PTC (Positive Temperature Coefficient) Thermistors

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PRG Series PTC Thermistors

Murata Electronics PRG Series PTC Thermistors are posistors for overcurrent protection that offer a voltage rating up to 32V and a current range of 10mA to 75mA. These thermistors feature a compact design, low profile, and a wide operating temperature range of -20°C to +85°C. PRG thermistors automatically return to their initial state when the overcurrent is eliminated and can be used repeatedly. Murata Electronics PRG Series PTC Thermistors are suitable for various types of equipment, including aircraft, aerospace, disaster, medical, crime prevention, and transportation.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (IDR) 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 PRG21BC1R0MM1RK Murata Electronics 1: Rp9.540 25.041In Stock	Mfr. Part No. PRG21BC1R0MM1RK Mouser Part No 81-PRG21BC1R0MM1RK	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	25.041In Stock	Cut Tape Rp9.540 Rp8.953 Rp8.347 Rp7.944 View Reel Rp5.100 Rp7.577 Rp6.715 Rp6.073 Rp5.100 MouseReel Available	Min.: 1 Mult.: 1 : 3.000	PRG21-MM1RK	1 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 85 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 15 OHM 20% SMD 0805 PRG21BB150MB1RK Murata Electronics 1: Rp10.090 9.094In Stock	Mfr. Part No. PRG21BB150MB1RK Mouser Part No 81-PRG21BB150MB1RK	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 15 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	9.094In Stock	Cut Tape Rp10.090 Rp9.393 Rp7.925 Rp7.669 View Reel Rp4.752 Rp7.247 Rp6.568 Rp6.238 Rp5.852 Rp4.752 MouseReel Available	Min.: 1 Mult.: 1 : 3.000	PRG21-MB1RK	15 Ohms	20 %	PCB Mount	SMD/SMT	- 10 C	+ 60 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 0.2 OHM 20% SMD 0805 PRG21BC0R2MM1RA Murata Electronics 1: Rp13.760 8.124In Stock	Mfr. Part No. PRG21BC0R2MM1RA Mouser Part No 81-PRG21BC0R2MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0.2 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	8.124In Stock	Cut Tape Rp13.760 Rp12.237 Rp10.457 Rp10.017 View Reel Rp5.320 Rp9.650 Rp8.678 Rp8.219 Rp6.128 Rp5.320 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG21-MM1RA	200 mOhms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 85 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805 PRG21AR220MS1RK Murata Electronics 1: Rp11.008 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 Rp11.008 Rp9.045 Rp8.641 Rp7.522 View Reel Rp4.476 Rp6.605 Rp6.403 Rp5.559 Rp5.155 Rp4.476 MouseReel Available	Min.: 1 Mult.: 1 : 3.000	PRG21-MS1RK	22 Ohms	20 %	PCB Mount	SMD/SMT	- 40 C	+ 105 C	AEC-Q100	Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 0.6 OHM 20% SMD 0805 PRG21BC0R6MM1RA Murata Electronics 1: Rp11.925 3.820In Stock	Mfr. Part No. PRG21BC0R6MM1RA Mouser Part No 81-PRG21BC0R6MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0.6 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	3.820In Stock	Cut Tape Rp11.925 Rp11.008 Rp10.402 Rp9.136 View Reel Rp6.164 Rp8.439 Rp7.577 Rp6.990 Rp6.458 Rp6.164 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG21-MM1RA	600 mOhms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 85 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603 PRG18BB330MB1RB Murata Electronics 1: Rp4.587 142.959In Stock	Mfr. Part No. PRG18BB330MB1RB Mouser Part No 81-PRG18BB330MB1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	142.959In Stock	Cut Tape Rp4.587 Rp4.220 Rp3.504 Rp2.917 Reel Rp1.890 View Rp2.734 Rp2.055 Rp1.688 Rp1.633 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG18-MB1RB	33 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 75 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603 PRG18BB101MB1RB Murata Electronics 1: Rp4.770 37.161In Stock 32.000Expected 03/12/2026	Mfr. Part