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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 (PEN) 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: S/2.10 10,074In 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	10,074In Stock	Cut Tape S/2.10 S/1.96 S/1.68 S/1.63 View Reel S/1.01 S/1.54 S/1.39 S/1.32 S/1.25 S/1.01 MouseReel Available	Min.: 1 Mult.: 1 : 3,000
PTC Thermistors 0.2 OHM 20% SMD 0805 PRG21BC0R2MM1RA Murata Electronics 1: S/2.92 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 S/2.92 S/2.67 S/2.22 S/2.13 View Reel S/1.29 S/2.05 S/1.84 S/1.74 S/1.64 S/1.29 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0805 PRF21BC471QB5RA Murata Electronics 1: S/1.79 6,070In 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	6,070In Stock	Cut Tape S/1.79 S/1.53 S/1.32 S/1.09 Reel S/0.681 View S/0.958 S/0.79 S/0.677 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0805 PRF21BE471QB5RA Murata Electronics 1: S/1.48 6,670In 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	6,670In Stock	Cut Tape S/1.48 S/1.39 S/1.23 S/1.09 Reel S/0.705 View S/0.958 S/0.806 S/0.697 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors PRF15BA102RB6RC Murata Electronics 1: S/0.701 9,889In Stock	Mfr. Part # PRF15BA102RB6RC Mouser Part # 81-PRF15BA102RB6RC	Murata Electronics	PTC Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	9,889In Stock	Cut Tape S/0.701 S/0.58 S/0.51 S/0.409 View Reel S/0.253 S/0.358 S/0.343 S/0.308 S/0.253 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC Thermistors PRF18BE471RB5RB Murata Electronics 1: S/1.60 3,860In Stock	Mfr. Part # PRF18BE471RB5RB Mouser Part # 81-PRF18BE471RB5RB	Murata Electronics	PTC Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	3,860In Stock	Cut Tape S/1.60 S/1.48 S/1.31 S/1.25 Reel S/0.903 View S/1.12 S/0.938 S/0.852 S/0.841 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BG471RB5RB Murata Electronics 1: S/1.60 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	S/1.60 S/1.34 S/1.23 S/1.12 View S/1.02 S/0.923 S/0.876	Min.: 1 Mult.: 1
PTC Thermistors 0603 1kohm 125+/-5degC Curie Point 110degC PRF03BA102QB7RL Murata Electronics 1: S/0.506 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 S/0.506 S/0.428 S/0.378 S/0.315 View Reel S/0.199 S/0.276 S/0.265 S/0.237 S/0.226 S/0.199	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0603 1kohm 125+/-5degC Curie Point 110degC PRF03BA102QS7RL Murata Electronics 1: S/0.623 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 S/0.623 S/0.518 S/0.455 S/0.366 View Reel S/0.237 S/0.323 S/0.308 S/0.276 S/0.265 S/0.237	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0603 1kohm 95+/-5degC Curie Point 80degC PRF03BD102QB7RL Murata Electronics 1: S/0.506 12,000In 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	12,000In Stock	Cut Tape S/0.506 S/0.428 S/0.378 S/0.315 View Reel S/0.199 S/0.276 S/0.265 S/0.237 S/0.226 S/0.199	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0603 1kohm 95+/-5degC Curie Point 80degC PRF03BD102QS7RL Murata Electronics 1: S/0.623 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 S/0.623 S/0.518 S/0.455 S/0.366 View Reel S/0.237 S/0.323 S/0.308 S/0.276 S/0.265 S/0.237	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0.6x0.3mm 1kohm 115+/-5degC PRF03BB102QB7RL Murata Electronics 1: S/0.428 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 S/0.428 S/0.385 S/0.335 S/0.319 View Reel S/0.206 S/0.28 S/0.265 S/0.237 S/0.218 S/0.206	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 0.6x0.3mm 1kohm 105+/-5degC PRF03BC102QB7RL Murata Electronics 1: S/0.428 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 S/0.428 S/0.385 S/0.335 S/0.319 View Reel S/0.206 S/0.28 S/0.265 S/0.237 S/0.218 S/0.206	Min.: 1 Mult.: 1 : 15,000
