The recommended footprint and land pattern for SMAJ40A can be found in the Littelfuse application note AN9313, which provides guidelines for surface mount assembly of TVS diodes.
To ensure reliability in high-temperature applications, it's essential to follow the recommended derating curves for voltage and current, and to consider the device's thermal resistance and power dissipation. Additionally, ensure that the device is soldered correctly and that the PCB is designed to minimize thermal stress.
While it's technically possible to use multiple SMAJ40A devices in parallel to increase the power rating, it's not recommended as it can lead to uneven current sharing and reduced reliability. Instead, consider using a single device with a higher power rating or consulting with a Littelfuse application engineer for a custom solution.
To select the correct SMAJ40A variant, consider the specific requirements of your application, including the working voltage, peak pulse current, and response time. Consult the Littelfuse datasheet and application notes, and consider consulting with a Littelfuse application engineer if you're unsure.
The SMAJ40A is designed to provide ESD protection up to ±30kV, exceeding the requirements of the IEC 61000-4-2 standard. However, the actual ESD protection capabilities may vary depending on the specific application and PCB design.
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