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

PRG21AR220MS5RA
Murata Electronics
1: $1.35
1,054In Stock
4,000Expected 30/9/2026

Mfr. Part No.
PRG21AR220MS5RA

Mouser Part No
81-PRG21AR220MS5RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

1,054In Stock

4,000Expected 30/9/2026

Cut Tape

$1.35

$1.02

$0.881

$0.851

View

Reel

$0.471

Min.: 1
Mult.: 1

: 4,000

PRG21-MS5RA

22 Ohms

20 %

PCB Mount

SMD/SMT

- 40 C

+ 105 C

Reel, Cut Tape

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

PRG18BB101MB1RB
Murata Electronics
1: $0.313
32,391In Stock
20,000Expected 21/8/2026

Mfr. Part No.
PRG18BB101MB1RB

Mouser Part No
81-PRG18BB101MB1RB

Murata Electronics

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

Learn More

Datasheet

32,391In Stock

20,000Expected 21/8/2026

Cut Tape

$0.313

$0.284

$0.25

$0.238

Reel

$0.174

View

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 33 OHM 20% SMD 0603

PRG18BB330MB1RB
Murata Electronics
1: $0.299
69,605In Stock
100,000Expected 4/8/2026

Mfr. Part No.
PRG18BB330MB1RB

Mouser Part No
81-PRG18BB330MB1RB

Murata Electronics

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

Learn More

Datasheet

69,605In Stock

100,000Expected 4/8/2026

Cut Tape

$0.299

$0.28

$0.246

$0.233

Reel

$0.158

View

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 33 OHM 20% SMD 0603

PRG18BB330MS1RB
Murata Electronics
1: $0.585
9,425In Stock

Mfr. Part No.
PRG18BB330MS1RB

Mouser Part No
81-PRG18BB330MS1RB

Murata Electronics

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

Learn More

Datasheet

9,425In Stock

Cut Tape

$0.585

$0.543

$0.506

$0.48

View

Reel

$0.348

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 0603 47ohm 20% SMD

PRG18BB470MB1RB
Murata Electronics
1: $0.449
88,532In Stock

Mfr. Part No.
PRG18BB470MB1RB

Mouser Part No
81-PRG18BB470MB1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors 0603 47ohm 20% SMD

Learn More

Datasheet

88,532In Stock

Cut Tape

$0.449

$0.42

$0.371

$0.335

Reel

$0.25

View

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: $0.299
24,501In Stock
28,000Expected 22/9/2026

Mfr. Part No.
PRG18BB471MB1RB

Mouser Part No
81-PRG18BB471MB1RB

Murata Electronics

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

Learn More

Datasheet

24,501In Stock

28,000Expected 22/9/2026

Cut Tape

$0.299

$0.28

$0.246

$0.234

Reel

$0.169

View

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: $0.462
18,841In Stock

Mfr. Part No.
PRG18BC220MM1RB

Mouser Part No
81-PRG18BC220MM1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

18,841In Stock

Cut Tape

$0.462

$0.428

$0.379

$0.36

Reel

$0.276

View

MouseReel Available

Min.: 1
Mult.: 1

: 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

PRG21AR220MS1RK
Murata Electronics
1: $0.694
6,994In 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

6,994In Stock

Cut Tape

$0.694

$0.651

$0.577

$0.558

View

Reel

$0.37

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 15 OHM 20% SMD 0805

PRG21BB150MB1RK
Murata Electronics
1: $0.653
10,449In 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

10,449In Stock

Cut Tape

$0.653

$0.609

$0.568

$0.54

View

Reel

$0.379

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: $0.843
8,176In 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

Datasheet

8,176In Stock

Cut Tape

$0.843

$0.796

$0.743

$0.707

View

Reel

$0.522

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

PRG21BC3R3MM1RA
Murata Electronics
1: $0.721
5,605In Stock

Mfr. Part No.
PRG21BC3R3MM1RA

Mouser Part No
81-PRG21BC3R3MM1RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

