Thermistors are not a specific brand but a type of temperature-sensitive resistor used in various industries. They are produced by multiple companies worldwide, including notable manufacturers like Murata (Japan), TDK (Japan), and Vishay (USA). Thermistors serve industries such as automotive, healthcare, consumer electronics, and industrial automation. Their primary products include Negative Temperature Coefficient (NTC) and Positive Temperature Coefficient (PTC) thermistors, which are used for temperature sensing, surge protection, and temperature compensation in circuits. These components are critical for applications requiring precise thermal management.