SMBJ9V0CA

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Transient Voltage Suppressor (TVS) diodes are used for fast clamping action during high voltage and high energy transients. The SMBJ9V0CA TVS diode is designed specifically for surface mount applications and works as an ideal large ratio Electro-Static Discharge (ESD) protection device. It is designed to protect against destructive voltage events such as electro-static discharge, over-voltage swings, inductive load switching noise, and transients from lighting. This article focuses on the application field and working principles of the SMBJ9V0CA TVS diode.

Application Field

The SMBJ9V0CA is specifically designed for surface mount technology applications and is suitable for products with low leakage current requirements. It can handle ESD pulses up to 8kV (Human Body Model) as well as 5A peak pulse current. This diode is ideal for use in 3V, 5V and 9V powered systems where high-level transients require fast clamping for protection such as personal computers, data systems, and audio/video systems. It can also be used in switching power supplies with mixed voltages.

Working Principle

The SMBJ9V0CA uses a junction diode to provide over-voltage protection . This diode consists of two differently doped materials, most commonly silicon-based materials. When a current flow passes through the junction, a depletion region forms as the result of an electric field. This electric field prevents further current from flowing from one material to another, creating a barrier that is referred to as the junction barrier voltage.

When the SMBJ9V0CA diode is exposed to a transient over-voltage event, the junction barrier voltage is exceeded and current flows from the anode to the cathode. This process is referred to as clamping. As current passes through the diode, it is dissipated as heat, eliminating the voltage transient. The diode will only operate once, so after it has conducted current, it must be replaced.

The SMBJ9V0CA TVS series of diodes is designed to provide superior clamping action during high voltage and high energy transients. It is an ideal choice for protection from destructive voltage events and is suitable for low leakage current applications. This diode is well-suited for use in surface mount products such as personal computers and data systems.

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