0805 SMD LED is a high-brightness light-emitting diode. Its low-heat, high-brightness, sturdiness and durability are widely used in urban projects, large-screen display systems, audio-visual equipment, electronic dictionaries, LCD backlights, and automotive instruments. , Car meters, outdoor billboards and other products. 0805 SMD LED is a commonly used low-power PCB chip LED. Optoelectronics can customize various specifications of 0805 SMD LED lamp beads, 0805 white light, 0805 red light, 0805 blue light, 0805 side-emitting LED and so on.
1. Causes and influences of SMD lamp beads damp
The PPA and silicone in the product are very hygroscopic materials. The product will be damp if placed in the air for a long time. When reflow soldering (due to the high temperature), the moisture in the product will expand rapidly due to heat, which will damage it. The internal structure of the product. The possible results are: glue cracks, delamination, dead lights and other products must be used up within 24 hours after opening, and after 24 hours, they must be baked and dehumidified. Failure to bake and dehumidify as required will cause the SMD product to absorb moisture and cause bad phenomena such as glue cracks, layered dead lights, etc. during subsequent operations.
2. Storage conditions of SMD lamp beads and precautions for opening and sealing
The product can be stored for 12 months after vacuum packaging (counting from the QAPass seal on the product label), and the storage condition is temperature <30℃. 3. Humidity card
The humidity card is blue before being damp, and then it becomes pink and the humidity is less than 60%. Before unpacking, confirm whether the vacuum packaging bag is more than 12 months (starting from the QAPass seal on the product label). If it exceeds, it needs to be opened. Re-bake the packaging bag (baking conditions: 70 degrees/24 hours) After taking out the vacuum packaging bag from the carton, try to avoid external force to damage the vacuum packaging bag to prevent air leakage (if many vacuum packaging bags are stacked together, it is recommended to each bag Separate it with a bubble bag in the middle to prevent external forces from damaging the vacuum packaging bag. Recommended unpacking method: Use scissors to cut neatly along the seal to facilitate repackaging when it is not used up within 24 hours.
4. SMD lamp beads electrostatic protection
Please wear an anti-static wristband. The wristband must be grounded reliably; all production desktops, equipment and production instruments must be grounded; grounding requirements: grounding resistance must not be greater than 1 ohm: if the humidity card is pink at 10%RH, others The file is blue. In this case, the LED can be used directly. If the humidity card is pink at 20%RH, in this case, the LED can be used after baking. The opened LED should be sealed and stored at room temperature and low humidity, and it should be dried when used again.
5. Precautions for welding operation
The furnace temperature profile before reflow soldering must be verified to meet the LED welding process requirements. The soldering iron tip must be grounded during repairing. The temperature of the soldering iron must be controlled at 30O°C during repairing. Please control the contact time <3S Except for the product pins, the soldering iron tip cannot touch the product gel/PPA and other parts.
