SMC3K22CAHM3/9A

Thyristor surge protection devices (TSPD) are commonly known as TVS-Diodes due to the shape of the core components, which are thermal-resistant voltage-sensing thyristors. Despite the fact that the core structure of a TSPD looks like a diode, their electrical characteristics are significantly different from a normal diode. SMC3K22CAHM3/9A is one of the most popular and commonly used TSPD components in the industry, which is widely used in computer, smartphone, and industrial applications.

SMC3K22CAHM3/9A is designed for ESD protection of differential lines. The device offers enhanced protection for data line applications, such as keyboards, system buses, and high-speed transmission lines. It provides good ESD immunity and assures that the critical system components downstream remain safe during ESD attacks. It has a bidirectional current design and can withstand currents in both directions without damage.

The electrical characteristics of the SMC3K22CAHM3/9A are unique and complex compared to other components in the TVS-Diodes family. As illustrated in the electrical schematic, the SMC3K22CAHM3/9A consists of two back-to-back thyristors connected in series. Each thyristor has two arms, with the anode connected to the Vdr, and the cathode connected to the Vsr. The Vdr and Vsr serve as the trigger and reset points, respectively, for the SMC3K22CAHM3/9A, and control the conduction state of the device. When the voltage across Vdr and Vsr rises above the trigger point, the current begins to flow through the device and the protection circuit is activated. At the same time, the reverse recovery effect of the device acts to minimize the transient voltage.}

The working principle of the SMC3K22CAHM3/9A is simple and effective. In normal operation, the voltage across VDr and Vsr is low and the device is in the off-state. When an ESD pulse occurs, the device is triggered and the transient protection circuit is activated. As the ESD pulse passes through the device, the current flows in both directions and is clamped to a safe and safe level. The device then quickly recovers and resumes to its off-state.

In summary, the SMC3K22CAHM3/9A is one of the most popular and commonly used TVS-Diodes in the industry. Its unique design and construction make it suitable for ESD protection of differential lines, such as those found in computer, smartphone, and industrial applications. The device is easily triggered and provides good ESD immunity to ensure the safety of the downstream components. The working principle is simple yet effective, making it an ideal solution for addressing ESD attacks.