Surface mounted type fuse

12 Amperes(small) SFJ Series Self Control Protector(SCP)

Suitable for compact and slimline mobile devices.

  • Product name
    SFJ-0412 / SFJ-0812 / SFJ-1212 / SFJ-1412
  • Features
    • Achieving a low height of 0.85 mm. Suitable for compact and slimline mobile devices.
    • 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.


Product name SFJ-0412 SFJ-0812 SFJ-1212 SFJ-1412
Applicable cells in series 1 cell 2 cells 3 cells 4 cells
Rated current (A) 12
Rated voltage (VDC)* /
Rated breaking capacity (A)
36/50 (UL/TUV)
48/200, 25/250 (UL)
Operating voltage (V) 3.0 to 4.5 4.0 to 9.0 7.4 to 13.8 10.5 to 19.6
Heater resistance (Ω) 0.6 to 1.5 2.0 to 3.2 5.7 to 9.9 11.2 to 20.0
Fuse resistance (mΩ) 2.4
Dimension (mm) 4.0 x 3.0 x 0.85
  • * 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
<Recommended land size>
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.

Suitable for Li-ion battery pack for smartphones, tablet PCs, notebook PCs, cordless power tools, storage batteries, power-assisted bicycles, electric motorcycles, electric cars, and other similar battery powered devices.


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.