No. PRG18BB101MB1RB Mouser Part No 81-PRG18BB101MB1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	37.161In Stock 32.000Expected 03/12/2026	Cut Tape Rp4.770 Rp4.293 Rp3.559 Rp2.972 Reel Rp1.908 View Rp2.789 Rp2.091 Rp1.725 Rp1.651 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG18-MB1RB	100 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 75 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 220 OHM 20% SMD 0603 PRG18BB221MB1RB Murata Electronics 1: Rp4.953 32.080In 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	32.080In Stock 96.000On Order On Order Ship Dates Mfr. No: PRG18BB221MB1RB Stock: 32.080 Can Dispatch Immediately On Order: 36.000 Expected 03/12/2026 60.000 Expected 24/12/2026 Factory Lead Time: 12 Weeks	Cut Tape Rp4.953 Rp4.476 Rp3.669 Rp3.082 Reel Rp1.871 View Rp2.789 Rp2.055 Rp1.688 Rp1.614 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 0603 47ohm 20% SMD PRG18BB470MB1RB Murata Electronics 1: Rp6.788 53.456In Stock 44.000Expected 26/11/2026	Mfr. Part No. PRG18BB470MB1RB Mouser Part No 81-PRG18BB470MB1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 0603 47ohm 20% SMD Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	53.456In Stock 44.000Expected 26/11/2026	Cut Tape Rp6.788 Rp6.017 Rp5.045 Rp4.183 Reel Rp2.917 View Rp3.944 Rp3.449 Rp2.587 Rp2.568 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG18-MB1RB	47 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 75 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 470 OHM 20% SMD 0603 PRG18BB471MB1RB Murata Electronics 1: Rp4.587 38.208In Stock 24.000Expected 16/11/2026	Mfr. Part No. PRG18BB471MB1RB Mouser Part No 81-PRG18BB471MB1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 470 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	38.208In Stock 24.000Expected 16/11/2026	Cut Tape Rp4.587 Rp4.220 Rp3.504 Rp2.917 Reel Rp2.036 View Rp2.789 Rp2.403 Rp1.780 Rp1.725 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG18-MB1RB	470 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 75 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors PRG18BC220MM1RB Murata Electronics 1: Rp6.238 11.419In Stock	Mfr. Part No. PRG18BC220MM1RB Mouser Part No 81-PRG18BC220MM1RB	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	11.419In Stock	Cut Tape Rp6.238 Rp5.779 Rp5.119 Rp4.862 View Reel Rp3.614 Rp4.311 Rp3.761 Rp3.614 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4.000 : 4.000	PRG18-MM1RB	22 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 85 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805 PRG21BB220MB1RK Murata Electronics 1: Rp10.274 6.000In Stock 15.000On 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	6.000In Stock 15.000On Order On Order Ship Dates Mfr. No: PRG21BB220MB1RK Stock: 6.000 Can Dispatch Immediately On Order: 6.000 Expected 08/12/2026 9.000 Expected 11/12/2026 Factory Lead Time: 12 Weeks	Cut Tape Rp10.274 Rp9.485 Rp9.081 Rp7.870 View Reel Rp4.733 Rp7.247 Rp6.531 Rp6.017 Rp5.559 Rp4.733 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 4.7 OHM 20% SMD 0805 PRG21BC4R7MM1RA Murata Electronics 1: Rp9.173 8.226In Stock	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	8.226In Stock	Cut Tape Rp9.173 Rp8.623 Rp8.036 Rp7.650 View Reel Rp5.559 Rp7.283 Rp6.568 Rp6.183 Rp5.559 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 6.8 OHM 20% SMD 0805 PRG21BC6R8MM1RA Murata Electronics 1: Rp9.173 18.291In Stock 16.000Expected 23/11/2026	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 23/11/2026	Cut Tape Rp9.173 Rp8.604 Rp8.017 Rp7.632 View Reel Rp5.137 Rp7.265 Rp6.550 Rp6.164 Rp5.137 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG21-MM1RA	6.8 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 85 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603 PRG18BB101MS1RB Murata Electronics 1: Rp9.173 2.638In 