1 & gt；
Ptc is the abbreviation of American parametric technology company, and its full name is parametric technology company, which mainly produces product process software, such as cad, pdm, plm and so on.
2 & gt
PTC is the abbreviation of positive temperature coefficient, which means positive temperature coefficient, and generally refers to semiconductor materials or components with large temperature coefficient. Usually we refer to PTC as a thermistor with positive temperature coefficient, which is called PTC thermistor for short.