Secondary protection fuse

45A SFK Series

Suitable for power systems and high power equipment.

  • Product name
    SFK-1245 / SFK-1445 / SFK-2045 / SFK-3045 / SFK-4045 / SFK-5045
  • Features
    • Achieving rated current 45 Amperes as surface mounted fuses.
    • Applicable up to 14 cells in series.
    • Protects Li-ion batteries from overcharging (overvoltage) and overcurrent.
    • When overcharging occurs, the fuse element melts to shut off the circuit, and simultaneously the power to the heater is also cut off.
    • Placing a heater directly under the fuse element breaks the circuit quickly.

Specifications

Product name SFK-1245​ SFK-1445 SFK-2045​ SFK-3045​ SFK-4045​ SFK-5045​
Applicable cells in series 3 cells 4 cells 5 cells 6 to 7 cells 9 to 10 cells 12 to 14 cells
Rated current (A) 45
Rated voltage （VDC）*2 80
Rated breaking capacity (A) 120
Operating voltage (V) 9.8 ～ 13.5 13.0 to 18.4 16.7 to 23.5 22.3 to 31.5 33.0 to 46.9 43.7 to 62.0
Heater resistance (Ω) 1.9 ～ 2.9 3.4 to 5.1 5.6 to 8.4 10.0 to 15.0 22.0 to 33.0 38.5 ～ 57.8
Fuse resistance (mΩ) 1.1
Dimension (mm) *3 9.5 x 5.0 x 2.0 (See below diagram)
  • *1 Products Handled at Chip One Stop
  • *2 Maximum voltage at which cutoff of the fuse is possible. It is not the operating voltage for the heater.
    UL certification: File No. E167588
    TUV certification: Certificate No. J9650637
    RoHS directive: Conforming
  • ​
fuse45-chart-sfk1245.gif
<Recommended land size>
circuitboard_SFK_1106.png

These are recommended sizes and we can't guarantee the quality of product when mounted.
We recommend our customer to verify if our products could work with your design guidelines.

Application Example

Suitable for Li-ion batteries of cordless power tools, storage batteries, electric power-assisted bicycles, electric motorcycles, and other similar battery powered devices.

caution

Note on the characteristic data given - Data on the characteristics of the products described in this page based on the results of evaluations carried out by the company. This does not guarantee that the characteristics of the product conform with your usage environment. Before use, review the usage conditions based on evaluation data obtained from the equipment and substrates actually used.

Product information

Optical Semiconductor

Frequently Asked 
Questions

About Our
Products