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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 (EUR) Filter the results in the table by unit price based on your quantity.	Qty.
PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 PRG21AR420MB1RA Murata Electronics 1: 0,482 € 4.596In Stock	Mfr. Part No. PRG21AR420MB1RA Mouser Part No 81-PRG21AR420MB1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	4.596In Stock	Cut Tape 0,482 € 0,435 € 0,402 € 0,366 € View Reel 0,258 € 0,326 € 0,306 € 0,277 € 0,261 € 0,258 € MouseReel Available	Min.: 1 Mult.: 1 : 4.000
PTC (Positive Temperature Coefficient) Thermistors 1 OHM 20% SMD 0805 PRG21BC1R0MM1RA Murata Electronics 1: 0,525 € 4.759In Stock	Mfr. Part No. PRG21BC1R0MM1RA Mouser Part No 81-PRG21BC1R0MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 1 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	4.759In Stock	Cut Tape 0,525 € 0,48 € 0,451 € 0,398 € View Reel 0,267 € 0,365 € 0,33 € 0,305 € 0,281 € 0,267 € MouseReel Available	Min.: 1 Mult.: 1 Max.: 4.000 : 4.000
PTC (Positive Temperature Coefficient) Thermistors 4.7 OHM 20% SMD 0805 PRG21BC4R7MM1RA Murata Electronics 1: 0,43 € 4.226In Stock 4.000Expected 10/8/2026	Mfr. Part No. PRG21BC4R7MM1RA Mouser Part No 81-PRG21BC4R7MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 4.7 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	4.226In Stock 4.000Expected 10/8/2026	Cut Tape 0,43 € 0,404 € 0,377 € 0,359 € View Reel 0,261 € 0,341 € 0,308 € 0,29 € 0,261 € MouseReel Available	Min.: 1 Mult.: 1 : 4.000
PTC (Positive Temperature Coefficient) Thermistors PRF18BD471RB5RB Murata Electronics 1: 0,353 € 7.599Expected 12/4/2026	Mfr. Part No. PRF18BD471RB5RB Mouser Part No 81-PRF18BD471RB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	7.599Expected 12/4/2026	Cut Tape 0,353 € 0,328 € 0,29 € 0,276 € Reel 0,204 € View 0,248 € 0,215 € 0,196 € 0,192 € MouseReel Available	Min.: 1 Mult.: 1 : 4.000
PTC (Positive Temperature Coefficient) Thermistors 220 OHM 20% SMD 0603 PRG18BB221MB1RB Murata Electronics 1: 0,215 € 130.900On 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	130.900On Order On Order Ship Dates Mfr. No: PRG18BB221MB1RB Stock: 0 On Order: 34.900 Expected 10/14/2026 36.000 Expected 12/3/2026 60.000 Expected 12/14/2026 Factory Lead Time: 12 Weeks	Cut Tape 0,215 € 0,198 € 0,164 € 0,137 € Reel 0,088 € View 0,126 € 0,096 € 0,081 € 0,079 € MouseReel Available	Min.: 1 Mult.: 1 : 4.000
PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805 PRG21BB220MB1RK Murata Electronics 1: 0,516 € 24.251On 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	24.251On Order On Order Ship Dates Mfr. No: PRG21BB220MB1RK Stock: 0 On Order: 9.251 Expected 10/1/2026 6.000 Expected 12/8/2026 9.000 Expected 12/11/2026 Factory Lead Time: 13 Weeks	Cut Tape 0,516 € 0,472 € 0,439 € 0,392 € View Reel 0,221 € 0,35 € 0,325 € 0,296 € 0,274 € 0,221 € MouseReel Available	Min.: 1 Mult.: 1 : 3.000
PTC (Positive Temperature Coefficient) Thermistors PRF18BB471RB5RB Murata Electronics 1: 0,189 € 3.961Expected 12/11/2026	Mfr. Part No. PRF18BB471RB5RB Mouser Part No 81-PRF18BB471RB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	3.961Expected 12/11/2026	Cut Tape 0,189 € 0,177 € 0,156 € 0,148 € Reel 0,102 € View 0,131 € 0,114 € 0,099 € 0,096 € MouseReel Available	Min.: 1 Mult.: 1 : 4.000
