Question 10: What Is the Voltage Drop of a PPTC ?

The voltage drop of a PPTC depends on its specific model and specifications. If the resistance of the fuse and the current flowing through it under normal operating conditions are known, the voltage drop can be easily calculated.

A typical voltage drop value can be derived from the Rmax value. If Rmax is not available, the average of Rmin and R1max is generally used. Let Iop represent the normal operating current and Rp represent the resistance of the self-recovery fuse. The voltage drop (Vdrop) of the circuit can then be calculated as:

Vdrop = Iop × Rp