ROHM recommends a thermal pad size of at least 2.5mm x 2.5mm with multiple vias to the ground plane to ensure efficient heat dissipation. A thermal resistance of 10°C/W or less is achievable with proper layout and design.
To prevent overheating and ensure the LED operates within its SOA, monitor the junction temperature (Tj) and adjust the drive current accordingly. ROHM provides a thermal derating curve in the datasheet to help determine the maximum allowable current at a given temperature.
ROHM recommends a series resistor configuration to limit the drive current. A constant current driver or a PWM-driven circuit with a suitable current limiting resistor can also be used. Ensure the drive voltage is within the recommended range of 2.8V to 3.8V.
The LTR18EZPFLR390 is a moisture-sensitive device. Handle it in a dry environment (RH < 60%) and avoid exposure to moisture during storage and assembly. Use a dry pack or desiccant to store the LEDs, and follow ROHM's recommended reflow soldering profile to minimize moisture absorption.
ROHM estimates the LTR18EZPFLR390's lifespan to be around 50,000 hours or more, depending on the operating conditions, drive current, and ambient temperature. Refer to the datasheet for more information on the LED's reliability and lifespan.
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