PTC Thermistors 33 OHM 20% SMD 0603 PRG18BB330MB1RB Murata Electronics 1: S/0.973 145,354In 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	145,354In Stock	Cut Tape S/0.973 S/0.895 S/0.743 S/0.619 Reel S/0.401 View S/0.58 S/0.436 S/0.358 S/0.346 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 4.7 OHM 20% SMD 0805 PRG18BC4R7MM1RB Murata Electronics 1: S/1.52 10,689In 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	10,689In Stock	Cut Tape S/1.52 S/1.39 S/1.16 S/0.961 Reel S/0.697 View S/0.887 S/0.759 S/0.673 S/0.654 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors PRF15BB102RB6RC Murata Electronics 1: S/0.584 56,825In Stock	Mfr. Part # PRF15BB102RB6RC Mouser Part # 81-PRF15BB102RB6RC	Murata Electronics	PTC Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	56,825In Stock	Cut Tape S/0.584 S/0.525 S/0.459 S/0.42 Reel S/0.292 View S/0.358 S/0.343 S/0.308 S/0.28 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BA471QB5RB Murata Electronics 1: S/0.779 64,034In 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	64,034In Stock	Cut Tape S/0.779 S/0.705 S/0.662 S/0.615 View Reel S/0.44 S/0.537 S/0.483 S/0.44 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC Thermistors 100 OHM 20% SMD 0603 PRG18BB101MB1RB Murata Electronics 1: S/1.01 41,785In 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	41,785In Stock 32,000Expected 12/3/2026	Cut Tape S/1.01 S/0.911 S/0.755 S/0.631 Reel S/0.405 View S/0.592 S/0.444 S/0.362 S/0.35 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 0603 47ohm 20% SMD PRG18BB470MB1RB Murata Electronics 1: S/1.52 56,766In 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	56,766In Stock 44,000Expected 11/26/2026	Cut Tape S/1.52 S/1.32 S/1.12 S/0.926 Reel S/0.607 View S/0.852 S/0.666 S/0.549 S/0.545 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 2.2 OHM 20% SMD 0603 PRG18BC2R2MM1RB Murata Electronics 1: S/1.60 Non-Stocked Lead-Time 10 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 10 Weeks	Cut Tape S/1.60 S/1.45 S/1.14 S/1.02 Reel S/0.654 View S/0.923 S/0.716 S/0.588 S/0.584 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 3.3 OHM 20% SMD 0603 PRG18BC3R3MM1RB Murata Electronics 1: S/1.52 3,344In Stock NRND	Mfr. Part # PRG18BC3R3MM1RB Mouser Part # 81-PRG18BC3R3MM1RB NRND	Murata Electronics	PTC Thermistors 3.3 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	3,344In Stock	Cut Tape S/1.52 S/1.39 S/1.16 S/0.958 Reel S/0.759 View S/0.884 S/0.79 S/0.689 S/0.677 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
Aluminum Organic Polymer Capacitors 15UF 25V ESR=40 ECASD31E156M040KA0 Murata Electronics 1: S/6.46 2,816In Stock 3,000Expected 12/21/2026	Mfr. Part # ECASD31E156M040KA0 Mouser Part # 81-ECASD31E156M040KA	Murata Electronics	Aluminum Organic Polymer Capacitors 15UF 25V ESR=40 Learn More about Murata Electronics murataecaspolymer	Datasheet	2,816In Stock 3,000Expected 12/21/2026	Cut Tape S/6.46 S/3.43 S/3.12 S/2.57 Reel S/2.09 View S/2.40 S/1.99	Min.: 1 Mult.: 1 : 3,000
Aluminum Organic Polymer Capacitors ECASD40E337M006KA0 Murata Electronics 1: S/7.24 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 S/7.24 S/4.90 S/3.93 S/3.54 Reel S/2.57 View S/2.78 S/2.44 MouseReel Available	Min.: 1 Mult.: 1 Max.: 9,000 : 3,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BG471QB5RB Murata Electronics 1: S/0.662 28,053In Stock 28,000Expected 10/19/2026	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	28,053In Stock 28,000Expected 10/19/2026	Cut Tape S/0.662 S/0.599 S/0.525 S/0.498 Reel S/0.362 View S/0.436 S/0.378 S/0.343 S/0.335 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 42 OHM 20% SMD 0805 PRG21AR420MB1RA Murata Electronics 1: S/2.18 6,096In Stock	Mfr. Part # PRG21AR420MB1RA Mouser Part # 81-PRG21AR420MB1RA	Murata Electronics	PTC Thermistors 42 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	6,096In Stock	Cut Tape S/2.18 S/1.97 S/1.82 S/1.65 View Reel S/1.17 S/1.48 S/1.39 S/1.25 S/1.18 S/1.17 MouseReel Available	Min.: 1 Mult.: 1 : 4,000

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