5,605In Stock

Cut Tape

$0.721

$0.676

$0.631

$0.601

View

Reel

$0.441

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 6.8 OHM 20% SMD 0805

PRG21BC6R8MM1RA
Murata Electronics
1: $0.68
19,080In Stock
16,000Expected 8/10/2026

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

19,080In Stock

16,000Expected 8/10/2026

Cut Tape

$0.68

$0.638

$0.594

$0.566

View

Reel

$0.381

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: $0.585
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

Datasheet

2,638In Stock

Cut Tape

$0.585

$0.543

$0.506

$0.48

View

Reel

$0.339

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 220 OHM 20% SMD 0603

PRG18BB221MB1RB
Murata Electronics
1: $0.299
5,839In Stock
56,000Expected 8/10/2026

Mfr. Part No.
PRG18BB221MB1RB

Mouser Part No
81-PRG18BB221MB1RB

Murata Electronics

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

Learn More

Datasheet

5,839In Stock

56,000Expected 8/10/2026

Cut Tape

$0.299

$0.28

$0.246

$0.234

Reel

$0.174

View

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 42 OHM 20% SMD 0805

PRG21AR420MB1RA
Murata Electronics
1: $0.639
2,132In Stock
4,000Expected 18/8/2026

Mfr. Part No.
PRG21AR420MB1RA

Mouser Part No
81-PRG21AR420MB1RA

Murata Electronics

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

Learn More

Datasheet

2,132In Stock

4,000Expected 18/8/2026

Cut Tape

$0.639

$0.605

$0.564

$0.537

View

Reel

$0.377

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: $0.585
1,242In 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

1,242In Stock

Cut Tape

$0.585

$0.543

$0.506

$0.48

View

Reel

$0.333

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 22 OHM 20% SMD 0805

PRG21BB220MB1RK
Murata Electronics
1: $0.653
1,480In Stock
12,000On Order

Mfr. Part No.
PRG21BB220MB1RK

Mouser Part No
81-PRG21BB220MB1RK

Murata Electronics

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

Learn More

Datasheet

1,480In Stock

12,000On Order

Cut Tape

$0.653

$0.608

$0.568

$0.54

View

Reel

$0.394

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 0.6 OHM 20% SMD 0805

PRG21BC0R6MM1RA
Murata Electronics
1: $0.748
3,870In 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

Datasheet

3,870In Stock

Cut Tape

$0.748

$0.699

$0.653

$0.62

View

Reel

$0.457

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 1 OHM 20% SMD 0805

PRG21BC1R0MM1RA
Murata Electronics
1: $0.694
4,969In 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

4,969In Stock

Cut Tape

$0.694

$0.651

$0.608

$0.578

View

Reel

$0.422

MouseReel Available

Min.: 1
Mult.: 1

: 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: $0.68
3,050In Stock
4,000Expected 25/9/2026

Mfr. Part No.
PRG21BC2R2MM1RA

Mouser Part No
81-PRG21BC2R2MM1RA

Murata Electronics

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

Learn More

Datasheet

3,050In Stock

4,000Expected 25/9/2026

Cut Tape

$0.68

$0.641

$0.597

$0.568

View

Reel

$0.413

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 4.7 OHM 20% SMD 0805

PRG21BC4R7MM1RA
Murata Electronics
1: $0.68
4,440In Stock
4,000Expected 28/9/2026

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

4,440In Stock

4,000Expected 28/9/2026

Cut Tape

$0.68

$0.639

$0.596

$0.567

View

Reel

$0.412

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

PRG18BB221MS1RB
Murata Electronics
4,000: $0.317
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

$0.317

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: $0.317
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

$0.317

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: $0.317
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

$0.317

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

: 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: $0.884
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

$0.884

$0.67

$0.577

$0.558

View

Reel

$0.322

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

PRG Series PTC Thermistors

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