NANO Fuses

Littelfuse NANO® Fuses are fast-acting, high-performance fuses available in a wide range of available current ratings. The portfolio includes 448 NANO2® SMF Fuses, which are fast-acting fuses available in current ratings from 62mA to 15A. The 443 NANO2 series features square surface-mount, time-lag devices with a 250VAC voltage rating. Littelfuse 449 NANO2 Slo-Blo® Fuses offer enhanced inrush withstand characteristics over NANO2 Fast-Acting Fuses. The 456 series is designed to support higher current requirements and is fully compatible with lead-free solder alloys. Littelfuse 456 fuses are ideal for storage system powers, cooling fan systems for PC servers, and base station power supplies. Littelfuse NANO Fuses include additional series as well.

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Voltage Rating DC
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Maximum Operating Temperature
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Littelfuse Surface Mount Fuses 125VAC 3.15A .023ohms 448 NANO2
Datasheet
Product Comments
768In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

448 Surface Mount Fuses Fast Blow 3.15 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 701.5 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.5A .7633ohms 449 NANO2
Datasheet
Product Comments
898In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

449 Surface Mount Fuses Time Delay / Slow Blow 500 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 763.3 mOhms
Littelfuse Surface Mount Fuses 125VAC 1.5A .1186ohms 449 NANO2
Datasheet
Product Comments
980In Stock
2.000Expected 09/03/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

449 Surface Mount Fuses Time Delay / Slow Blow 1.5 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 118.6 mOhms
Littelfuse Surface Mount Fuses 125VAC 2.5A .04ohms 449 NANO2
Datasheet
Product Comments
591In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

449 Surface Mount Fuses Time Delay / Slow Blow 2.5 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 40 mOhms
Littelfuse Surface Mount Fuses 125VAC 3.5A .0261ohms 449 NANO2
Datasheet
Product Comments
16In Stock
1.000Expected 27/03/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

449 Surface Mount Fuses Time Delay / Slow Blow 3.5 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 26.1 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.16A 1.2157ohms 451 NANO2
Datasheet
44In Stock
4.000On Order
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 160 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 1.2157 Ohms
Littelfuse Surface Mount Fuses 125VAC 0.2A .8372ohms 451 NANO2
Datasheet
333In Stock
3.000On Order
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 200 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 837.2 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.25A .5765ohms 451 NANO2
Datasheet
156In Stock
38.000On Order
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 250 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 576.5 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.375A .4541ohms 451 NANO2
Datasheet
1.151In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 375 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 454.1 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.5A .3046ohms 451 NANO2
Datasheet
2.395In Stock
12.800On Order
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 500 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 304.6 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.63A .2022ohms 451 NANO2
Datasheet
1.109In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 630 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 202.2 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.75A .1444ohms 451 NANO2
Datasheet
1.298In Stock
3.000Expected 09/03/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 750 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 144.4 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.8A .1355ohms 451 NANO2
Datasheet
480In Stock
1.000Expected 09/03/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 800 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 135.5 mOhms
Littelfuse Surface Mount Fuses 125VAC 2A .0367ohms 451 NANO2
Datasheet
507In Stock
5.000Expected 09/03/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 5.000

451 Surface Mount Ceramic Fuses Fast Blow 2 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 36.7 mOhms
Littelfuse Surface Mount Fuses 125VAC 7A .009ohms 451 NANO2
Datasheet
786In Stock
7.645On Order
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 7 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 400 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 9 mOhms
Littelfuse Surface Mount Fuses 125VAC 7A .009ohms 451 NANO2
Datasheet
1.482In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 5.000

451 Surface Mount Ceramic Fuses Fast Blow 7 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 400 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 9 mOhms
Littelfuse Surface Mount Fuses 125VAC 1.6A .058ohms 451 NANO2
Datasheet
1.496In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 1.6 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 58 mOhms
Littelfuse Surface Mount Fuses 65VAC 15A .0037ohms 451 NANO2
Datasheet
53In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 5.000

451 Surface Mount Ceramic Fuses Fast Blow 15 A 65 VAC 65 VDC 100 A at 65 VAC, 150 A at 65 VDC, 400 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 3.7 mOhms
Littelfuse Surface Mount Fuses 125VAC 2.5A .0286ohms 451 NANO2
Datasheet
518In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 5.000

451 Surface Mount Ceramic Fuses Fast Blow 2.5 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 28.6 mOhms
Littelfuse Surface Mount Fuses 125VAC 3.5A .02ohms 451 NANO2
Datasheet
821In Stock
1.000Expected 13/07/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 3.5 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 20 mOhms
Littelfuse Surface Mount Fuses 125VAC 3.15A .0215ohms 451 NANO2
Datasheet
1.378In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

451 Surface Mount Ceramic Fuses Fast Blow 3.15 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 21.5 mOhms
Littelfuse Surface Mount Fuses 125VAC 1A .225ohms 452 NANO2
Datasheet
28In Stock
5.000Expected 16/06/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 5.000

452 Surface Mount Ceramic Fuses Time Delay / Slow Blow 1 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 225 mOhms
Littelfuse Surface Mount Fuses 125VAC 3.5A .0224ohms 452 NANO2
Datasheet
770In Stock
2.000Expected 07/07/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

452 Surface Mount Ceramic Fuses Time Delay / Slow Blow 3.5 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 22.4 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.4A .4233ohms 453 NANO2
Datasheet
303In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

453 Surface Mount Ceramic Fuses Fast Blow 400 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 423.3 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.5A .3046ohms 453 NANO2
Datasheet
1.352In Stock
1.000Expected 09/07/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

453 Surface Mount Ceramic Fuses Fast Blow 500 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 304.6 mOhms