PTC SERIES SPECIFICATION
Rate Zero-power Resistance (Rn):DC resistance value of the thermistor measured under 25℃ by adopting
sufficiently low power consumption.
Maximum Operating Voltage (Vmax) The maximum rated voltage the PTC thermistor can continuously
endure at 25℃.
Maximum Inrush Current (Imax) The maximum current (effective value) through the PTC thermistor under
max.rated voltage. Exceeding this current may result in damage to the PTC components.
Reference Temperature (Tsw) The temperature at which the resistance value of the PTC thermistor increases
to twice Rmin, also called Curie temperature.
Non-trip Current (Int) Rated current or holding current, at maximum operating temperature, this is the
maximum current value that doesn’t trip the PTC to the high resistance state. Under these conditions, PTC
performs as a fixed resistor.
Trip Current (It) The minimum current value that will cause the PTC to trip to the protective high resistance
Operating Temperature Range The ambient temperature range in which PTC can be used when the maximum
voltage is applied. Range is -10℃to+60℃.
Temperature Coefficient of Resistance(aT) The Temperature coefficient is calculated from the linear range at
the steepest portion of resistance (Tb-Tp) as illustrated in Fig.1. aT=(InRp-InRb)˙100/(Tp-Tb) (%/℃)
Dissipation Factor (δ) The ratio power dissipation change to temperature change of PTC thermistor(in mw/
Where P=dissipation power
T=thermistor body temperature