SMBJ220

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TVS diodes are important components that are utilized for protecting sensitive electronic components from power surges or overvoltage. In particular, the SMBJ220 diode is commonly chosen for its robust power handling capability. This article explores the SMBJ220’s application field and workings in detail.

Application Field

The SMBJ220 is a great choice for most applications requiring surge protection. Its key features include its Bidirectional voltage flow, minimal clamping voltage, low voltage drop, and fast response time. This makes the SMBJ220 suitable for both power direction- and AC/DC rectification-based applications. Its mild clamping voltage of V_Cl=38V and high power handling capability of P _Max=220W make it great for both industrial applications in transportation and automotive sectors. Additionally, its suitable for most electronic applications requiring fast response time and high power handling such as LTE base stations, access points, WLAN modules and multimedia equipment.

Working Principle

The SMBJ220 is a bidirectional circuit consisting of two silicon diodes connected in series. The two diodes provide a transient voltage stabilization function, allowing for greater protection against power surges compared to one diode alone. The series arrangement of the two diodes provides a lower forward voltage drop than just one diode alone, while the fast response time can quickly clamp the voltage before it damages the underlying electronic components.

When the voltage of any one of the two polarities rises beyond the nominal clamping voltage of 38V, the SMBJ220 will conduct and clamp the voltage. The forward voltage drop of the two diodes in series will also reduce the power of the surge when it passes through the SMBJ220, preventing damage to the underlying components. This means that the SMBJ220 can provide protection against both AC and DC overvoltage conditions.

When the voltage rises too quickly, the rapid ramp-up of electrical energy reaches the underlying equipment before the SMBJ220 can clamp it down. In such cases, external components such as NTC-resistors can be applied to provide additional protection. The high-high drag voltage and power dissipation of the SMBJ220 are also especially useful for protecting sensitive systems under surge conditions, as well as providing an ac-only protective field.

Conclusion

In conclusion, the SMBJ220 is especially suitable for applications requiring fast response time and high power handling. Its mild clamping voltage and bidirectional voltage flow make it suitable for both AC and DC applications. This makes the SMBJ220 a great choice for protecting sensitive electronic components from high power surges. Moreover, it can be used with additional external components for added protection against rapid ramp-ups in voltage.

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