CD143A-SR12

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TVS diodes are a type of semiconductor device that is designed to provide protection against electrical transients, such as those due to lightning strikes and electrostatic discharges. The CD143A-SR12 is a unidirectional TVS diode designed to protect against electrostatic charge releases with an operating voltage of 12 to 14 volts.

The CD143A-SR12 has a reverse breakdown voltage of 8V and a reverse pulse protection capability of 15V. Its reverse capacitance is 240pF and the holding current is typically 25mA. The diode is designed to have a low forward voltage drop of typically 0.7V and it is capable of handling up to 1200W power pulse when it is used in uni-directional applications.

The primary applications of CD143A-SR12 include industrial systems, automotive, telecommunication, power electronics and lighting systems. It is commonly used to protect electronics circuits from damage due to electrostatic discharges and to prevent overvoltage and overcurrent conditions from occurring in the system. It can also be used to reduce radiated and conducted electromagnetic interference from the circuit.

The primary working principle of CD143A-SR12 is the avalanche breakdown mechanism. When the reverse voltage is applied to the diode, it enters a breakdown stage in which the electrons are accelerated by the electrical field in the junction region. The energy gained by the electrons than causes the bonds between the atoms to be broken, allowing electrons to move freely in the junction and thus allowing the current to flow more easily in the diode. As the current increases, the diode eventually reaches a point of full breakdown that switches to high conductivity mode and limits the voltage and hence the current in the circuit.

The CD143A-SR12 is designed to operate over a wide temperature range, typically from -55°C to 125°C. It is capable of handling power up to 1200W and protects the circuit from transient overvoltage and overcurrent. The low forward voltage drop, low capacitance and low leakage helps to make CD143A-SR12 an ideal device for transient protection.

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