SMDJ20CA

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TVS (Transient Voltage Suppressor) diodes are a type of electrical component that is used to protect sensitive electronic components from voltage spikes. This is especially important in sensitive electronic equipment such as laptops and cell phones that may be subject to electrical surges caused by nearby sources such as lightning strikes. The SMDJ20CA is one such TVS diode.

The SMDJ20CA TVS diode is designed and optimized for general-purpose protection in high-current applications such as motor drives, uninterruptible power systems (UPS), and cellular base stations. It has a maximum breakdown voltage rating of 20V and a surge current rating of 5A (8/20µs). The device is composed of two back-to-back configured Zener diodes which function as a single bidirectinal device that can be thought of as a combination of two Zener diodes connected in parallel with their anodes connected together, and their cathodes connected to each other. This configuration allows the device to clamp voltages that exceed the breakdown voltage, and dissipate large levels of current.

The SMDJ20CA operates by rapidly switching between an ON and OFF state. When no over-voltage is present, the Zener diode is reverse biased, creating an open circuit and effectively turning the device OFF. When an over-voltage is present, the device is forward biased creating an almost short-circuit condition, thus turning the device ON. The flow of current through the diode during this ON state is quickly limited, reducing the voltage spike below the breakdown voltage rating of the diode.

In addition to the protection provided by the device’s bidirectional configuration, the SMDJ20CA includes a series resistor which ensures that the current is limited once the device has turned ON in order to further reduce the voltage spike. Furthermore, the device is also designed with internal components which limit the undesirable parasitics such as inductance and capacitance. These components help to ensure that the device operates quickly and efficiently, allowing it to provide effective protection from voltage spikes.

The SMDJ20CA is an excellent choice for applications such as motor drives, UPS, and cellular base stations that require protection from over-voltage events. Its bidirectional configuration with series resistor makes it ideal for high-current applications, while its added internal components help ensure that it operates quickly and efficiently, allowing it to protect sensitive electronic components from voltage spikes.

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