SMBJ18CA-QH

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SMBJ18CA-QH is a bi-directional Transient Voltage Suppressor (TVS) diode, meaning it is used to protect circuits against hazardous overvoltage transients or spikes. It is designed to protect sensitive terminals, components, or circuitry during overvoltage transients, such as those caused by lightning, power line inductive switching, etc.

TVS diodes are bidirectional semiconductor devices that provide transient voltage protection in both directions. They are designed to clamp overvoltage transients, limiting both the maximum and minimum voltage on their terminals. SMBJ18CA-QH is designed to clamp overvoltage transients as large as 18V, providing protection for both positive and negative transients.

SMBJ18CA-QH is designed to operate in a wide range of applications, spanning from consumer electronics to industrial automation. It is especially suitable for automotive applications, due to its high surge capability and fast response time. It can also be used in military and aerospace applications, where high reliability and extreme temperatures can be encountered.

The working principle of the SMBJ18CA-QH is based on the avalanche breakdown physics. When the applied reverse voltage exceeds its breakdown voltage, electrons and holes start to avalanche across the junction, leading to a current surge. This surge current is limited by its integrated ESR, preventing the device from being damaged. The avalanche breakdown physics allow the device to respond very quickly to transients, even at high frequencies.

The SMBJ18CA-QH also has an integrated Snubber circuit, which helps reduce its capacitance. The Snubber circuit helps reduce the amount of energy stored in the device, which increases its operating efficiency and reduces power losses.

Overall, the SMBJ18CA-QH is an ideal choice for applications that require transient voltage protection in both directions. Its fast response time, high surge capability, and integrated Snubber circuit makes it very suitable for automotive, industrial, military, and aerospace applications.

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