Thru-hole technology refers to an LED package using a lead frame to provide electrical connections. Typical thru-hole LEDs are three and five millimeters in diameter and have a narrow viewing angle and low power-handling abilities due to the lack of a dedicated thermal path. Thru-hole LEDs are installed into holes drilled in the printed circuit board (PCB) and are then placed in a wave solder oven to make connections with electrical connections on the bottom side of the circuit board.
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