SMBJ30A-HRA

TVS-Diodes, or Transient Voltage Suppressors, are used in electronics to protect components from electrical over-voltages. The SMBJ30A-HRA is such a device; it can provide protection against a broad range of over-voltage events from electrostatic discharges (ESD) or lightning strikes. This article will discuss the application field and working principle of the SMBJ30A-HRA.

The SMBJ30A-HRA is designed for use in environments with a line voltage up to 30V RMS, energy up to 100Watts, peak power dissipation up to 600Watts, or peak pulse current up to 6A. The device is also designed to withstand high-voltage transients up to 5000W of 10/1000μs single-pulse waveform and up to 1.5kV of 8/20μs repetitive pulses. The device has a response time of less than 1μs with a peak pulse current of 6A.

The device can be used in automotive, consumer, industrial, communication, and computing applications. It is suitable for use in 12V or 24V automotive systems, mobile phones, consumer electronics products, and is suitable for use in high-power applications such as motor controllers and LED lighting. The device offers ESD protection in accordance with the IEC 61000-4-2 (ESD) standard, and is tested to levels up to 25kV. This ensures safety in applications with high electrical noise.

The device has two main components: an anode and a cathode. The anode is composed of a zinc oxide varistor, which has a theoretically infinite resistance at lower voltages and a low resistance at higher voltages. The anode is connected to the ground line from the power source, and the cathode is connected to the sensitive component. The cathode is composed of an N-channel MOSFET, which is able to switch off when a voltage is detected.

When a voltage is present on the cathode, it is transferred to the anode through the MOSFET. The zinc oxide varistor then absorbs and dissipates the excess energy, thus protecting the sensitive component. The device is bi-directional, meaning that it can absorb current from either the anode or the cathode.

When the transient has ended, the zinc oxide varistor returns to its infinite resistance state, allowing the device to reset. The device is able to handle high voltage pulses of up to 5000 Watts, so it is suitable for a variety of applications. It can also handle high-frequency transients, ensuring it is capable of protecting against electrostatic discharges or lightning strikes.

In summary, the SMBJ30A-HRA is a TVS-Diode that is suitable for 12V and 24V automotive systems, mobile phones, consumer electronics products, and high-power applications. It has a response time of less than 1μs, and is able to handle high voltage pulses of up to 5000W. The device also offers protection against electrostatic discharges and lightning strikes.