.: 1 Mult.: 1 Max.: 9,000 : 3,000
PTC (Positive Temperature Coefficient) Thermistors PRF15BB102RB6RC Murata Electronics 1: $0.15 56,774In Stock	Mfr. Part No. PRF15BB102RB6RC Mouser Part No 81-PRF15BB102RB6RC	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	56,774In Stock	Cut Tape $0.15 $0.135 $0.117 $0.108 Reel $0.076 View $0.092 $0.088 $0.079 $0.072 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BA471QB5RB Murata Electronics 1: $0.20 64,029In Stock	Mfr. Part No. PRF18BA471QB5RB Mouser Part No 81-PRF18BA471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	64,029In Stock	Cut Tape $0.20 $0.181 $0.17 $0.158 View Reel $0.113 $0.138 $0.124 $0.113 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BG471QB5RB Murata Electronics 1: $0.17 50,053In Stock 32,000Expected 2026/12/31	Mfr. Part No. PRF18BG471QB5RB Mouser Part No 81-PRF18BG471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	50,053In Stock 32,000Expected 2026/12/31	Cut Tape $0.17 $0.154 $0.135 $0.128 Reel $0.093 View $0.112 $0.097 $0.088 $0.086 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603 PRG18BB101MB1RB Murata Electronics 1: $0.261 37,161In Stock 32,000Expected 2026/12/03	Mfr. Part No. PRG18BB101MB1RB Mouser Part No 81-PRG18BB101MB1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	37,161In Stock 32,000Expected 2026/12/03	Cut Tape $0.261 $0.234 $0.194 $0.162 Reel $0.105 View $0.152 $0.114 $0.094 $0.092 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 220 OHM 20% SMD 0603 PRG18BB221MB1RB Murata Electronics 1: $0.28 26,529In Stock 96,000On Order	Mfr. Part No. PRG18BB221MB1RB Mouser Part No 81-PRG18BB221MB1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 220 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	26,529In Stock 96,000On Order On Order Ship Dates Mfr. No: PRG18BB221MB1RB Stock: 26,529 Can Dispatch Immediately On Order: 36,000 Expected 2026/12/03 60,000 Expected 2026/12/24 Factory Lead Time: 12 Weeks	Cut Tape $0.28 $0.247 $0.199 $0.184 Reel $0.123 View $0.152 $0.134 $0.11 $0.105 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 0603 47ohm 20% SMD PRG18BB470MB1RB Murata Electronics 1: $0.37 53,406In Stock 44,000Expected 2026/11/26	Mfr. Part No. PRG18BB470MB1RB Mouser Part No 81-PRG18BB470MB1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0603 47ohm 20% SMD Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	53,406In Stock 44,000Expected 2026/11/26	Cut Tape $0.37 $0.328 $0.276 $0.228 Reel $0.159 View $0.215 $0.188 $0.145 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 20% SMD 0603 PRG18BB471MB1RB Murata Electronics 1: $0.25 37,698In Stock 24,000Expected 2026/11/20	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	37,698In Stock 24,000Expected 2026/11/20	Cut Tape $0.25 $0.23 $0.191 $0.159 Reel $0.108 View $0.152 $0.119 $0.097 $0.093 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805 PRG21BB220MB1RK Murata Electronics 1: $0.561 6,000In Stock 15,000On Order	Mfr. Part No. PRG21BB220MB1RK Mouser Part No 81-PRG21BB220MB1RK	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	6,000In Stock 15,000On Order On Order Ship Dates Mfr. No: PRG21BB220MB1RK Stock: 6,000 Can Dispatch Immediately On Order: 6,000 Expected 2026/12/08 9,000 Expected 2026/12/11 Factory Lead Time: 12 Weeks	Cut Tape $0.561 $0.518 $0.495 $0.429 View Reel $0.258 $0.395 $0.356 $0.328 $0.304 $0.258 MouseReel Available	Min.: 1 Mult.: 1 : 3,000

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