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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Part #

PTC (Positive Temperature Coefficient) Thermistors 1 OHM 20% SMD 0805

PRG21BC1R0MM1RA
Murata Electronics
1: $0.80
8,231In Stock

Mfr. Part No.
PRG21BC1R0MM1RA

Mouser Part No
81-PRG21BC1R0MM1RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 1 OHM 20% SMD 0805

Learn More

Datasheet

8,231In Stock

Cut Tape

$0.80

$0.752

$0.702

$0.667

View

Reel

$0.402

MouseReel Available

Min.: 1
Mult.: 1

Reel: 4,000

PRG21-MM1RA

1 Ohms

20 %

PCB Mount

SMD/SMT

- 20 C

+ 85 C

Reel, Cut Tape, MouseReel

PTC (Positive Temperature Coefficient) Thermistors

PRG21AR220MS5RA
Murata Electronics
1: $1.58
4,380In Stock

Mfr. Part No.
PRG21AR220MS5RA

Mouser Part No
81-PRG21AR220MS5RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

4,380In Stock

Cut Tape

$1.58

$1.20

$1.04

$1.00

View

Reel

$0.554

Min.: 1
Mult.: 1

Reel: 4,000

PRG21-MS5RA

22 Ohms

20 %

PCB Mount

SMD/SMT

- 40 C

+ 105 C

Reel, Cut Tape

PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603

PRG18BB330MS1RB
Murata Electronics
1: $0.64
7,500In Stock
4,000Expected 14/04/2026

Mfr. Part No.
PRG18BB330MS1RB

Mouser Part No
81-PRG18BB330MS1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603

Learn More

Datasheet

7,500In Stock

4,000Expected 14/04/2026

Cut Tape

$0.64

$0.595

$0.552

$0.526

View

Reel

$0.429

MouseReel Available

Min.: 1
Mult.: 1

Reel: 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 22 OHM 20% SMD 0805

PRG21AR220MS1RK
Murata Electronics
1: $0.672
10,664In Stock

Mfr. Part No.
PRG21AR220MS1RK

Mouser Part No
81-PRG21AR220MS1RK

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805

Learn More

Datasheet

10,664In Stock

Cut Tape

$0.672

$0.626

$0.584

$0.555

View

Reel

$0.392

MouseReel Available

Min.: 1
Mult.: 1

Reel: 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 22 OHM 20% SMD 0805

PRG21BB220MB1RK
Murata Electronics
1: $0.752
9,233In Stock

Mfr. Part No.
PRG21BB220MB1RK

Mouser Part No
81-PRG21BB220MB1RK

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 22 OHM 20% SMD 0805

Learn More

Datasheet

9,233In Stock

Cut Tape

$0.752

$0.702

$0.656

$0.622

View

Reel

$0.482

MouseReel Available

Min.: 1
Mult.: 1

Reel: 3,000

PRG21-MB1RK

22 Ohms

20 %

PCB Mount

SMD/SMT

- 10 C

+ 60 C

Reel, Cut Tape, MouseReel

PTC (Positive Temperature Coefficient) Thermistors 470 OHM 20% SMD 0603

PRG18BB470MB1RB
Murata Electronics
1: $0.512
11,467In Stock
32,000On Order

Mfr. Part No.
PRG18BB470MB1RB

Mouser Part No
81-PRG18BB470MB1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 470 OHM 20% SMD 0603

Learn More

Datasheet

11,467In Stock

32,000On Order

Cut Tape

$0.512

$0.475

$0.419

$0.397

Reel

$0.307

View

MouseReel Available

Min.: 1
Mult.: 1

Reel: 4,000

PRG18-MB1RB

47 Ohms

20 %

PCB Mount

SMD/SMT

- 20 C

+ 75 C

Reel, Cut Tape, MouseReel

PTC (Positive Temperature Coefficient) Thermistors 15 OHM 20% SMD 0805

PRG21BB150MB1RK
Murata Electronics
1: $0.688
11,531In Stock

Mfr. Part No.
PRG21BB150MB1RK

Mouser Part No
81-PRG21BB150MB1RK

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 15 OHM 20% SMD 0805

Learn More

Datasheet

11,531In Stock

Cut Tape

$0.688

$0.646

$0.605

$0.581

View

Reel

$0.421

MouseReel Available

Min.: 1
Mult.: 1

Reel: 3,000

PRG21-MB1RK

15 Ohms

20 %

PCB Mount

SMD/SMT

- 10 C

+ 60 C

Reel, Cut Tape, MouseReel

PTC (Positive Temperature Coefficient) Thermistors 6.8 OHM 20% SMD 0805

PRG21BC6R8MM1RA
Murata Electronics
1: $0.768
13,857In Stock
12,000Expected 23/02/2026

