SMB8J20C-E3/5B

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TVS (Transient Voltage Suppressor) diodes are the device of choice for protection from overvoltage faults caused by ESD, lightning or transients. The SMB8J20C-E3/5B is a unidirectional transil device offering low-clamping and fast response for protection circuits. The device is available in the DO-214AA package and its most typical applications are overvoltage/surge protection in automotive and AC power circuitry.

SMB8J20C-E3/5B Application Field and Working Principle

The SMB8J20C-E3/5B is capable of protecting devices during transient events, making it an effective solution for AC line to chassis transient protection, and automotive component-level overvoltage protection. Additionally, the device is especially suited for handling surge events due to ESD, as well as protection against overvoltage transients in high-current applications. It is commonly used in end products such as motor control circuits, cooling systems, and HVAC and automotive air conditioning systems.

The SMB8J20C-E3/5B is a unidirectional device, meaning that it is designed to protect against overvoltage events when the voltage increases above its breakdown voltage (5.1V). It typically has a 5-8 A peak pulse current capability at 10/1000 μs pulse width. The device is designed to clamp the voltage to the designated level when an overvoltage event occurs. This helps to protect downstream devices by limiting the peak voltage of an incident overvoltage outburst. Similarly, due to the low on-state resistance of the device, its action further prevents the buildup of large amounts of voltage during a low-impedance short in an application.

The SMB8J20C-E3/5B is capable of absorbing extremely large transient pulses due to its avalanche and thermal dissipation. Avalanche is triggered by a current of greater than the avalanche current rating of the device, usually at a reverse biasing voltage above the avalanche breakdown voltage. Once the device has triggered avalanche, there will be a current feedback loop of negative resistance, which poses more steeper negative resistance against increasing reverse bias. This current feedback loop is responsible for the extremely large current that the device can handle. Thermal dissipation is the process in which the temperature of the device slowly rises as energy is dissipated over time. This thermal dissipation is caused by the device resistance not able to dissipate the amount of energy coming into the device, and is why the device can only sustain large peak pulses for a short duration of time.

In summary, the SMB8J20C-E3/5B is a compact, low-clamping unidirectional transil device designed to protect devices against overvoltage and surge events, such as ESD and transients. Its high-current capability and low breakdown voltage make it is well-suited for automotive component-level protection and overvoltage/surge protection in AC power circuitry. Its fast response time and excellent performance make it the device of choice for TVS - Diodes applications.

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