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: CHF 0.785
1’054In Stock
4’000Expected 9/30/2026

Mfr. Part No.
PRG21AR220MS5RA

Mouser Part No
81-PRG21AR220MS5RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

1’054In Stock

4’000Expected 9/30/2026

Cut Tape

CHF 0.785

CHF 0.597

CHF 0.514

CHF 0.496

View

Reel

CHF 0.275

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: CHF 0.183
32’391In Stock
20’000Expected 8/21/2026

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 8/21/2026

Cut Tape

CHF 0.183

CHF 0.166

CHF 0.146

CHF 0.139

Reel

CHF 0.101

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: CHF 0.174
72’075In Stock
100’000Expected 8/4/2026

Mfr. Part No.
PRG18BB330MB1RB

Mouser Part No
81-PRG18BB330MB1RB

Murata Electronics

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

Learn More

Datasheet

72’075In Stock

100’000Expected 8/4/2026

Cut Tape

CHF 0.174

CHF 0.163

CHF 0.144

CHF 0.136

Reel

CHF 0.092

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: CHF 0.341
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

CHF 0.341

CHF 0.316

CHF 0.295

CHF 0.28

View

Reel

CHF 0.203

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: CHF 0.262
88’782In Stock

Mfr. Part No.
PRG18BB470MB1RB

Mouser Part No
81-PRG18BB470MB1RB

Murata Electronics

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

Learn More

Datasheet

88’782In Stock

Cut Tape

CHF 0.262

CHF 0.245

CHF 0.217

CHF 0.195

Reel

CHF 0.146

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: CHF 0.174
24’544In Stock
28’000Expected 9/22/2026

Mfr. Part No.
PRG18BB471MB1RB

Mouser Part No
81-PRG18BB471MB1RB

Murata Electronics

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

Learn More

Datasheet

24’544In Stock

28’000Expected 9/22/2026

Cut Tape

CHF 0.174

CHF 0.163

CHF 0.144

CHF 0.136

Reel

CHF 0.099

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: CHF 0.269
19’841In Stock

Mfr. Part No.
PRG18BC220MM1RB

Mouser Part No
81-PRG18BC220MM1RB

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

19’841In Stock

Cut Tape

CHF 0.269

CHF 0.25

CHF 0.221

CHF 0.21

Reel

CHF 0.161

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: CHF 0.405
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

CHF 0.405

CHF 0.38

CHF 0.337

CHF 0.325

View

Reel

CHF 0.216

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: CHF 0.381
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

CHF 0.381

CHF 0.355

CHF 0.331

CHF 0.314

View

Reel

CHF 0.221

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: CHF 0.491
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

CHF 0.491

CHF 0.464

CHF 0.433

CHF 0.412

View

Reel

CHF 0.304

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: CHF 0.42
1’605In Stock
4’000Expected 7/29/2026

Mfr. Part No.
PRG21BC3R3MM1RA

Mouser Part No
81-PRG21BC3R3MM1RA

Murata Electronics

PTC (Positive Temperature Coefficient) Thermistors

Learn More

Datasheet

1’605In Stock

4’000Expected 7/29/2026

Cut Tape

CHF 0.42

CHF 0.394

CHF 0.368

CHF 0.35

View

Reel

CHF 0.257

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: CHF 0.396
19’080In Stock
16’000Expected 10/8/2026

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 10/8/2026

Cut Tape

CHF 0.396

CHF 0.372

CHF 0.347

CHF 0.33

View

Reel

CHF 0.222

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: CHF 0.341
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

CHF 0.341

CHF 0.316

CHF 0.295

CHF 0.28

View

Reel

CHF 0.197

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: CHF 0.174
5’839In Stock
56’000Expected 10/8/2026

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 10/8/2026

Cut Tape

CHF 0.174

CHF 0.163

CHF 0.144

CHF 0.136

Reel

CHF 0.101

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: CHF 0.372
2’132In Stock
4’000Expected 8/18/2026

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 8/18/2026

Cut Tape

CHF 0.372

CHF 0.353

CHF 0.329

CHF 0.313

View

Reel

CHF 0.219

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: CHF 0.341
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

CHF 0.341

CHF 0.316

CHF 0.295

CHF 0.28

View

Reel

CHF 0.195

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: CHF 0.381
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

CHF 0.381

CHF 0.354

CHF 0.331

CHF 0.314

View

Reel

CHF 0.23

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: CHF 0.436
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

CHF 0.436

CHF 0.408

CHF 0.381

CHF 0.361

View

Reel

CHF 0.266

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: CHF 0.405
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

CHF 0.405

CHF 0.38

CHF 0.354

CHF 0.337

View

Reel

CHF 0.246

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: CHF 0.396
3’050In Stock
4’000Expected 9/25/2026

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 9/25/2026

Cut Tape

CHF 0.396

CHF 0.373

CHF 0.349

CHF 0.331

View

Reel

CHF 0.241

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: CHF 0.396
4’440In Stock
4’000Expected 9/28/2026

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 9/28/2026

Cut Tape

CHF 0.396

CHF 0.372

CHF 0.348

CHF 0.331

View

Reel

CHF 0.241

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: CHF 0.184
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

CHF 0.184

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: CHF 0.184
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

CHF 0.184

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: CHF 0.184
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

CHF 0.184

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: CHF 0.515
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

CHF 0.515

CHF 0.391

CHF 0.337

CHF 0.325

View

Reel

CHF 0.188

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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