The Differences Between NTC and PTC Thermistors

This application note explores the fundamental differences between Negative Temperature Coefficient (NTC) and Positive Temperature Coefficient (PTC) thermistors, outlining their unique resistance-temperature relationships and various sensing and protection functions. It also examines the role of constant power control in improving system stability and reliability—particularly in applications where temperature accuracy and safe operation are critical. Real-world use cases in automotive, medical, and electronic systems are included to illustrate the practical benefits of these materials and power strategies.