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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: $0.741 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 $0.741 $0.676 $0.562 $0.543 View Reel $0.337 $0.514 $0.465 $0.442 $0.415 $0.337 MouseReel Available	Min.: 1 Mult.: 1 : 3,000
PTC Thermistors 0.2 OHM 20% SMD 0805 PRG21BC0R2MM1RA Murata Electronics 1: $0.975 8,124In 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	8,124In Stock	Cut Tape $0.975 $0.892 $0.741 $0.71 View Reel $0.407 $0.684 $0.615 $0.582 $0.462 $0.407 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors PRF15BA102RB6RC Murata Electronics 1: $0.234 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 $0.234 $0.194 $0.17 $0.137 View Reel $0.086 $0.12 $0.114 $0.103 $0.086 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC Thermistors 0.6 OHM 20% SMD 0805 PRG21BC0R6MM1RA Murata Electronics 1: $0.845 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 $0.845 $0.78 $0.737 $0.647 View Reel $0.437 $0.598 $0.537 $0.495 $0.458 $0.437 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors PRF18BE471RB5RB Murata Electronics 1: $0.533 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 $0.533 $0.495 $0.438 $0.417 Reel $0.299 View $0.374 $0.313 $0.285 $0.281 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0805 PRF21BC471QB5RA Murata Electronics 1: $0.598 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 $0.598 $0.512 $0.442 $0.363 Reel $0.243 View $0.32 $0.264 $0.242 $0.239 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0805 PRF21BE471QB5RA Murata Electronics 1: $0.494 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 $0.494 $0.463 $0.41 $0.363 View Reel $0.241 $0.32 $0.269 $0.241 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BG471RB5RB Murata Electronics 1: $0.533 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	$0.533 $0.488 $0.438 $0.381 View $0.341 $0.313 $0.312 $0.285 $0.28	Min.: 1 Mult.: 1
PTC Thermistors 0603 1kohm 125+/-5degC Curie Point 110degC PRF03BA102QB7RL Murata Electronics 1: $0.169 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 $0.169 $0.143 $0.126 $0.105 View Reel $0.066 $0.092 $0.088 $0.079 $0.075 $0.066	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0603 1kohm 125+/-5degC Curie Point 110degC PRF03BA102QS7RL Murata Electronics 1: $0.208 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 $0.208 $0.173 $0.152 $0.122 View Reel $0.079 $0.108 $0.103 $0.092 $0.088 $0.079	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0603 1kohm 95+/-5degC Curie Point 80degC PRF03BD102QB7RL Murata Electronics 1: $0.169 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 $0.169 $0.143 $0.126 $0.105 View Reel $0.066 $0.092 $0.088 $0.079 $0.075 $0.066	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0603 1kohm 95+/-5degC Curie Point 80degC PRF03BD102QS7RL Murata Electronics 1: $0.208 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 $0.208 $0.173 $0.152 $0.122 View Reel $0.079 $0.108 $0.103 $0.092 $0.088 $0.079	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0.6x0.3mm 1kohm 115+/-5degC PRF03BB102QB7RL Murata Electronics 1: $0.143 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 $0.143 $0.129 $0.112 $0.107 View Reel $0.069 $0.094 $0.088 $0.079 $0.073 $0.069	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0.6x0.3mm 1kohm 105+/-5degC PRF03BC102QB7RL Murata Electronics 1: $0.143 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 $0.143 $0.129 $0.112 $0.107 View Reel $0.069 $0.094 $0.088 $0.079 $0.073 $0.069	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 33 OHM 20% SMD 0603 PRG18BB330MB1RB Murata Electronics 1: $0.325 142,834In 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	