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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 Thermistors 15 OHM 20% SMD 0805 PRG21BB150MB1RK Murata Electronics 1: $0.55 9,094In Stock	Mfr. Part # PRG21BB150MB1RK Mouser Part # 81-PRG21BB150MB1RK	Murata Electronics	PTC Thermistors 15 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	9,094In Stock	Cut Tape $0.55 $0.512 $0.432 $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 Thermistors 0.2 OHM 20% SMD 0805 PRG21BC0R2MM1RA Murata Electronics 1: $0.75 8,126In Stock	Mfr. Part # PRG21BC0R2MM1RA Mouser Part # 81-PRG21BC0R2MM1RA	Murata Electronics	PTC Thermistors 0.2 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	8,126In Stock	Cut Tape $0.75 $0.667 $0.57 $0.546 View Reel $0.29 $0.526 $0.473 $0.448 $0.334 $0.29 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors PRF15BA102RB6RC Murata Electronics 1: $0.18 9,809In Stock	Mfr. Part # PRF15BA102RB6RC Mouser Part # 81-PRF15BA102RB6RC	Murata Electronics	PTC 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 Thermistors 22 OHM 20% SMD 0805 PRG21AR220MS1RK Murata Electronics 1: $0.60 2,632In Stock 12,000Expected 12/11/2026	Mfr. Part # PRG21AR220MS1RK Mouser Part # 81-PRG21AR220MS1RK	Murata Electronics	PTC Thermistors 22 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	2,632In Stock 12,000Expected 12/11/2026	Cut Tape $0.60 $0.493 $0.471 $0.41 View Reel $0.244 $0.36 $0.349 $0.303 $0.281 $0.244 MouseReel Available	Min.: 1 Mult.: 1 : 3,000
PTC Thermistors 470 OHM 50% SMD 0805 PRF21BC471QB5RA Murata Electronics 1: $0.46 5,720In Stock	Mfr. Part # PRF21BC471QB5RA Mouser Part # 81-PRF21BC471QB5RA	Murata Electronics	PTC Thermistors 470 OHM 50% SMD 0805 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	5,720In Stock	Cut Tape $0.46 $0.394 $0.34 $0.279 View Reel $0.18 $0.246 $0.203 $0.18 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0805 PRF21BE471QB5RA Murata Electronics 1: $0.38 6,631In Stock	Mfr. Part # PRF21BE471QB5RA Mouser Part # 81-PRF21BE471QB5RA	Murata Electronics	PTC 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 $0.246 $0.207 $0.185 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BG471RB5RB Murata Electronics 1: $0.41 4,032In Stock	Mfr. Part # PRF18BG471RB5RB Mouser Part # 81-PRF18BG471RB5RB	Murata Electronics	PTC Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	4,032In Stock	$0.41 $0.343 $0.316 $0.28 View $0.253 $0.234 $0.22 $0.215 $0.213	Min.: 1 Mult.: 1
PTC Thermistors 0.6 OHM 20% SMD 0805 PRG21BC0R6MM1RA Murata Electronics 1: $0.65 3,820In Stock	Mfr. Part # PRG21BC0R6MM1RA Mouser Part # 81-PRG21BC0R6MM1RA	Murata Electronics	PTC 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 $0.567 $0.498 View Reel $0.336 $0.46 $0.413 $0.381 $0.352 $0.336 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors PRF18BE471RB5RB Murata Electronics 1: $0.41 3,760In Stock	Mfr. Part # PRF18BE471RB5RB Mouser Part # 81-PRF18BE471RB5RB	Murata Electronics	PTC Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	3,760In Stock	Cut Tape $0.41 $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 Thermistors 0603 1kohm 125+/-5degC Curie Point 110degC PRF03BA102QB7RL Murata Electronics 1: $0.13 12,000In Stock New Product	Mfr. Part # PRF03BA102QB7RL Mouser Part # 81-PRF03BA102QB7RL New Product	Murata Electronics	PTC 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 $0.068 $0.061 $0.058 $0.051	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0603 1kohm 125+/-5degC Curie Point 110degC PRF03BA102QS7RL Murata Electronics 1: $0.16 10,400In Stock New Product	Mfr. Part # PRF03BA102QS7RL Mouser Part # 81-PRF03BA102QS7RL New Product	Murata Electronics	PTC 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 $0.061 $0.083 $0.079 $0.071 $0.068 $0.061	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0603 1kohm 95+/-5degC Curie Point 80degC PRF03BD102QB7RL Murata Electronics 1: $0.13 11,920In Stock New Product	Mfr. Part # PRF03BD102QB7RL Mouser Part # 81-PRF03BD102QB7RL New Product	Murata Electronics	PTC 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 $0.068 $0.061 $0.058 $0.051	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0603 1kohm 95+/-5degC Curie Point 80degC PRF03BD102QS7RL Murata Electronics 1: $0.16 11,968In Stock New Product	Mfr. Part # PRF03BD102QS7RL Mouser Part # 81-PRF03BD102QS7RL New Product	Murata Electronics	PTC 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 $0.061 $0.083 $0.079 $0.071 $0.068 $0.061	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0.6x0.3mm 1kohm 115+/-5degC PRF03BB102QB7RL Murata Electronics 1: $0.11 13,539In Stock New Product	Mfr. Part # PRF03BB102QB7RL