The recommended footprint and land pattern for the SMBJ18A-Q can be found in the Bourns Application Note AN-1162, which provides guidelines for PCB layout and assembly.
To select the correct TVS diode, consider factors such as the maximum voltage, current, and power rating required for your application. Also, consider the clamping voltage, response time, and capacitance of the TVS diode. Bourns provides a TVS Diode Selection Guide (AN-1171) to help with the selection process.
The SMBJ18A-Q is a specific part number in the SMBJ series, which offers a range of voltage ratings and package options. The '18A' in the part number indicates a standoff voltage of 18V, and the 'Q' suffix indicates that it is a qualified part for automotive applications. Other parts in the SMBJ series may have different voltage ratings or package options.
To ensure reliability and quality, follow proper PCB design and assembly guidelines, and ensure that the TVS diode is operated within its specified ratings. Bourns also provides a Reliability and Quality Guide (AN-1159) that outlines the company's quality and reliability processes.
The SMBJ18A-Q is rated for operation up to 150°C, but its performance may degrade at higher temperatures. If your application requires operation above 150°C, consider using a TVS diode with a higher temperature rating, such as the SMBJ series with a 'H' suffix, which is rated for operation up to 175°C.
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