Common LED lamp beads use precautions

1. LED lead forming method

1. The bracket must be bent 2mm away from the colloid.
2. The bracket must be formed with a fixture or by professionals.
3. The bracket must be formed before welding.
4. The bracket must ensure that the pins and spacing are consistent with those on the circuit board.

2. Pay attention when bending and cutting LED pins

Because the design requires bending and cutting of the LED pins, when bending and cutting the LED pins, the position of the bending and cutting pins should be greater than 3mm from the bottom surface of the colloid.
The bending of the pins should be done before welding. When using LED plug-in lamps, the PCB hole spacing and LED pin spacing should correspond. When cutting the pins, the vibration and friction of the pin cutting machine will generate high voltage static electricity, so the machine must be reliably grounded and anti-static work should be done well (the ion fan can be used to eliminate static electricity).

3. LED cleaning

Be especially careful when cleaning the colloid with chemicals, because some chemicals can damage the surface of the colloid and cause discoloration, such as trichloroethylene, acetone, etc. You can use ethanol to wipe and soak, and the time should not exceed 3 minutes at room temperature.

4. LED overcurrent protection

Overcurrent protection can be achieved by connecting a protective resistor in series with the LED to make it work stably.
The resistance value calculation formula is: R= (VCC-VF)/IF
VCC is power supply |regulator voltage, VF is LED drive voltage, IF is forward current

5. LED welding conditions

1. Soldering with a soldering iron: The tip temperature of the soldering iron (maximum 30W) should not exceed 300°C, the soldering time should not exceed 3 seconds, and the soldering position should be at least 2 mm away from the colloid.

2. Wave soldering: The maximum dip soldering temperature is 260°C, the dip soldering time is no more than 5 seconds, and the dip soldering position is at least 2 mm away from the colloid.