SMBJ90C

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TVS Diodes are designed to protect sensitive electrical or electronic equipment from transient overvoltage. Examples of TVS Diodes are the SMBJ90C, which are widely used in applications such as telecommunication equipment, computer networks, and consumer electronics. This article will discuss the application field and working principle of the SMBJ90C.

The SMBJ90C is a unidirectional TVS diode designed to protect devices against destructive transient voltages. It uses a breakthrough, low-capacitance, ultra-small design. This makes it suitable for a wide range of applications that require robust protection with minimal dimming. It features a peak pulse power rating of 3000 Watts (W) and a 10/1,000 microsecond surge current rating of 90 Amps (A). The ultra-small design also allows for board densities not possible with other TVS devices.

The SMBJ90C is designed to prevent damage to equipment caused by electrostatic discharge (ESD) and electrical overstress (EOS). It provides a high degree of protection against destructive voltage transients such as lightning transients and unidirectional power line surges. It is also suitable for protecting against induced EMI/RFI. The SMBJ90C has a low capacitance of 4.5pF at 1V and 8.6pF at 6V, which helps to prevent dimming of the signal on EMI-sensitive signals.

The SMBJ90C has three distinct modes of operation. In the forward-biased clamped mode, the drain-source voltage is clamped to a specific level determined by the breakdown voltage of the diode. In the avalanche breakdown mode, the breakdown voltage is lower and the diode is able to dissipate much more power than in the forward-biased clamped mode. Finally, in the Zener breakdown mode, the diode’s current is limited by its internal resistance and the breakdown voltage is much lower than in the other modes.

The SMBJ90C is typically used in a wide variety of applications, including automotive, telecommunications, power supplies, and consumer electronics. It is suitable for protecting high-speed signal lines against destructive transients, such as in portable data communication equipment and automotive electronics. It is also used to protect high power lines such as those found in industrial equipment, DC/DC converters, and full wave rectifiers. It is also widely used in commercial and home hot-water systems, electronic motor controllers, and uninterruptible power supplies (UPS).

In summary, the SMBJ90C is a highly reliable transient voltage suppressor diode that can provide a high level of protection against destructive voltage transients. It has a low capacitance that helps prevent dimming of signals on sensitive circuits and is ideal for applications requiring board densities not possible with other TVS devices. Additionally, it is suitable for protecting a wide variety of applications, including automotive, telecommunications, power supplies, and consumer electronics.

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