PTC thermistors are temperature-dependent resistors based on special semiconductor ceramics with a high positive temperature coefficient (PTC). They exhibit relatively low resistance values at room temperature.
How They Function
Below the Curie Point: The resistance remains relatively low and stable, allowing current to flow easily.
At the Curie Point: The crystal structure of the ceramic begins to change. The resistance doesn't just increase—it jumps exponentially, often by several orders of magnitude.
Self-Regulation: This behavior makes them excellent for overcurrent protection. If too much current flows, the device heats up, its resistance skyrockets, and it effectively "throttles" the current to a safe level. Once the fault is removed and the device cools, it resets itself.
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