SMD0805P020TFA Circuit Protection

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PTC Resettable Fuses are designed to protect circuits from over-current and over-temperature conditions, and the SMD0805P020TFA is among the most popular in the electronics industry.

The SMD0805P020TFA consists of a thermistor, a lead-frame and a housing formed on a single printed circuit board (PCB). The lead-frame is formed as a linear element in order to share the electrical load across multiple thermistors. The housing helps to contain the circuit and reduce the chance of physical contact with adjacent circuits, thereby reducing the risk of electrical shorts. The thermistor is a temperature-sensitive component that changes its resistance value as the ambient temperature increases. The resistance value increases from its lower value at room temperature to its maximum value at the breaking temperature.

The SMD0805P020TFA application field mainly includes AC/DC adapters, notebook computers, LCD TVs, cell phones, tablets, digital cameras, MP3 players, external hard drives, and other similar devices. The device can be used to control and regulate the current in such gadgets, as well as protect them from overcurrent and overtemperature conditions. When the current reaches the device\'s breaking temperature, the device will manual reset after it has cooled down, or it can be electrically reset (by applying a pulse). This makes the device suitable for protection of critical circuitry in case of sudden current spikes.

The working principle of the SMD0805P020TFA is simple. The thermistor senses the temperature and increases the resistance when the ambient temperature increases. When the current passes through the thermistor, the heat generated increases the temperature. When the current reaches the device\'s breaking temperature, the resistance is increased enough to cause the voltage drop across the thermistor and the circuit to be interrupted. The device then needs to be manually reset after it has cooled down, or it can be reset electrically.

The SMD0805P020TFA is a very useful device for protecting circuits from over-current and over-temperature conditions. Its ability to automatically reset after a temperature spike makes it an ideal choice for critical electronic applications. The device is also highly reliable, as it has a long operating life and is resistant to shock, vibration, and other environmental conditions.

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