A thermistor, a semiconductor component, is highly responsive to temperature changes, its resistance value being extremely sensitive. This device is categorized into two types: the negative temperature coefficient (NTC) thermistor and the positive temperature coefficient (PTC) thermistor.
NTC thermistors, known for their role as temperature sensors, are employed in temperature measurement, control, and compensation. In contrast, the PTC thermistor, versatile in functionality, is utilized not only for temperature measurement and control but also serves as a heating element. Additionally, it operates as a "switch", combining the roles of a sensitive element, a heater, and a switch, hence termed a "thermal switch".
The NTC thermistor, characterized by a Negative Temperature Coefficient, exhibits a decrease in resistance as temperature ascends. Conversely, the PTC thermistor, with a Positive Temperature Coefficient, experiences an increase in resistance when the temperature exceeds a certain threshold.
The NTC thermistor is a ceramic semiconductor, a heat-sensitive crystal made from sintered metal oxides like manganese, cobalt, and nickel. Remarkably sensitive to temperature variations, its zero-power resistance value alters in tandem with the body temperature, decreasing as the temperature rises. This resistance change is exponential, with a temperature coefficient as high as 3~6%/℃. Even minor temperature shifts can trigger significant resistance alterations. Utilizing the R-T resistance-temperature curve, precise resistance values at various temperatures can be calculated, facilitating temperature measurement and control in circuits.
Features of NTC Chip Thermistor:
1. Compact and lead-free, it boasts excellent solderability, making it ideal for high-density surface mounting.
2. Its porcelain body is glass-encapsulated, offering robust moisture resistance alongside high reliability and stability.
3. It functions across a wide temperature range, from -40℃ to +125℃.
4. Precision in resistance value and B-value constancy are hallmarks of this thermistor.
Application Scope of NTC Chip Thermistor:
This thermistor finds extensive use in electronic thermometers, perpetual calendars, clock temperature displays, and electronic gifts. It is also critical in temperature sensing for rechargeable batteries in mobile phones, car phones, laptops, and smart wearable devices. Furthermore, it plays a key role in temperature compensation for transistors, ICs, and crystal oscillators in mobile communication equipment, showcasing its versatility across a range of electronic applications.