TFPT1206L1002FZ

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Temperature Sensors - PTC Thermistors

PTC thermistors are temperature sensing devices with a Positive Temperature Coefficient (PTC) characteristics in which resistance increases with temperature. They act as thermal switches in the form of current or voltage limiters to protect against temperature overload. As this device is a solid state component, it is not affected by moisture or vibration and it does not require any additional control mechanisms to operate. The TFPT1206L1002FZ is a resistor-style NTC (Negative Thermal Coefficient) thermistor, with a negative resistance coefficient meaning that the resistance decreases as the temperature increases.

Application Field

The TFPT1206L1002FZ is ideal for situations in which a temperature limit must be accurately maintained such as in process monitoring, heating elements, power supplies, and electronics components. It is also commonly used for temperature related control systems such as air conditioning or refrigeration. PTC thermistors are used as safety devices to prevent overheating of electronic components such as CPUs, power supplies, and other high temperature components.

Working Principle

The TFPT1206L1002FZ is designed to quickly respond to any temperature changes. It is constructed with metal oxide-based sensing element surrounded by a ceramic housing. When in operation, the PTC thermistor heats up and the resistance quickly changes based on temperature. The rate of change in resistance is determined by circuitry that is connected to the thermistor which senses the resistance and adjusts the current or voltage accordingly. Unlike bi-metal switches, PTC thermistors will switch on and off at a pre-determined temperature limit, providing greater accuracy and reliability.

The TFPT1206L1002FZ can also be used as a thermistor element in metal oxide varistors (MOVs). MOVs are further protection devices that protect high voltage circuits from current surges. They are designed to absorb huge amounts of electrical energy and then divert it away from the high voltage device. PTC thermistors act as a temperature sensing element connected to a diode that increases the current within the MOVs. When the temperature of the thermistor reaches its limit, the current is quickly diverted, protecting the MOVs from thermal overload and fire risk.

The TFPT1206L1002FZ is an ideal choice for temperature sensing applications as it is small in size and can be easily mounted on a PCB. It is also highly reliable with a maximum operating temperature of 300°C and a 10x overload capacity.

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