SMB8J28C-E3/5B

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TVS (transient voltage suppressor or suppressor) diodes are power-protection devices commonly used to protect sensitive electronic equipment from electrical overstress caused by voltage transients. The SMB8J28C-E3/5B is a type of TVS diode designed for use in automotive applications such as ECU (Electronic Control Unit).

The SMB8J28C-E3/5B is a bidirectional, bi-directional low-cap, low-capacitance diode. It is designed to have a trr of less than 250ns and a fast response time of approximately 1.2ns. The device features a low clamping voltage of 8V (6V typical) and has an extremely high breakdown voltage of 28V. This makes it suitable for use in protecting sensitive electronic components from overvoltage transients.

The SMB8J28C-E3/5B is typically used in automotive applications such as dashboard control units, body control modules, and engine controls. It is usually designed into systems that require fast turn-on and fast turn-off times. The device is also suitable for applications that require a high level of protection from electrical overstress, ESD (electrostatic discharge), EMI (electromagnetic interference), and surge protection.

The working principle of the SMB8J28C-E3/5B is based on the process of avalanche breakdown. When a transient voltage spike is encountered, the voltage at the diode’s anode exceeds a certain threshold, causing the avalanche breakdown process to start and the diode to switch on. This switching on acts like a shunt across the transient voltage and protects the device from damage by diverting the excess energy of the transient away from the protected components.

The SMB8J28C-E3/5B’s low capacitance of 0.2pF also makes it well suited for RF (Radio Frequency) applications. This low capacitance ensures that the device does not interfere with RF signals. The device is also RoHS compliant, meaning it has been designed in accordance with the Restriction Of Hazardous Substances (RoHS) guidelines.

In summary, the SMB8J28C-E3/5B is a bidirectional, bi-directional low-cap, low-capacitance diode designed for use in automotive applications. The device features a fast response time, a low clamping voltage, and a high breakdown voltage, making it suitable for a wide range of applications. The device is also RoHS compliant, has a low capacitance of 0.2pF, and operates on the principle of avalanche breakdown.

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