PTC (Positive Temperature Coefficient) Thermistors PRG21AR220MS5RA Murata Electronics 1: 0,851 € 4.000Expected 11/23/2026	Mfr. Part No. PRG21AR220MS5RA Mouser Part No 81-PRG21AR220MS5RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	4.000Expected 11/23/2026	Cut Tape 0,851 € 0,647 € 0,557 € 0,538 € View Reel 0,298 € 0,458 € 0,398 € 0,352 € 0,298 €	Min.: 1 Mult.: 1 Max.: 12.000 : 4.000
PTC (Positive Temperature Coefficient) Thermistors PRF03BB541NB7RL Murata Electronics 1: 0,155 € Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. PRF03BB541NB7RL Mouser Part No 81-PRF03BB541NB7RL	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	Non-Stocked Lead-Time 12 Weeks	Cut Tape 0,155 € 0,128 € 0,113 € 0,09 € Reel 0,059 € View 0,079 € 0,06 € 0,056 €	Min.: 1 Mult.: 1 : 4.000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 PRF21AR471QB5RA Murata Electronics 1: 0,301 € Non-Stocked Lead-Time 11 Weeks	Mfr. Part No. PRF21AR471QB5RA Mouser Part No 81-PRF21AR471QB5RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	Non-Stocked Lead-Time 11 Weeks	Cut Tape 0,301 € 0,283 € 0,249 € 0,237 € Reel 0,174 € View 0,212 € 0,181 € 0,169 € 0,166 € MouseReel Available	Min.: 1 Mult.: 1 : 4.000
PTC (Positive Temperature Coefficient) Thermistors PRF21AS471QB5RA Murata Electronics 4.000: 0,163 € Non-Stocked Lead-Time 5 Weeks	Mfr. Part No. PRF21AS471QB5RA Mouser Part No 81-PRF21AS471QB5RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	Non-Stocked Lead-Time 5 Weeks	Reel 0,163 €	Min.: 4.000 Mult.: 4.000 : 4.000
PTC (Positive Temperature Coefficient) Thermistors PRG18BB221MS1RB Murata Electronics 4.000: 0,20 € Non-Stocked Lead-Time 8 Weeks	Mfr. Part No. PRG18BB221MS1RB Mouser Part No 81-PRG18BB221MS1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	Non-Stocked Lead-Time 8 Weeks	Reel 0,20 €	Min.: 4.000 Mult.: 4.000 : 4.000
PTC (Positive Temperature Coefficient) Thermistors PRG18BB470MS1RB Murata Electronics 4.000: 0,20 € Non-Stocked Lead-Time 4 Weeks	Mfr. Part No. PRG18BB470MS1RB Mouser Part No 81-PRG18BB470MS1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	Non-Stocked Lead-Time 4 Weeks	0,20 €	Min.: 4.000 Mult.: 4.000
PTC (Positive Temperature Coefficient) Thermistors PRG18BB471MS1RB Murata Electronics 4.000: 0,20 € Non-Stocked Lead-Time 4 Weeks	Mfr. Part No. PRG18BB471MS1RB Mouser Part No 81-PRG18BB471MS1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	Non-Stocked Lead-Time 4 Weeks	Reel 0,20 €	Min.: 4.000 Mult.: 4.000 : 4.000
PTC (Positive Temperature Coefficient) Thermistors PRG21AR220MB1RK Murata Electronics 1: 0,559 € Non-Stocked Lead-Time 5 Weeks	Mfr. Part No. PRG21AR220MB1RK Mouser Part No 81-PRG21AR220MB1RK	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	Non-Stocked Lead-Time 5 Weeks	Cut Tape 0,559 € 0,424 € 0,365 € 0,353 € View Reel 0,212 € 0,30 € 0,261 € 0,242 € 0,212 € MouseReel Available	Min.: 1 Mult.: 1 : 3.000

POSISTOR® PTC Thermistors

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