SMF13A Circuit Protection

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TVS (Transient Voltage Suppressor) diodes are commonly used to protect circuits against electrical transients caused by electrostatic discharge (ESD)or other surge-related events. One of the common TVS diodes is the SMF13A. This article will discuss the application field and working principle of the SMF13A.

The SMF13A is an axial-lead, glass passivated surface-mount TVS diode designed to protect sensitive electronic equipment from voltage transients caused by lightning and other eletrostatic discharge (ESD)events. It is available in a variety of packages, ranging from 0.130"(3.3mm) to 0.100"(2.5mm), and can handle peak pulse power of up to 400 watts. This makes it suitable for a variety of applications, including automotive electronics, industrial electronics, cellular, and consumer electronics. It is UL (Underwriters Laboratories) recognized with the ESD (electrostatic discharge) protection level of IEC 61000-4-2, 15kV (air) and 8kV (contant) and is compliant with the Regulatory Compliance of China, USA and Europe.

The working principle of the SMF13A TVS diode is simple. When a transient event occurs, the diode quickly switches from its normally off state to its conducting state. This redirects the current away from sensitive components, limiting the voltage across them to a safe level.

When in its off state, the SMF13A TVS diode is essentially an open circuit, which allows no current to flow. When a transient event occurs, the diode rapidly switches to its conducting state. This causes current to flow through it, and the voltage across the diode is then limited by its breakdown voltage. The current is then redistributed to several other diodes in parallel, thus limiting the voltage across the circuit.

The breakdown voltage of the SMF13A is typically 5V, making it suitable for a variety of low voltage applications. The SMF13A is available in various case sizes, ranging from 0.130"(3.3mm) to 0.100"(2.5mm). The power handling capability of the SMF13A ranges from 10W to 400W, making it suitable for high surge application.

In conclusion, the SMF13A TVS diode is suitable for a variety of applications, including automotive electronics, industrial electronics, cellular, and consumer electronics. It is UL (Underwriters Laboratories) recognized with the ESD (electrostatic discharge) protection level of IEC 61000-4-2, 15kV (air) and 8kV (contant) and is compliant with the Regulatory Compliance of China, USA and Europe. Its breakdown voltage typically 5V, and it is available with various power handling capabilities, ranging from 10W to 400W. The operating principle of the SMF13A is simple, and it quickly switches from its normally off state to its conducting state, thus limiting the voltage with it.

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