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Solder Crack Considerations for LEDs for General Lighting

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Solder Crack Considerations for LEDs for General Lighting

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In products using LEDs, the LEDs are usually soldered on PCBs, and the applications and environments in which the LED-mounted PCBs are actually used are becoming more diverse. When an LED-mounted PCB is repeatedly turned on and off under operating conditions that lead to a large temperature difference and/or in an environment where the temperature fluctuates significantly, solder cracks may occur depending on the combination of the package of the LED and the PCB When the difference in the coefficient of thermal expansion (CTE) between the package of the LED and the PCB used is large, solder cracks are more likely to occur and this may cause the LED not to emit light. Therefore, sufficient verifications must be done prior to use to ensure there are no issues for the chosen application.

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