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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 (JPY) Filter the results in the table by unit price based on your quantity.	Qty.
PTC Thermistors 3.3 OHM 20% SMD 0603 PRG18BC3R3MM1RB Murata Electronics 1: ¥64.8 3,339In 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	3,339In Stock	Cut Tape ¥64.8 ¥59.3 ¥49.3 ¥40.9 Reel ¥32.4 View ¥37.7 ¥33.7 ¥29.4 ¥28.9 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 6.8 OHM 20% SMD 0805 PRG21BC6R8MM1RA Murata Electronics 1: ¥83.1 17,820In Stock 16,000Expected 11/24/2026	Mfr. Part # PRG21BC6R8MM1RA Mouser Part # 81-PRG21BC6R8MM1RA	Murata Electronics	PTC Thermistors 6.8 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	17,820In Stock 16,000Expected 11/24/2026	Cut Tape ¥83.1 ¥77.9 ¥72.6 ¥69.1 View Reel ¥46.5 ¥65.8 ¥59.3 ¥55.8 ¥46.5 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors PTC 0402, 10kOhms, 50%, 32VDC PRF15BB103RB6RC Murata Electronics 1: ¥24.9 19,665In Stock	Mfr. Part # PRF15BB103RB6RC Mouser Part # 81-PRF15BB103RB6RC	Murata Electronics	PTC Thermistors PTC 0402, 10kOhms, 50%, 32VDC Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	19,665In Stock	Cut Tape ¥24.9 ¥22.4 ¥21.3 ¥19.1 Reel ¥12.6 View ¥16.9 ¥16.3 ¥14.8 ¥10.8 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC Thermistors PRF15BC102RB6RC Murata Electronics 1: ¥26.6 12,267In Stock	Mfr. Part # PRF15BC102RB6RC Mouser Part # 81-PRF15BC102RB6RC	Murata Electronics	PTC Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	12,267In Stock	Cut Tape ¥26.6 ¥23.9 ¥23.3 ¥20.1 Reel ¥11.3 View ¥17.6 ¥16.8 ¥14.9 ¥11 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC Thermistors 1 OHM 50% SMD 0402 PRF15BD102RB6RC Murata Electronics 1: ¥24.9 9,576In Stock	Mfr. Part # PRF15BD102RB6RC Mouser Part # 81-PRF15BD102RB6RC	Murata Electronics	PTC Thermistors 1 OHM 50% SMD 0402 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	9,576In Stock	Cut Tape ¥24.9 ¥22.4 ¥19.6 ¥17.9 Reel ¥12 View ¥15.3 ¥14.6 ¥13.1 ¥11.6 MouseReel Available	Min.: 1 Mult.: 1 : 10,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18AR471QB5RB Murata Electronics 1: ¥34.9 15,977In Stock	Mfr. Part # PRF18AR471QB5RB Mouser Part # 81-PRF18AR471QB5RB	Murata Electronics	PTC Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	15,977In Stock	Cut Tape ¥34.9 ¥31.7 ¥27.9 ¥24.6 Reel ¥18.6 View ¥21.3 ¥19.1 ¥17.8 MouseReel Available	Min.: 1 Mult.: 1 Max.: 12,000 : 4,000
PTC Thermistors PRF18AS471QB5RB Murata Electronics 1: ¥33.2 2,675In Stock	Mfr. Part # PRF18AS471QB5RB Mouser Part # 81-PRF18AS471QB5RB	Murata Electronics	PTC Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	2,675In Stock	Cut Tape ¥33.2 ¥30.1 ¥26.4 ¥24.9 Reel ¥18.1 View ¥21.9 ¥19.1 ¥17.3 ¥16.9 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BC471QB5RB Murata Electronics 1: ¥33.2 5,405In Stock	Mfr. Part # PRF18BC471QB5RB Mouser Part # 81-PRF18BC471QB5RB	Murata Electronics	PTC Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	5,405In Stock	Cut Tape ¥33.2 ¥30.1 ¥26.4 ¥24.9 Reel ¥17.6 View ¥21.9 ¥19.1 ¥16.6 ¥16.1 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BC471RB5RB Murata Electronics 1: ¥68.1 3,481In Stock	Mfr. Part # PRF18BC471RB5RB Mouser Part # 81-PRF18BC471RB5RB	Murata Electronics	PTC Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	