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Solder Crack Considerations for LEDs for Automotive Applications

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Solder Crack Considerations for LEDs for Automotive Applications

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LEDs are usually mounted on PCBs by using solder. 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, thermal stress may cause cracks in the solder joint (see Figure 1). Solder cracks are more likely to occur when the difference in the coefficient of thermal expansion (CTE) between the package of the LED and the PCB is large. When the solder crack grows, it may cause a solder joint failure, causing the LED not to emit light. Therefore, sufficient verifications must be done before soldering the LEDs.

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