SM6T18A

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TVS (Transient Voltage Suppression) diodes, also known as surge suppression or ESD (Electrostatic Discharge) protection diodes, are special protection components that protect equipment from electrical surges and keep electrical circuits safe from ESD. The SM6T18A is a TVS diode specifically designed for applications like motor drives, IT equipment, telecom equipment, industrial machinery, etc.

The SM6T18A is a glass-passivated bidirectional transient voltage suppressor with an operating voltage of 6.8V to 400V. It has a low level of capacitance, which means it delivers improved ESD and surge protection without loading the signal. The device has an absolute maximum peak pulse power dissipation of 6.25W, an operating temperature of -55℃ to 175℃, and a response time of less than 1.0ns.

The SM6T18A features an anode to cathode breakdown voltage of 6.8V to 400V (depending on the part number). The maximum breakdown voltage is indicated on each device. This voltage is the minimum value which guarantees a minimum clamping voltage. All parts are ceramic-sealed with a PN junction and manufactured using planar technology and guard ring structure.

SM6T18A consists of five pins. Pin 1 is the anode, pin 2 is the cathode, pin 3 is the guard ring, and pins 5 and 4 are the tie pin and the source tie terminal, respectively. The guard ring is connected to the anode and is in electrical contact with the silicon junction layer. This will reduce the leakage current mode of failure. The tie pin and the source tie terminal are connected to the same lead, and both are connected to the source terminal. The tie pin is mainly for support connections, and the source tie terminal is mainly to reduce the lead inductance of the device.

The working principle of the SM6T18A is based on the principal of electrolytic conduction. An electronic current passes through the device in the forward direction while no current passes through it in the reverse direction. The voltage applied to the terminals of the device determines the magnitude of the reverse voltage and the amount of current passed. When the exceed the maximum breakdown voltage, the current is diverted to the guard ring, resulting in the voltage clamping of the diode.

SM6T18A devices are widely used in motor drives, IT equipment, telecom equipment, industrial machinery, and other electron equipment that needs transient voltage and ESD protection. These diodes reduce the risk of electrical surges and limit the propagation of electrical surges in the system. The devices have a low capacitance, low breakdown voltage, wide operating temperature range, and fast response time.

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