3,481In Stock	Cut Tape ¥68.1 ¥63.3 ¥56 ¥53.3 Reel ¥39.9 View ¥47.8 ¥41.5 ¥37 ¥36.9 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BD471QB5RB Murata Electronics 1: ¥33.2 6,057In Stock 16,000Expected 11/26/2026	Mfr. Part # PRF18BD471QB5RB Mouser Part # 81-PRF18BD471QB5RB	Murata Electronics	PTC Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	6,057In Stock 16,000Expected 11/26/2026	Cut Tape ¥33.2 ¥30.1 ¥26.4 ¥24.9 View Reel ¥18.1 ¥21.9 ¥19.1 ¥18.1 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BE471QB5RB Murata Electronics 1: ¥28.2 17,120In Stock	Mfr. Part # PRF18BE471QB5RB Mouser Part # 81-PRF18BE471QB5RB	Murata Electronics	PTC Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	17,120In Stock	Cut Tape ¥28.2 ¥25.6 ¥22.4 ¥21.3 Reel ¥15.4 View ¥18.6 ¥16.1 ¥14.6 ¥13.8 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0603 PRF18BF471QB5RB Murata Electronics 1: ¥28.2 6,073In Stock 16,000Expected 1/7/2027	Mfr. Part # PRF18BF471QB5RB Mouser Part # 81-PRF18BF471QB5RB	Murata Electronics	PTC Thermistors 470 OHM 50% SMD 0603 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	6,073In Stock 16,000Expected 1/7/2027	Cut Tape ¥28.2 ¥25.6 ¥22.4 ¥21.3 View Reel ¥15.4 ¥18.6 ¥16.1 ¥15.4 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC Thermistors PRF18BF471RB5RB Murata Electronics 1: ¥68.1 2,892In Stock	Mfr. Part # PRF18BF471RB5RB Mouser Part # 81-PRF18BF471RB5RB	Murata Electronics	PTC Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	2,892In Stock	Cut Tape ¥68.1 ¥63.3 ¥56 ¥53.3 View Reel ¥38.4 ¥47.8 ¥41.5 ¥38.4 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC Thermistors 470 OHM 50% SMD 0805 PRF21BA471QB5RA Murata Electronics 1: ¥58.1 1,271In Stock 4,000Expected 12/15/2026	Mfr. Part # PRF21BA471QB5RA Mouser Part # 81-PRF21BA471QB5RA	Murata Electronics	PTC Thermistors 470 OHM 50% SMD 0805 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	1,271In Stock 4,000Expected 12/15/2026	Cut Tape ¥58.1 ¥54.6 ¥48.2 ¥45.8 Reel ¥35.4 View ¥40.9 ¥37.7 ¥34.1 ¥31.9 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0805 PRF21BB471QB5RA Murata Electronics 1: ¥58.1 1,430In Stock	Mfr. Part # PRF21BB471QB5RA Mouser Part # 81-PRF21BB471QB5RA	Murata Electronics	PTC Thermistors 470 OHM 50% SMD 0805 Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	1,430In Stock	Cut Tape ¥58.1 ¥54.6 ¥48.2 ¥45.8 Reel ¥31.2 View ¥40.9 ¥39.2 ¥30.6 ¥30.1 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 470 OHM 50% SMD 0805 PRF21BC471QB5RA Murata Electronics 1: ¥76.4 4,860In 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	4,860In Stock	Cut Tape ¥76.4 ¥65.4 ¥56.5 ¥46.3 Reel ¥35.4 View ¥40.9 ¥35.5 ¥31.4 ¥31.1 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors PRF21BD471QB5RA Murata Electronics 1: ¥76.4 318In Stock 4,000Expected 1/8/2027	Mfr. Part # PRF21BD471QB5RA Mouser Part # 81-PRF21BD471QB5RA	Murata Electronics	PTC Thermistors Learn More about Murata Electronics murata prf ptc thermistors	Datasheet	318In Stock 4,000Expected 1/8/2027	Cut Tape ¥76.4 ¥63.3 ¥55.3 ¥48.8 Reel ¥31.1 View ¥43.4 ¥33.9 ¥29.9 ¥29.1 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 100 OHM 20% SMD 0603 PRG18BB101MS1RB Murata Electronics 1: ¥83.1 2,188In Stock	Mfr. Part # PRG18BB101MS1RB Mouser Part # 81-PRG18BB101MS1RB	Murata Electronics	PTC Thermistors 100 