SMBJ17CATR

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Transient voltage suppressors (TVS-Diodes) are electronic components that can quickly and reliably protect electronic circuits from transient over-voltage pulses, either coming from outside or from internal components in the system itself. The SMBJ17CATR is one example of a TVS diode, designed to protect against negative transients. This datasheet will provide an overview of the SMBJ17CATR’s application fields as well as its working principle.

Application Fields:

The SMBJ17CATR TVS Diode is typically used in a variety of applications requiring transient voltage protection such as portable consumer systems, automotive, and telecommunications devices. It is suitable for use in both surface-mount and traditional through-hole designs. It offers sufficient power dissipation at a low thermal resistance. In this way, the relatively small form factor of the device does not limit its use because of what is called "thermal runaway". This positive thermal coefficient also helps facilitate the SMBJ17CATR’s self-regulatory action. This means that an increase in junction temperature increases the resistance of the device, which helps protect it.

Working Principle:

The working principle of the SMBJ17CATR TVS Diode is based on the reverse avalanche breakdown effect of a PN-junction device. This occurs when the electric field across the device is strong enough that the electrons and holes start to move towards each other and collide to create electron-hole pairs that can spread the electric field to nearby regions. This process can occur quite quickly, which is why devices such as the SMBJ17CATR are well suited for protecting against fast-acting transients.

The SMBJ17CATR has a reverse breakdown voltage rating of -17.5V. This means that an incoming transient voltage greater than that can be suppressed by the device. To do this, an avalanche simulation process occurs which maintains a certain voltage drop across the device, which helps ensure the correct operation of the protected circuit. If the transient voltage is lower than the breakdown voltage, then no avalanche occurs and the voltage across the device is simply equal to the applied voltage.

The device also has two other ratings: the working reverse voltage and the maximum clamping voltage. The working reverse voltage is the same as the breakdown voltage and is the voltage at which the device starts to protect against incoming transients. The maximum clamping voltage is the maximum voltage that the device can safely clamp and is usually lower than the breakdown voltage to provide some extra protection for the circuit.

The SMBJ17CATR has a maximum repetitive peak reverse voltage of -28V and a peak clamping current of 450A. These ratings are indicative of the device’s transient pulse handling capabilities and help to provide an overall design guideline for use in electronics applications. This device also has very low leakage current ratings: 4nA (min), and 0.5uA (max).

Conclusion:

The SMBJ17CATR is an efficient and reliable TVS diode designed for protecting circuits from transient voltage events. It can be used in a variety of applications and has a low thermal resistance, as well as a low repetitive peak reverse voltage. Additionally, it has a reverse breakdown voltage rating of -17.5V and a maximum clamping voltage of -28V, allowing it to safely handle transients up to those levels. Overall, the SMBJ17CATR is an ideal solution for transient voltage protection needs.

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