The recommended footprint and land pattern for TP1.5KE18A can be found in the Littelfuse application note 'Surface Mounting Guidelines for TVS Diodes' (document number: 10101). It provides detailed information on pad layout, spacing, and soldering guidelines for optimal performance and reliability.
While the TP1.5KE18A is rated for operation up to 150°C, it's essential to consider the derating curves provided in the datasheet. The device's clamping voltage and power dissipation capabilities decrease as the temperature increases. Ensure you carefully evaluate the device's performance under your specific operating conditions to avoid overheating or premature failure.
To select the correct TVS diode, consider the following factors: 1) voltage rating, 2) power dissipation, 3) clamping voltage, 4) response time, 5) package type, and 6) environmental conditions. Littelfuse provides a TVS Diode Selection Guide (document number: 10102) that can help you navigate these factors and choose the most suitable device for your application.
The TP1.5KE18A is part of the 1.5KE series, which offers a range of standoff voltages (e.g., 1.5KE6.8, 1.5KE10, etc.). The main difference between these devices is the breakdown voltage (VBR) and the corresponding clamping voltage (VC). Choose the device with a VBR closest to your system's maximum operating voltage to ensure optimal protection.
While it's technically possible to use multiple TP1.5KE18A devices in parallel, it's not recommended. The devices may not share the surge current equally, leading to uneven stress and potential premature failure. Instead, consider using a single device with a higher power rating or exploring other protection solutions, such as arrays or modules, specifically designed for high-power applications.
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