Mouser Part # 81-PRF03BB102QB7RL New Product	Murata Electronics	PTC 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 $0.082 View Reel $0.053 $0.072 $0.068 $0.061 $0.056 $0.053	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0.6x0.3mm 1kohm 105+/-5degC PRF03BC102QB7RL Murata Electronics 1: $0.11 14,465In Stock New Product	Mfr. Part # PRF03BC102QB7RL Mouser Part # 81-PRF03BC102QB7RL New Product	Murata Electronics	PTC 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 $0.082 View Reel $0.053 $0.072 $0.068 $0.061 $0.056 $0.053	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 33 OHM 20% SMD 0603 PRG18BB330MB1RB Murata Electronics 1: $0.25 144,239In Stock	Mfr. Part # PRG18BB330MB1RB Mouser Part # 81-PRG18BB330MB1RB	Murata Electronics	PTC Thermistors 33 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	144,239In Stock	Cut Tape $0.25 $0.23 $0.191 $0.159 Reel $0.103 View $0.149 $0.112 $0.092 $0.089 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 4.7 OHM 20% SMD 0805 PRG18BC4R7MM1RB Murata Electronics 1: $0.39 10,264In Stock NRND	Mfr. Part # PRG18BC4R7MM1RB Mouser Part # 81-PRG18BC4R7MM1RB NRND	Murata Electronics	PTC Thermistors 4.7 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	10,264In Stock	Cut Tape $0.39 $0.358 $0.298 $0.247 Reel $0.179 View $0.228 $0.195 $0.173 $0.168 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
Aluminum Organic Polymer Capacitors ECASD40E337M006KA0 Murata Electronics 1: $1.86 2,718In Stock	Mfr. Part # ECASD40E337M006KA0 Mouser Part # 81-ECASD40E337M006KA	Murata Electronics	Aluminum 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 Thermistors PRF15BB102RB6RC Murata Electronics 1: $0.15 56,774In Stock	Mfr. Part # PRF15BB102RB6RC Mouser Part # 81-PRF15BB102RB6RC	Murata Electronics	PTC Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	56,774In Stock	Cut Tape $0.15 $0.135 $0.118 $0.108 Reel $0.075 View $0.092 $0.088 $0.079 $0.072 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BA471QB5RB Murata Electronics 1: $0.20 64,029In Stock	Mfr. Part # PRF18BA471QB5RB Mouser Part # 81-PRF18BA471QB5RB	Murata Electronics	PTC 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 Thermistors 470 OHM 50% SMD 0603 PRF18BG471QB5RB Murata Electronics 1: $0.17 22,053In Stock 60,000On Order	Mfr. Part # PRF18BG471QB5RB Mouser Part # 81-PRF18BG471QB5RB	Murata Electronics	PTC Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	22,053In Stock 60,000On Order On Order Ship Dates Mfr. #: PRF18BG471QB5RB Stock: 22,053 Can Ship Immediately On Order: 28,000 Expected 10/23/2026 32,000 Expected 12/31/2026 Factory Lead-Time: 12 Weeks	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 Thermistors 100 OHM 20% SMD 0603 PRG18BB101MB1RB Murata Electronics 1: $0.26 37,301In Stock 32,000Expected 12/3/2026	Mfr. Part # PRG18BB101MB1RB Mouser Part # 81-PRG18BB101MB1RB	Murata Electronics	PTC Thermistors 100 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	37,301In Stock 32,000Expected 12/3/2026	Cut Tape $0.26 $0.234 $0.194 $0.162 Reel $0.104 View $0.152 $0.114 $0.094 $0.09 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 220 OHM 20% SMD 0603 PRG18BB221MB1RB Murata Electronics 1: $0.27 32,080In Stock 96,000On Order	Mfr. Part # PRG18BB221MB1RB Mouser Part # 81-PRG18BB221MB1RB	Murata Electronics	PTC Thermistors 220 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	32,080In Stock 96,000On Order On Order Ship Dates Mfr. #: PRG18BB221MB1RB Stock: 32,080 Can Ship Immediately On Order: 36,000 Expected 12/3/2026 60,000 Expected 12/24/2026 Factory Lead-Time: 12 Weeks	Cut Tape $0.27 $0.244 $0.20 $0.168 Reel $0.102 View $0.152 $0.112 $0.092 $0.088 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 0603 47ohm 20% SMD PRG18BB470MB1RB Murata Electronics 1: $0.37 53,456In Stock 44,000Expected 11/26/2026	Mfr. Part # PRG18BB470MB1RB Mouser Part # 81-PRG18BB470MB1RB	Murata Electronics	PTC Thermistors 0603 47ohm 20% SMD Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	53,456In Stock 44,000Expected 11/26/2026	Cut Tape $0.37 $0.328 $0.275 $0.228 Reel $0.159 View $0.215 $0.188 $0.141 $0.14 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 20% SMD 0603 PRG18BB471MB1RB Murata Electronics 1: $0.25 38,308In Stock 24,000Expected 11/16/2026	Mfr. Part # PRG18BB471MB1RB Mouser Part # 81-PRG18BB471MB1RB	Murata Electronics	PTC Thermistors 470 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	38,308In Stock 24,000Expected 11/16/2026	Cut Tape $0.25 $0.23 $0.191 $0.159 Reel $0.111 View $0.152 $0.131 $0.097 $0.094 MouseReel Available	Min.: 1 Mult.: 1 : 4,000

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