PTC (Positive Temperature Coefficient) Thermistors

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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.	Series	Resistance	Tolerance	Mounting Style	Termination Style	Minimum Operating Temperature	Maximum Operating Temperature	Qualification	Packaging
PTC (Positive Temperature Coefficient) Thermistors 4.7 OHM 20% SMD 0805 PRG21BC4R7MM1RA Murata Electronics 1: $0.50 4,270In Stock 4,000Expected 2026/10/08	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	4,270In Stock 4,000Expected 2026/10/08	Cut Tape $0.50 $0.47 $0.438 $0.418 View Reel $0.304 $0.397 $0.358 $0.337 $0.304 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	PRG21-MM1RA	4.7 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 85 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors PRF18BD471RB5RB Murata Electronics 1: $0.411 7,599Expected 2026/12/04	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 2026/12/04	Cut Tape $0.411 $0.381 $0.337 $0.321 Reel $0.237 View $0.288 $0.25 $0.228 $0.223 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	PRF	470 Ohms	50 %	PCB Mount	SMD/SMT	- 20 C	+ 120 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 220 OHM 20% SMD 0603 PRG18BB221MB1RB Murata Electronics 1: $0.25 70,930On 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	70,930On Order On Order Ship Dates Mfr. No: PRG18BB221MB1RB Stock: 0 On Order: 34,930 Expected 2026/10/08 36,000 Expected 2026/12/03 Factory Lead Time: 12 Weeks	Cut Tape $0.25 $0.23 $0.191 $0.159 Reel $0.102 View $0.147 $0.112 $0.094 $0.092 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	PRG18-MB1RB	220 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 75 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805 PRG21BB220MB1RK Murata Electronics 1: $0.60 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 2026/10/01 6,000 Expected 2026/12/08 9,000 Expected 2026/12/11 Factory Lead Time: 13 Weeks	Cut Tape $0.60 $0.549 $0.511 $0.456 View Reel $0.257 $0.407 $0.378 $0.344 $0.319 $0.257 MouseReel Available	Min.: 1 Mult.: 1 : 3,000	PRG21-MB1RK	22 Ohms	20 %	PCB Mount	SMD/SMT	- 10 C	+ 60 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors PRF18BB471RB5RB Murata Electronics 1: $0.22 3,961Expected 2026/12/11	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 2026/12/11	Cut Tape $0.22 $0.206 $0.181 $0.172 Reel $0.119 View $0.152 $0.133 $0.115 $0.112 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	PRF	470 Ohms	50 %	PCB Mount	SMD/SMT	- 20 C	+ 140 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors PRG21AR220MS5RA Murata Electronics 1: $0.99 4,000Expected 2026/11/23	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 2026/11/23	Cut Tape $0.99 $0.752 $0.648 $0.626 View Reel $0.347 $0.533 $0.463 $0.409 $0.347	Min.: 1 Mult.: 1 Max.: 12,000 : 4,000	PRG21-MS5RA	22 Ohms	20 %	PCB Mount	SMD/SMT	- 40 C	+ 105 C		Reel, Cut Tape
PTC (Positive Temperature Coefficient) Thermistors PRF03BB541NB7RL Murata Electronics 1: $0.18 84Factory Stock Available	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	84Factory Stock Available More Info Available	Cut Tape $0.18 $0.149 $0.131 $0.105 Reel $0.069 View $0.092 $0.07 $0.065	Min.: 1 Mult.: 1 : 4,000	PRF	540 Ohms	30 %	PCB Mount	SMD/SMT	- 20 C	+ 150 C		Reel, Cut Tape
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 50% SMD 0805 PRF21AR471QB5RA Murata Electronics 1: $0.35 84Factory Stock Available	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	84Factory Stock Available More Info Available	Cut Tape $0.35 $0.329 $0.29 $0.276 Reel $0.202 View $0.247 $0.211 $0.197 $0.193 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	PRF	470 Ohms	50 %	PCB Mount	SMD/SMT	- 20 C	+ 150 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors PRG21AR220MB1RK Murata Electronics 1: $0.65 84Factory Stock Available	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	84Factory Stock Available More Info Available	Cut Tape $0.65 $0.493 $0.424 $0.411 View Reel $0.247 $0.349 $0.304 $0.281 $0.247 MouseReel Available	Min.: 1 Mult.: 1 : 3,000	PRG21-MS5RA	22 Ohms	20 %	PCB Mount	SMD/SMT	- 10 C	+ 60 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors PRF21AS471QB5RA Murata Electronics 4,000: $0.19 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 $0.19	Min.: 4,000 Mult.: 4,000 : 4,000	PRF	470 Ohms	50 %	PCB Mount	SMD/SMT	- 20 C	+ 160 C		Reel
PTC (Positive Temperature Coefficient) Thermistors PRG18BB221MS1RB Murata Electronics 4,000: $0.233 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 $0.233	Min.: 4,000 Mult.: 4,000 : 4,000	PRG18-MS1RB	220 Ohms	20 %	PCB Mount	SMD/SMT	- 40 C	+ 75 C	AEC-Q100	Reel
PTC (Positive Temperature Coefficient) Thermistors PRG18BB470MS1RB Murata Electronics 4,000: $0.233 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	$0.233	Min.: 4,000 Mult.: 4,000	PRG18-MS1RB	47 Ohms	20 %	PCB Mount	SMD/SMT	- 40 C	+ 75 C	AEC-Q100	Bulk
PTC (Positive Temperature Coefficient) Thermistors PRG18BB471MS1RB Murata Electronics 4,000: $0.233 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 $0.233	Min.: 4,000 Mult.: 4,000 : 4,000	PRG18-MS1RB	470 Ohms	20 %	PCB Mount	SMD/SMT	- 40 C	+ 75 C	AEC-Q100	Reel

POSISTOR® PTC Thermistors

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