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	2,188In Stock	Cut Tape ¥83.1 ¥76.6 ¥73.3 ¥63.6 View Reel ¥40.5 ¥58 ¥52.8 ¥48.7 ¥46.7 ¥40.5 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 220 OHM 20% SMD 0603 PRG18BB221MB1RB Murata Electronics 1: ¥46.5 4,979In Stock 216,000On Order	Mfr. Part # PRG18BB221MB1RB Mouser Part # 81-PRG18BB221MB1RB	Murata Electronics	PTC Thermistors 220 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	4,979In Stock 216,000On Order On Order Ship Dates Mfr. #: PRG18BB221MB1RB Stock: 4,979 Can Ship Immediately On Order: 36,000 Expected 12/3/2026 60,000 Expected 12/24/2026 120,000 Expected 1/26/2027 Factory Lead-Time: 12 Weeks	Cut Tape ¥46.5 ¥40.9 ¥33.1 ¥30.6 Reel ¥20.4 View ¥25.2 ¥22.3 ¥18.3 ¥17.4 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 33 OHM 20% SMD 0603 PRG18BB330MS1RB Murata Electronics 1: ¥83.1 1,345In Stock 4,000Expected 12/4/2026	Mfr. Part # PRG18BB330MS1RB Mouser Part # 81-PRG18BB330MS1RB	Murata Electronics	PTC Thermistors 33 OHM 20% SMD 0603 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	1,345In Stock 4,000Expected 12/4/2026	Cut Tape ¥83.1 ¥76.6 ¥73.3 ¥63.6 View Reel ¥36.9 ¥58 ¥52.8 ¥48.7 ¥44.8 ¥36.9 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 22 OHM 20% SMD 0805 PRG21AR220MS1RK Murata Electronics 1: ¥99.7 2,632In Stock 12,000Expected 12/11/2026	Mfr. Part # PRG21AR220MS1RK Mouser Part # 81-PRG21AR220MS1RK	Murata Electronics	PTC Thermistors 22 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	2,632In Stock 12,000Expected 12/11/2026	Cut Tape ¥99.7 ¥81.9 ¥78.2 ¥68.1 View Reel ¥40.5 ¥59.8 ¥58 ¥50.3 ¥46.7 ¥40.5 MouseReel Available	Min.: 1 Mult.: 1 : 3,000
PTC Thermistors 42 OHM 20% SMD 0805 PRG21AR420MB1RA Murata Electronics 1: ¥93 656In Stock 4,000Expected 1/28/2027	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	656In Stock 4,000Expected 1/28/2027	Cut Tape ¥93 ¥84 ¥77.6 ¥70.6 View Reel ¥49.8 ¥63 ¥59.1 ¥53.5 ¥50.3 ¥49.8 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 42 OHM 20% SMD 0805 PRG21AR420MS1RA Murata Electronics 1: ¥83.1 817In Stock	Mfr. Part # PRG21AR420MS1RA Mouser Part # 81-PRG21AR420MS1RA	Murata Electronics	PTC Thermistors 42 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	817In Stock	Cut Tape ¥83.1 ¥76.6 ¥73.3 ¥63.6 View Reel ¥40.4 ¥58 ¥52.8 ¥48.7 ¥44.8 ¥40.4 MouseReel Available	Min.: 1 Mult.: 1 : 4,000
PTC Thermistors 1 OHM 20% SMD 0805 PRG21BC1R0MM1RA Murata Electronics 1: ¥101.3 4,193In Stock	Mfr. Part # PRG21BC1R0MM1RA Mouser Part # 81-PRG21BC1R0MM1RA	Murata Electronics	PTC Thermistors 1 OHM 20% SMD 0805 Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	4,193In Stock	Cut Tape ¥101.3 ¥92.7 ¥89.5 ¥76.9 View Reel ¥51.5 ¥68.6 ¥63.8 ¥58.8 ¥54 ¥51.5 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4,000 : 4,000
PTC Thermistors PRG21BC3R3MM1RA Murata Electronics 1: ¥104.6 1,691In Stock 4,000Expected 1/22/2027	Mfr. Part # PRG21BC3R3MM1RA Mouser Part # 81-PRG21BC3R3MM1RA	Murata Electronics	PTC Thermistors Learn More about Murata Electronics murata prg ptc thermistors	Datasheet	1,691In Stock 4,000Expected 1/22/2027	Cut Tape ¥104.6 ¥96.3 ¥93.2 ¥79.9 View Reel ¥53.8 ¥73.7 ¥66.3 ¥61.1 ¥56.5 ¥53.8 MouseReel Available	Min.: 1 Mult.: 1 : 4,000

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POSISTOR® PTC Thermistors

Types of Passive Components