PTC Fuses for AC/DC Power Supplies

A Positive Thermal Coefficient fuse, or PTC thermistor, is a thermally sensitive semiconductor resistor that increases in resistance as temperature increases to limit current to a load. When the voltage input for a power supply is too far above or below what is specified, the excess current can damage components. Besides shutting down the power supply altogether, one can effectively limit the current by using the predictable resistive response of a PTC.

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Description Datasheet Availability Pricing (TWD) Filter the results in the table by unit price based on your quantity.
Qty. RoHS ECAD Model Series
Mounting Style
Termination Style
Hold Current
Maximum Voltage
Trip Current
Current Rating - Max
Resistance
Package / Case
Minimum Operating Temperature
Maximum Operating Temperature
Lead Spacing
Qualification
Packaging
Littelfuse Resettable Fuses - PPTC 30V 1206 .160A POLYFUSE
Datasheet
35,702In Stock
51,000Expected 12/1/2026
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

1206L SMD/SMT SMD/SMT 160 mA 30 VDC 370 mA 100 A 4.5 Ohms 1206 (3216 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 0.10A 30V 1210
Datasheet
40,387In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

1210L PCB Mount SMD/SMT 100 mA 30 VDC 300 mA 10 A 15 Ohms 1210 (3225 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 0.14A 60V 1812
Datasheet
16,006In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

1812L SMD/SMT SMD/SMT 140 mA 60 VDC 340 mA 10 A 6 Ohms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 15V 2016 1.50A SURF MOUNT
Datasheet
7,549In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

2016L SMD/SMT SMD/SMT 1.5 A 15 VDC 3 A 40 A 180 mOhms 2016 (5041 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 0.30A 60V 2920
Datasheet
19,513In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

2920L SMD/SMT SMD/SMT 300 mA 60 VDC 600 mA 10 A 4.8 Ohms 2920 (7450 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 24V 2920 2A POLYFUSE
Datasheet
7,305In Stock
18,000Expected 12/17/2026
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

2920L SMD/SMT SMD/SMT 2 A 24 VDC 4 A 40 A 125 mOhms 2920 (7450 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 10A 32V High Temp AEC-Q200
Datasheet
4,693In Stock
Min.: 1
Mult.: 1

AHEF PCB Mount Radial 10 A 32 VDC 20 A 100 A 16 mOhms - 40 C + 85 C 10.9 mm AEC-Q100 Bulk
Littelfuse Resettable Fuses - PPTC .9A 30V SMD AEC-Q200
Datasheet
4,925In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

ASMD SMD/SMT SMD/SMT 900 mA 30 VDC 2.16 A 40 A 480 mOhms 2920 (7450 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .16A 240VAC 20/2A Imax
Datasheet
13,006In Stock
Min.: 1
Mult.: 1

LVR PCB Mount Radial 160 mA 120 VAC/VDC 370 mA 20 A 7.8 Ohms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC .33A 240VAC 20/4.5A Imax
Datasheet
5,117In Stock
5,000On Order
Min.: 1
Mult.: 1

LVR PCB Mount Radial 330 mA 120 VAC/VDC 740 mA 20 A 2.6 Ohms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC .1A 60V Mini SMD AEC-Q200
Datasheet
10,211In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

miniASMD SMD/SMT SMD/SMT 100 mA 60 VDC 300 mA 40 A 12.7 Ohms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 30V 40A 1.75Ohms
Datasheet
16,275In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

miniSMD SMD/SMT SMD/SMT 300 mA 30 VDC 600 mA 40 A 1.75 Ohms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .50A 24V 100A Imax
Datasheet
35,495In Stock
86,000Expected 10/13/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

miniSMD SMD/SMT SMD/SMT 500 mA 24 VDC 1 A 100 A 1 Ohms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 24V 750MA-HD 40A MAX
Datasheet
13,096In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

miniSMD SMD/SMT SMD/SMT 750 mA 24 VDC 1.5 A 40 A 290 mOhms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 24V 1.1A-HD 40A MAX
Datasheet
50,429In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

miniSMD SMD/SMT SMD/SMT 1.1 A 24 VDC 2.2 A 20 A 180 mOhms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .12A 48V Nano SMD AEC-Q200
Datasheet
7,712In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

nanoASMDC SMD/SMT SMD/SMT 120 mA 48 VDC 390 mA 10 A 6.5 Ohms 1206 (3216 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .35A 16V Nano SMD AEC-Q200
Datasheet
8,385In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

nanoASMDC SMD/SMT SMD/SMT 350 mA 16 VDC 750 mA 20 A 1.35 Ohms 1206 (3216 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .35A RESETTABLE SMD FUSE
Datasheet
20,167In Stock
29,975Expected 9/10/2026
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

nanoSMD SMD/SMT SMD/SMT 350 mA 16 VDC 750 mA 20 A 1.35 Ohms 1206 (3216 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 1.6A 30V 100A Imax
Datasheet
15,154In Stock
Min.: 1
Mult.: 1

RUEF PCB Mount Radial 1.6 A 30 VDC 3.2 A 100 A 110 mOhms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC 3A 30V 100A Imax
Datasheet
34,857In Stock
Min.: 1
Mult.: 1

RUEF PCB Mount Radial 3 A 30 VDC 6 A 100 A 80 mOhms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC 3A 30V 100A Imax
Datasheet
8,172In Stock
Min.: 1
Mult.: 1
: 2,500

RUEF PCB Mount Radial 3 A 30 VDC 6 A 100 A 80 mOhms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 4A 30V 100A Imax
Datasheet
19,442In Stock
Min.: 1
Mult.: 1

RUEF PCB Mount Radial 4 A 30 VDC 8 A 100 A 50 mOhms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC 9A 30V 100A Imax
Datasheet
18,308In Stock
Min.: 1
Mult.: 1

RUEF PCB Mount Radial 9 A 30 VDC 18 A 100 A 20 mOhms - 40 C + 85 C 10.9 mm Bulk
Littelfuse Resettable Fuses - PPTC Radial Lead .3A 72V 40A Imax
Datasheet
Product Comments
7,985In Stock
23,500Expected 10/21/2026
Min.: 1
Mult.: 1

RXEF PCB Mount Radial 300 mA 72 VDC 600 mA 40 A 2.1 Ohms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC Radial Lead .5A 72V 40A Imax
Datasheet
Product Comments
11,400In Stock
36,500Expected 10/22/2026
Min.: 1
Mult.: 1

RXEF PCB Mount Radial 500 mA 72 VDC 1 A 40 A 1.17 Ohms - 40 C + 85 C 5.8 mm Bulk