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	2.638In Stock	Cut Tape Rp9.173 Rp8.458 Rp8.091 Rp7.027 View Reel Rp4.476 Rp6.403 Rp5.834 Rp5.375 Rp5.155 Rp4.476 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG18-MS1RB	100 Ohms	20 %	PCB Mount	SMD/SMT	- 40 C	+ 75 C	AEC-Q100	Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603 PRG18BB330MS1RB Murata Electronics 1: Rp9.173 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 Rp9.173 Rp8.458 Rp8.091 Rp7.027 View Reel Rp4.073 Rp6.403 Rp5.834 Rp5.375 Rp4.953 Rp4.073 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG18-MS1RB	33 Ohms	20 %	PCB Mount	SMD/SMT	- 40 C	+ 75 C	AEC-Q100	Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 PRG21AR420MB1RA Murata Electronics 1: Rp10.274 3.656In 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	3.656In Stock	Cut Tape Rp10.274 Rp9.283 Rp8.568 Rp7.797 View Reel Rp5.504 Rp6.953 Rp6.531 Rp5.907 Rp5.559 Rp5.504 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG21-MB1RA	42 Ohms	20 %	PCB Mount	SMD/SMT	- 10 C	+ 60 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805 PRG21AR420MS1RA Murata Electronics 1: Rp9.173 942In 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	942In Stock	Cut Tape Rp9.173 Rp8.458 Rp8.091 Rp7.027 View Reel Rp4.458 Rp6.403 Rp5.834 Rp5.375 Rp4.953 Rp4.458 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG21-MS1RA	42 Ohms	20 %	PCB Mount	SMD/SMT	- 40 C	+ 105 C	AEC-Q100	Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 1 OHM 20% SMD 0805 PRG21BC1R0MM1RA Murata Electronics 1: Rp11.191 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 Rp11.191 Rp10.237 Rp9.888 Rp8.494 View Reel Rp5.687 Rp7.760 Rp7.045 Rp6.513 Rp5.999 Rp5.687 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4.000 : 4.000	PRG21-MM1RA	1 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 85 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors 2.2 OHM 20% SMD 0805 PRG21BC2R2MM1RA Murata Electronics 1: Rp11.008 4.455In Stock 8.000Expected 05/11/2026	Mfr. Part No. PRG21BC2R2MM1RA Mouser Part No 81-PRG21BC2R2MM1RA	Murata Electronics	PTC (Positive Temperature Coefficient) Thermistors 2.2 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	4.455In Stock 8.000Expected 05/11/2026	Cut Tape Rp11.008 Rp10.035 Rp9.411 Rp8.347 View Reel Rp5.577 Rp7.705 Rp6.916 Rp6.384 Rp5.889 Rp5.577 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG21-MM1RA	2.2 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 85 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors PRG21BC3R3MM1RA Murata Electronics 1: Rp11.558 2.071In Stock	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	Cut Tape Rp11.558 Rp10.641 Rp10.292 Rp8.824 View Reel Rp5.944 Rp8.146 Rp7.320 Rp6.751 Rp6.238 Rp5.944 MouseReel Available	Min.: 1 Mult.: 1 : 4.000	PRG21-MM1RA	3.3 Ohms	20 %	PCB Mount	SMD/SMT	- 20 C	+ 85 C		Reel, Cut Tape, MouseReel
PTC (Positive Temperature Coefficient) Thermistors PRG21AR220MS5RA Murata Electronics 1: Rp18.163 4.000Expected 23/11/2026	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 23/11/2026	Cut Tape Rp18.163 Rp13.796 Rp11.888 Rp11.485 View Reel Rp6.348 Rp9.778 Rp8.494 Rp7.504 Rp6.348	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 PRG18BB221MS1RB Murata Electronics 4.000: Rp4.495 Non-Stocked Lead-Time 12 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 12 Weeks	Reel Rp4.495	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: Rp4.275 Non-Stocked Lead-Time 12 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 12 Weeks	Rp4.275	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: Rp4.275 Non-Stocked Lead-Time 12 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 12 Weeks	Reel Rp4.275	Min.: 4.000 Mult.: 4.000 : 4.000	PRG18-MS1RB	470 Ohms	20 %	PCB Mount	SMD/SMT	- 40 C	+ 75 C	AEC-Q100	Reel

PRG Series PTC Thermistors

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