Mfr. Part No.
PRG21BC6R8MM1RA

Mouser Part No
81-PRG21BC6R8MM1RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 6.8 OHM 20% SMD 0805

Learn More

Datasheet

13,857In Stock

12,000Expected 23/02/2026

Cut Tape

$0.768

$0.722

$0.672

$0.64

View

Reel

$0.475

MouseReel Available

Min.: 1
Mult.: 1

Reel: 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: $0.672
2,883In Stock

Mfr. Part No.
PRG18BB101MS1RB

Mouser Part No
81-PRG18BB101MS1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603

Learn More

Datasheet

2,883In Stock

Cut Tape

$0.672

$0.626

$0.584

$0.555

View

Reel

$0.406

MouseReel Available

Min.: 1
Mult.: 1

Reel: 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 470 OHM 20% SMD 0603

PRG18BB471MB1RB
Murata Electronics
1: $0.336
129In Stock
16,000On Order

Mfr. Part No.
PRG18BB471MB1RB

Mouser Part No
81-PRG18BB471MB1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 470 OHM 20% SMD 0603

Learn More

Datasheet

129In Stock

16,000On Order

Cut Tape

$0.336

$0.317

$0.278

$0.264

Reel

$0.168

View

MouseReel Available

Min.: 1
Mult.: 1

Reel: 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: $0.512
6,946In Stock
20,000Expected 5/03/2026

Mfr. Part No.
PRG18BC220MM1RB

Mouser Part No
81-PRG18BC220MM1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

6,946In Stock

20,000Expected 5/03/2026

Cut Tape

$0.512

$0.485

$0.429

$0.408

Reel

$0.325

View

MouseReel Available

Min.: 1
Mult.: 1

Reel: 4,000

PRG18-MM1RB

22 Ohms

20 %

PCB Mount

SMD/SMT

- 20 C

+ 85 C

Reel, Cut Tape, MouseReel

PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805

PRG21AR420MS1RA
Murata Electronics
1: $0.656
1,584In Stock

Mfr. Part No.
PRG21AR420MS1RA

Mouser Part No
81-PRG21AR420MS1RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805

Learn More

Datasheet

1,584In Stock

Cut Tape

$0.656

$0.614

$0.573

$0.544

View

Reel

$0.395

MouseReel Available

Min.: 1
Mult.: 1

Reel: 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

PRG21BC3R3MM1RA
Murata Electronics
1: $0.816
2,808In Stock

Mfr. Part No.
PRG21BC3R3MM1RA

Mouser Part No
81-PRG21BC3R3MM1RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

2,808In Stock

Cut Tape

$0.816

$0.765

$0.714

$0.68

View

Reel

$0.518

MouseReel Available

Min.: 1
Mult.: 1

Reel: 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 100 OHM 20% SMD 0603

PRG18BB101MB1RB
Murata Electronics
1: $0.352
12,320In Stock
8,000Expected 1/05/2026

Mfr. Part No.
PRG18BB101MB1RB

Mouser Part No
81-PRG18BB101MB1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 100 OHM 20% SMD 0603

Learn More

Datasheet

12,320In Stock

8,000Expected 1/05/2026

Cut Tape

$0.352

$0.325

$0.285

$0.27

Reel

$0.211

View

MouseReel Available

Min.: 1
Mult.: 1

Reel: 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: $0.336
13,772In Stock
32,000On Order

Mfr. Part No.
PRG18BB221MB1RB

Mouser Part No
81-PRG18BB221MB1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 220 OHM 20% SMD 0603

Learn More

Datasheet

13,772In Stock

32,000On Order

Cut Tape

$0.336

$0.315

$0.261

$0.253

Reel

$0.21

View

MouseReel Available

Min.: 1
Mult.: 1

Reel: 4,000

PRG18-MB1RB

220 Ohms

20 %

PCB Mount

SMD/SMT

- 20 C

+ 75 C

Reel, Cut Tape, MouseReel

PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603

PRG18BB330MB1RB
Murata Electronics
1: $0.384
241In Stock
55,700On Order

Mfr. Part No.
PRG18BB330MB1RB

Mouser Part No
81-PRG18BB330MB1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 33 OHM 20% SMD 0603

