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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 (GBP) Filter the results in the table by unit price based on your quantity.	Qty.
PTC (Positive Temperature Coefficient) Thermistors 3.3 OHM 20% SMD 0603 PRG18BC3R3MM1RB Murata Electronics 1: £0.292 3,344In Stock NRND	Mfr. Part No. PRG18BC3R3MM1RB Mouser Part No 81-PRG18BC3R3MM1RB NRND	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 3.3 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	3,344In Stock	Cut Tape £0.292 £0.268 £0.223 £0.185 Reel £0.147 View £0.17 £0.153 £0.133 £0.131 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 6.8 OHM 20% SMD 0805 PRG21BC6R8MM1RA Murata Electronics 1: £0.375 18,291In Stock 16,000Expected 30/11/2026	Mfr. Part No. PRG21BC6R8MM1RA Mouser Part No 81-PRG21BC6R8MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 6.8 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	18,291In Stock 16,000Expected 30/11/2026	Cut Tape £0.375 £0.352 £0.328 £0.313 View Reel £0.211 £0.298 £0.268 £0.252 £0.211 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PTC 0402, 10kOhms, 50%, 32VDC PRF15BB103RB6RC Murata Electronics 1: £0.113 19,665In Stock	Mfr. Part No. PRF15BB103RB6RC Mouser Part No 81-PRF15BB103RB6RC	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors PTC 0402, 10kOhms, 50%, 32VDC Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	19,665In Stock	Cut Tape £0.113 £0.101 £0.096 £0.086 Reel £0.057 View £0.077 £0.073 £0.067 £0.049 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC (Positive Temperature Coefficient) Thermistors PRF15BC102RB6RC Murata Electronics 1: £0.12 2,267In Stock 10,000Expected 24/11/2026	Mfr. Part No. PRF15BC102RB6RC Mouser Part No 81-PRF15BC102RB6RC	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	2,267In Stock 10,000Expected 24/11/2026	Cut Tape £0.12 £0.108 £0.105 £0.091 Reel £0.051 View £0.079 £0.076 £0.067 £0.05 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC (Positive Temperature Coefficient) Thermistors 1 OHM 50% SMD 0402 PRF15BD102RB6RC Murata Electronics 1: £0.113 9,576In Stock	Mfr. Part No. PRF15BD102RB6RC Mouser Part No 81-PRF15BD102RB6RC	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 1 OHM 50% SMD 0402 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	9,576In Stock	Cut Tape £0.113 £0.101 £0.088 £0.081 Reel £0.054 View £0.069 £0.066 £0.059 £0.052 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18AR471QB5RB Murata Electronics 1: £0.158 16,127In Stock	Mfr. Part No. PRF18AR471QB5RB Mouser Part No 81-PRF18AR471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	16,127In Stock	Cut Tape £0.158 £0.143 £0.126 £0.111 Reel £0.084 View £0.096 £0.086 £0.08 MouseReel Available	Min.: 1 Mult.: 1 Max.: 12,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRF18AS471QB5RB Murata Electronics 1: £0.15 2,675In Stock	Mfr. Part No. PRF18AS471QB5RB Mouser Part No 81-PRF18AS471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	2,675In Stock	Cut Tape £0.15 £0.136 £0.12 £0.113 Reel £0.082 View £0.10 £0.086 £0.078 £0.077 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BC471QB5RB Murata Electronics 1: £0.15 5,415In Stock	Mfr. Part No. PRF18BC471QB5RB Mouser Part No 81-PRF18BC471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	5,415In Stock	Cut Tape £0.15 £0.136 £0.12 £0.113 Reel £0.079 View £0.10 £0.086 £0.075 £0.072 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BC471RB5RB Murata Electronics 1: £0.308 3,481In Stock	Mfr. Part No. PRF18BC471RB5RB Mouser Part No 81-PRF18BC471RB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	3,481In Stock	Cut Tape £0.308 £0.286 £0.253 £0.241 Reel £0.18 View £0.217 £0.188 £0.168 £0.167 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BD471QB5RB Murata Electronics 1: £0.15 6,057In Stock 16,000Expected 26/11/2026	Mfr. Part No. PRF18BD471QB5RB Mouser Part No 81-PRF18BD471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	6,057In Stock 16,000Expected 26/11/2026	Cut Tape £0.15 £0.136 £0.12 £0.113 View Reel £0.082 £0.10 £0.086 £0.082 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BE471QB5RB Murata Electronics 1: £0.127 17,120In Stock	Mfr. Part No. PRF18BE471QB5RB Mouser Part No 81-PRF18BE471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	17,120In Stock	Cut Tape £0.127 £0.115 £0.101 £0.096 Reel £0.07 View £0.084 £0.072 £0.066 £0.064 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 PRF18BF471QB5RB Murata Electronics 1: £0.127 6,073In Stock 16,000Expected 07/01/2027	Mfr. Part No. PRF18BF471QB5RB Mouser Part No 81-PRF18BF471QB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	6,073In Stock 16,000Expected 07/01/2027	Cut Tape £0.127 £0.115 £0.101 £0.096 View Reel £0.07 £0.084 £0.072 £0.07 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRF18BF471RB5RB Murata Electronics 1: £0.308 3,042In Stock	Mfr. Part No. PRF18BF471RB5RB Mouser Part No 81-PRF18BF471RB5RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	3,042In Stock	Cut Tape £0.308 £0.286 £0.253 £0.241 View Reel £0.174 £0.217 £0.188 £0.174 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 PRF21BA471QB5RA Murata Electronics 1: £0.263 1,271In Stock 4,000Expected 15/12/2026	Mfr. Part No. PRF21BA471QB5RA Mouser Part No 81-PRF21BA471QB5RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	1,271In Stock 4,000Expected 15/12/2026	Cut Tape £0.263 £0.247 £0.217 £0.207 Reel £0.16 View £0.185 £0.17 £0.154 £0.144 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 PRF21BB471QB5RA Murata Electronics 1: £0.263 1,430In Stock	Mfr. Part No. PRF21BB471QB5RA Mouser Part No 81-PRF21BB471QB5RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	1,430In Stock	Cut Tape £0.263 £0.247 £0.217 £0.207 Reel £0.141 View £0.185 £0.177 £0.138 £0.136 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 PRF21BC471QB5RA Murata Electronics 1: £0.346 5,360In 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	5,360In Stock	Cut Tape £0.346 £0.296 £0.255 £0.21 Reel £0.16 View £0.185 £0.161 £0.142 £0.141 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRF21BD471QB5RA Murata Electronics 1: £0.338 318In Stock 4,000Expected 08/01/2027	Mfr. Part No. PRF21BD471QB5RA Mouser Part No 81-PRF21BD471QB5RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	318In Stock 4,000Expected 08/01/2027	Cut Tape £0.338 £0.279 £0.244 £0.215 Reel £0.141 View £0.19 £0.153 £0.135 £0.132 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603 PRG18BB101MS1RB Murata Electronics 1: £0.375 2,188In Stock	Mfr. Part No. PRG18BB101MS1RB Mouser Part No 81-PRG18BB101MS1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	2,188In Stock	Cut Tape £0.375 £0.346 £0.331 £0.287 View Reel £0.183 £0.262 £0.238 £0.22 £0.211 £0.183 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 220 OHM 20% SMD 0603 PRG18BB221MB1RB Murata Electronics 1: £0.21 5,479In 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	5,479In Stock 96,000On Order On Order Ship Dates Mfr. No: PRG18BB221MB1RB Stock: 5,479 Can Dispatch Immediately On Order: 36,000 Expected 03/12/2026 60,000 Expected 24/12/2026 Factory Lead Time: 12 Weeks	Cut Tape £0.21 £0.185 £0.149 £0.138 Reel £0.093 View £0.114 £0.10 £0.083 £0.079 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603 PRG18BB330MS1RB Murata Electronics 1: £0.375 1,345In Stock 4,000Expected 04/12/2026	Mfr. Part No. PRG18BB330MS1RB Mouser Part No 81-PRG18BB330MS1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	1,345In Stock 4,000Expected 04/12/2026	Cut Tape £0.375 £0.346 £0.331 £0.287 View Reel £0.167 £0.262 £0.238 £0.22 £0.203 £0.167 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805 PRG21AR220MS1RK Murata Electronics 1: £0.45 2,632In Stock 12,000Expected 11/12/2026	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 11/12/2026	Cut Tape £0.45 £0.37 £0.354 £0.308 View Reel £0.183 £0.271 £0.262 £0.228 £0.211 £0.183 MouseReel Available	Min.: 1 Mult.: 1 : 3,000
PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 PRG21AR420MB1RA Murata Electronics 1: £0.421 2,656In Stock 4,000Expected 28/01/2027	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	2,656In Stock 4,000Expected 28/01/2027	Cut Tape £0.421 £0.38 £0.351 £0.32 View Reel £0.225 £0.285 £0.267 £0.242 £0.228 £0.225 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 PRG21AR420MS1RA Murata Electronics 1: £0.375 817In Stock	Mfr. Part No. PRG21AR420MS1RA Mouser Part No 81-PRG21AR420MS1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	817In Stock	Cut Tape £0.375 £0.346 £0.331 £0.287 View Reel £0.182 £0.262 £0.238 £0.22 £0.203 £0.182 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC (Positive Temperature Coefficient) Thermistors 1 OHM 20% SMD 0805 PRG21BC1R0MM1RA Murata Electronics 1: £0.458 4,484In 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	4,484In Stock	Cut Tape £0.458 £0.419 £0.405 £0.347 View Reel £0.233 £0.31 £0.288 £0.265 £0.244 £0.233 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC (Positive Temperature Coefficient) Thermistors PRG21BC3R3MM1RA Murata Electronics 1: £0.473 2,071In Stock 4,000Expected 22/01/2027	Mfr. Part No. PRG21BC3R3MM1RA Mouser Part No 81-PRG21BC3R3MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	2,071In Stock 4,000Expected 22/01/2027	Cut Tape £0.473 £0.436 £0.421 £0.361 View Reel £0.244 £0.333 £0.299 £0.276 £0.255 £0.244 MouseReel Available	Min.: 1 Mult.: 1 : 4,000

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POSISTOR® PTC Thermistors

Types of Passive Components