Ceramic PTC Chip Thermistor (CPTC) Introduction: 

Thermistor is a kind of semiconductor element whose resistance value is extremely sensitive to temperature, and can be divided into Negative Temperature Coefficient (NTC) thermistor and Positive Temperature Coefficient (PTC) 

thermistor.

NTC: Negative Temperature Coefficient. Temperature rises, resistance falls; 

PTC: Positive Temperature Coefficient. Temperature rises above the conversion temperature point, resistance rises 

CPTC: Ceramic Positive Temperature Coefficient Thermistor (Ceramic Positive Temperature Coefficient Thermistor) is a kind of thermistor designed by semiconductor ceramic material 

, the main material is barium carbonate, and add a small amount of rare earths, subject to the main elements and glass and other additives, after high temperature sintering to form a semiconductor resistor with temperature sensitivity. In the Curie 

temperature has a small resistance, more than the Curie temperature, the resistance value with the temperature increase is a step increase, used in the line overheating sensing, play a role in overheating and overcurrent protection.

Overheat Protection: Due to the sharp change in resistance caused by temperature change, a circuit connected in series with a PTC thermistor can be used to achieve accurate detection of overheating in multiple areas. It can be used for overheat detection in FETs, power 

ICs and other heat generating areas.

Overcurrent Protection: When an abnormal current passes through, the PTC heats up steeply and the resistance rises rapidly to a high resistance state, thus limiting or blocking the current and protecting the circuit from damage. After the current returns to normal, 

PTC also drops to the initial low resistance state, and the circuit returns to normal operation. Its working principle is similar to that of a fuse, and it can be reused.

Chip PTC thermistors (surface mount ceramic positive temperature coefficient thermistors) are SMD components made of ceramic materials with excellent reliability and performance. High reliability 

and fast protection characteristics make equipment safer and maintenance-free. Compared to organic PTC elements (PPTC) and chip resistors with the same characteristics, ceramic chip PTC thermistors offer 

higher reliability, less electrical variation after mounting, and longer service life. This helps customers reduce equipment size and improve performance.

CPTC Chip Thermistor features: 

1) Ceramic body surface is encapsulated with glass, good moisture resistance, high reliability and stability; 

2) Small size, no leads, excellent soldering performance, suitable for high-density surface mounting; 

3) Can reduce the number of IC ports to promote equipment miniaturization; 

4) Using the electrical impedance of rapid changes in the characteristics of the good noise immunity.

CPTC chip thermistor applications: 

1) Overheat sensing: switching power supply, hybrid circuits in the power transistors, power LEDs and power ICs overheat sensing; 

2) LCD TVs, digital cameras, audio and other audio-visual equipment, overheat sensing; 

3) computers, printers, scanners, copiers and other information equipment, overheat sensing; 

4) fax machines, cell phones, headphones, cell phone base stations and other communications equipment Overheating sensing; 

5) Overheating sensing of automotive electronic equipment such as automotive instruments, drive engine control ECUs, ABS systems, etc.; 

6) Overheating sensing of household electronic equipment such as refrigerators, air-conditioners, washing machines, and lighting equipment.