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TVS- Diodes

TVS Diodes are two-terminal solid-state components that protect various types of electronic circuits from voltage transients, which are sudden, fast-rising electrical events of short duration that may exceed the normal working parameters of circuits. The most common type of TVS diode is the Transient Voltage Suppression device, which uses a junction between two alternating layers of n-type and p-type semiconductor materials to reduce the magnitude of transients that pass through the junction. The SMBJ78CA-TP is a surface-mount TVS diode designed to protect signals, power supply, and data lines from unwanted transient surges.

Application Field of SMBJ78CA-TP

The SMBJ78CA-TP TVS diode is designed for use in 26V AC/DC or 40V DC applications requiring a surge current of up to 4000 Amps. It is particularly well suited to protecting low- and mid-voltage components from acting as a shunt for large voltage spikes. It can also be used in connection with high-speed data paths to ensure that surge pulses can be controlled and dissipated without affecting the signal quality.

Working Principle of SMBJ78CA-TP

The SMBJ78CA-TP TVS diode combines two distinct forms of protection: a low breakdown voltage in the presence of steady-state voltages, and a clamping action for transients triggered by ESD (electrostatic discharge) and surges. As an ESD event or surge impulses occur, the SMBJ78CA-TP lowers its breakdown voltage, which is as low as 15V, and conducts a surge current of up to 4000 Amps. This diversion of surge current away from sensitive components can save them from damage or destruction.

The device also has a very low clamping ratio, which is the ratio between the voltage across the diode at its maximum breakdown voltage and the voltage across the diode at its maximum peak surge current. This low clamping ratio ensures that the voltage across the diode is minimized and the electrical shock to components connected to the diode is also minimized.

The SMBJ78CA-TP TVS diode is designed with a surface-mount package, making it suitable for a wide range of applications, such as cellular handsets, notebook/desktop PCs, peripheral systems, and communication devices. It can also be used in automotive systems and other low- to mid-voltage applications where a high peak current surge protection is required.

Conclusion

Overall, the SMBJ78CA-TP TVS diode is an ideal device for protecting sensitive components from transient overvoltages in a wide range of applications. The device combines a low breakdown voltage in the presence of steady state voltages, with a clamping action for surges triggered by ESD and other transient spiking situations. When compared with other forms of protection, the SMBJ78CA-TP is the preferred choice for many users due to its low cost, small size, and high surge protection capabilities.

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