142,834In Stock	Cut Tape $0.325 $0.299 $0.248 $0.207 Reel $0.133 View $0.196 $0.146 $0.12 $0.116 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors PRF15BB102RB6RC Murata Electronics 1: $0.195 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 $0.195 $0.176 $0.153 $0.14 Reel $0.098 View $0.12 $0.114 $0.103 $0.094 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BA471QB5RB Murata Electronics 1: $0.26 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 $0.26 $0.235 $0.221 $0.205 View Reel $0.147 $0.179 $0.161 $0.147 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BG471QB5RB Murata Electronics 1: $0.221 50,053In Stock 32,000Expected 12/31/2026	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	50,053In Stock 32,000Expected 12/31/2026	Cut Tape $0.221 $0.20 $0.176 $0.166 Reel $0.121 View $0.146 $0.126 $0.114 $0.112 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 100 OHM 20% SMD 0603 PRG18BB101MB1RB Murata Electronics 1: $0.338 37,161In 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	37,161In Stock 32,000Expected 12/3/2026	Cut Tape $0.338 $0.304 $0.252 $0.211 Reel $0.135 View $0.198 $0.148 $0.122 $0.117 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 220 OHM 20% SMD 0603 PRG18BB221MB1RB Murata Electronics 1: $0.364 26,229In 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	26,229In Stock 96,000On Order On Order Ship Dates Mfr. #: PRG18BB221MB1RB Stock: 26,229 Can Ship Immediately On Order: 36,000 Expected 12/3/2026 60,000 Expected 12/24/2026 Factory Lead-Time: 12 Weeks	Cut Tape $0.364 $0.32 $0.259 $0.239 Reel $0.16 View $0.198 $0.174 $0.143 $0.137 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 0603 47ohm 20% SMD PRG18BB470MB1RB Murata Electronics 1: $0.481 53,406In 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	53,406In Stock 44,000Expected 11/26/2026	Cut Tape $0.481 $0.426 $0.358 $0.296 Reel $0.207 View $0.28 $0.244 $0.183 $0.182 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 20% SMD 0603 PRG18BB471MB1RB Murata Electronics 1: $0.325 37,698In Stock 24,000Expected 11/20/2026	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	37,698In Stock 24,000Expected 11/20/2026	Cut Tape $0.325 $0.299 $0.248 $0.207 Reel $0.14 View $0.198 $0.155 $0.126 $0.121 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 22 OHM 20% SMD 0805 PRG21BB220MB1RK Murata Electronics 1: $0.728 6,000In Stock 15,000On Order	Mfr. Part # PRG21BB220MB1RK Mouser Part # 81-PRG21BB220MB1RK	Murata Electronics	PTC 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. #: PRG21BB220MB1RK Stock: 6,000 Can Ship Immediately On Order: 6,000 Expected 12/8/2026 9,000 Expected 12/11/2026 Factory Lead-Time: 12 Weeks	Cut Tape $0.728 $0.672 $0.644 $0.558 View Reel $0.335 $0.514 $0.463 $0.426 $0.394 $0.335 MouseReel Available	Min.: 1 Mult.: 1 : 3,000
PTC Thermistors 4.7 OHM 20% SMD 0805 PRG21BC4R7MM1RA Murata Electronics 1: $0.65 8,226In Stock	Mfr. Part # PRG21BC4R7MM1RA Mouser Part # 81-PRG21BC4R7MM1RA	Murata Electronics	PTC Thermistors 4.7 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	8,226In Stock	Cut Tape $0.65 $0.611 $0.569 $0.542 View Reel $0.394 $0.516 $0.465 $0.438 $0.394 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 2.2 OHM 20% SMD 0603 PRG18BC2R2MM1RB Murata Electronics 1: $0.533 Non-Stocked Lead-Time 12 Weeks NRND	Mfr. Part # PRG18BC2R2MM1RB Mouser Part # 81-PRG18BC2R2MM1RB NRND	Murata Electronics	PTC Thermistors 2.2 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	Non-Stocked Lead-Time 12 Weeks	Cut Tape $0.533 $0.485 $0.38 $0.339 Reel $0.218 View $0.308 $0.239 $0.196 $0.195 MouseReel Available	Min.: 1 Mult.: 1 : 4,000

POSISTOR® PTC Thermistors

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