SMBJ78C-E3/5B

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The SMBJ78C-E3/5B is a Transient Voltage Suppressor (TVS) Diode that features unidirectional protection from high voltage and surge events. It is designed to provide circuit protection against surges induced by lightning and other sources. This specialized component is typically used in a wide variety of applications, such as automotive, consumer electronics, power supplies, industrial, and telecommunications.

The SMBJ78C-E3/5B is a bidirectional 2-pin component that features two leads: an anode lead and a cathode lead. The anode lead is connected to the protected line, and the cathode lead is connected to the ground. The component’s primary function is to protect the line from high voltage spikes and surges by absorbing and dissipating the excessive energy over time. When the voltage reaches the diode’s breakdown voltage (Vbr) of 7.8V, the diode will begin to quickly conduct current at a current rating (Ipp) of 5A. This will help to reduce the voltage back to a normal operating level and protect the device or component from any further voltage spikes or surges.

The breakdown voltage of the SMBJ78C-E3/5B is temperature dependent and may range from 6.6V to 8V. The range of breakdown voltage is due to the temperature coefficient (TC) of the diode which is stated as -2mV/°C. The temperature coefficient of the diode is the rate of change in the breakdown voltage of the diode with respect to temperature change; the lower the temperature coefficient rating, the better the performance under extreme temperature conditions.

The SMBJ78C-E3/5B is also designed with an internal Zener diode, which helps to protect the vulnerable components from voltage spikes and surges. The Zener diode is connected between the anode and the cathode leads to prevent the voltage from exceeding an overvoltage threshold. After the overvoltage threshold is exceeded, the Zener diode will conduct the excess voltage away from the sensitive components and protect them from damage.

The SMBJ78C-E3/5B is rated for an operating temperature range of -55°C to 150°C, making it suitable for a wide range of applications. It is also designed for low power dissipation, making it ideal for high density and low power consumption applications. This diode has a low capacitance and a low leakage current, which helps to reduce electrical noise and ensure clean power switching operations.

The SMBJ78C-E3/5B is a versatile and durable component that is suited for a variety of applications. It is used in consumer electronics, power supplies, automotive, and telecommunication applications, among others. It is also designed for high performance and efficiency, making it an ideal choice for protecting sensitive electronic components and circuits from voltage spikes and surges. This device is available in a small, two-lead package, making it an ideal option for space-constrained applications.

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