PTC linear thermistor

feature
The resistance of LPTC linear thermistor increases linearly with temperature, showing good linearity. Compared with PTC polymer ceramic synthesized thermistor, LPTC linear thermistor has better linearity and does not require linear compensation measures to simplify circuit design.

①What is temperature coefficient
AnswerThe temperature coefficient refers to the high and low rate of change of the resistance value of a linear thermistor as the temperature rises and falls. Example: Room temperature (25 degrees) 1K A 300OPPM thermistor changes its resistance value by 0.3% for every 1 degree temperature change. When the temperature rises from 25 degrees to 105 degrees, the resistance value changes from lK to lK X(l+0.3%X(l05-25))=1.240K。 The larger the temperature coefficient, the greater the rate of change in resistance.
The resistance change rate is not only determined by the temperature coefficient during production by the manufacturer, but users can also increase the gain of the integrated amplifier and increase the change rate (PPM) during circuit design; By connecting ordinary resistors in series or parallel with thermistors, the rate of change can be reduced(PPM)。
②What is a positive temperature linear thermistor?
AnswerThere is a common non-linear change in resistance and temperature in the thermistor part, and a linear compensation circuit needs to be designed. This product can maintain linear changes in resistance and temperature within the range of -40 degrees to 250 degrees, thereby simplifying the circuit. At present, the resistance temperature characteristics of commonly used PTC positive temperature thermistors are abrupt, with a narrow linear region. They are usually used for overcurrent protection in circuits and not for temperature detection or compensation circuits. This product perfectly complements the application areas of these ten thousand fields.
③What other convenient aspects are there when designing and trying out this product?

Answer
Thermistors with the same temperature coefficient can be used in series or in parallel, and their resistance temperature characteristics remain unchanged. For example: lK
2OOOPPM， It can be connected in series to form 2K 2O0OPPM or in parallel to form 500 Ω 20OOPPM, providing convenience for circuit experiments, obtaining the best data, facilitating orders, and mass production.
Scope of application
1. Characteristics of SMD linear thermistor:
·Small size
·Leadless, suitable for high-density surface mount
·Excellent weldability and heat shock resistance·Suitable for wave soldering and reflow soldering
2. Application of PTC patch linear thermistor:·Various circuits that require temperature compensation, such as semiconductor ceramic capacitors, liquid crystal displays, transistors, and quartz oscillators used in mobile communication devices,
Precision circuit and crystal oscillator temperature compensation·Temperature detection of rechargeable batteries,Temperature detection and control in the automotive industry
·Temperature detection of computer microprocessors,Temperature detection and control of household appliances,