Learn More

Datasheet

241In Stock

55,700On Order

Cut Tape

$0.384

$0.339

$0.298

$0.27

Reel

$0.174

View

MouseReel Available

Min.: 1
Mult.: 1

Reel: 4,000

PRG18-MB1RB

33 Ohms

20 %

PCB Mount

SMD/SMT

- 20 C

+ 75 C

Reel, Cut Tape, MouseReel

PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805

PRG21AR420MB1RA
Murata Electronics
1: $0.688
4,130In Stock

Mfr. Part No.
PRG21AR420MB1RA

Mouser Part No
81-PRG21AR420MB1RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 42 OHM 20% SMD 0805

Learn More

Datasheet

4,130In Stock

Cut Tape

$0.688

$0.646

$0.608

$0.582

View

Reel

$0.469

MouseReel Available

Min.: 1
Mult.: 1

Reel: 4,000

PRG21-MB1RA

42 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: $0.976
2,491In Stock
4,000Expected 13/04/2026

Mfr. Part No.
PRG21BC0R2MM1RA

Mouser Part No
81-PRG21BC0R2MM1RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 0.2 OHM 20% SMD 0805

Learn More

Datasheet

2,491In Stock

4,000Expected 13/04/2026

Cut Tape

$0.976

$0.917

$0.858

$0.816

View

Reel

$0.52

MouseReel Available

Min.: 1
Mult.: 1

Reel: 4,000

PRG21-MM1RA

200 mOhms

20 %

PCB Mount

SMD/SMT

- 20 C

+ 85 C

Reel, Cut Tape, MouseReel

PTC (Positive Temperature Coefficient) Thermistors 0.6 OHM 20% SMD 0805

PRG21BC0R6MM1RA
Murata Electronics
1: $0.784
475In Stock
4,000Expected 12/03/2026

Mfr. Part No.
PRG21BC0R6MM1RA

Mouser Part No
81-PRG21BC0R6MM1RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 0.6 OHM 20% SMD 0805

Learn More

Datasheet

475In Stock

4,000Expected 12/03/2026

Cut Tape

$0.784

$0.733

$0.69

$0.666

View

Reel

$0.538

MouseReel Available

Min.: 1
Mult.: 1

Reel: 4,000

PRG21-MM1RA

600 mOhms

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: $0.768
3,723In Stock

Mfr. Part No.
PRG21BC2R2MM1RA

Mouser Part No
81-PRG21BC2R2MM1RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 2.2 OHM 20% SMD 0805

Learn More

Datasheet

3,723In Stock

Cut Tape

$0.768

$0.723

$0.675

$0.643

View

Reel

$0.477

MouseReel Available

Min.: 1
Mult.: 1

Reel: 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 4.7 OHM 20% SMD 0805

PRG21BC4R7MM1RA
Murata Electronics
1: $0.768
3,985In Stock
4,000Expected 18/02/2026

Mfr. Part No.
PRG21BC4R7MM1RA

Mouser Part No
81-PRG21BC4R7MM1RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 4.7 OHM 20% SMD 0805

Learn More

Datasheet

3,985In Stock

4,000Expected 18/02/2026

Cut Tape

$0.768

$0.723

$0.675

$0.642

View

Reel

$0.443

MouseReel Available

Min.: 1
Mult.: 1

Reel: 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

PRG18BB221MS1RB
Murata Electronics
4,000: $0.366
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
PRG18BB221MS1RB

Mouser Part No
81-PRG18BB221MS1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$0.366

Min.: 4,000
Mult.: 4,000

Reel: 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: $0.366
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
PRG18BB470MS1RB

Mouser Part No
81-PRG18BB470MS1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

$0.366

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: $0.363
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
PRG18BB471MS1RB

Mouser Part No
81-PRG18BB471MS1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$0.363

Min.: 4,000
Mult.: 4,000

Reel: 4,000

PRG18-MS1RB

470 Ohms

20 %

PCB Mount

SMD/SMT

- 40 C

+ 75 C

AEC-Q100

Reel

PTC (Positive Temperature Coefficient) Thermistors

PRG21AR220MB1RK
Murata Electronics
1: $1.04
Lead-Time 12 Weeks

Mfr. Part No.
PRG21AR220MB1RK

Mouser Part No
81-PRG21AR220MB1RK

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

Lead-Time 12 Weeks

Cut Tape

$1.04

$0.789

$0.678

$0.656

View

Reel

$0.374

MouseReel Available

Min.: 1
Mult.: 1

Reel: 3,000

PRG21-MS5RA

22 Ohms

20 %

PCB Mount

SMD/SMT

- 10 C

+ 60 C

Reel, Cut Tape, MouseReel

PRG Series PTC Thermistors

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