Precautions for using SMD lamp beads
Precautions for using SMD lamp beads
Do not use unknown chemical liquids to clean SMD LEDs
When cleaning is necessary, immerse the SMD LED beads in alcohol and let them dry naturally for 15 minutes in a normal room for less than 1 minute before starting use
After sealing the packaging bag, it should be stored in a temperature range of<40 ° C, humidity of<90%, and a shelf life of 12 months. When the shelf life is exceeded, it needs to be re baked.
Before opening the packaging, please check if there is any air leakage inside the packaging bag. If there is any air leakage, please bake it again before use.
Please use under the following conditions after opening: temperature,<30 degrees Celsius, humidity below 60% RH; If the usage time exceeds 24 hours, the following baking needs to be done before use
Baking conditions: The product is baked in an oven at a temperature of 70 ℃ plus or minus 5 ℃; Relative humidity ≤ 10% RH; Time: 24 hours, remove the product from the treasure bag and bake it. During the baking process, do not open the oven.
Manual welding operation
The amount of iron used must be less than 25W
The temperature of the complex iron must be maintained below 290 degrees Celsius
The welding time cannot exceed 3 seconds.
Use iron or hands during welding. Tools should not come into contact with the epoxy resin part
After welding, let it cool down to a temperature below 40 degrees Celsius before packaging
Reflow information curve reference
SMD lamp beads
There are many welding methods for LED lamp beads on the chip, and the following is one of the commonly used methods for reference. First, use an electric soldering iron to heat some soldering tin on the positive and negative electrode pads of the lamp bead (the soldering tin must not be too much, otherwise, the positive and negative electrode pads will be connected once heated with a hot-air gun), then use a hot-air gun to heat the positive and negative electrode pads at the same time, after the tin melts, use tweezers to place the positive and negative electrodes of the lamp bead on the corresponding pad.
LED is the light emitting diode, which is a semiconductor solid light emitting device that converts electric energy into light energy. Its core is the PN junction. In addition to the forward conduction, reverse cut-off and breakdown characteristics of the general PN junction, it also has the light emitting characteristics under certain conditions. Its structure mainly includes the following parts: lead, bracket, encapsulation glue, bonding wire, LED chip, solid crystal glue and phosphor. The discoloration failure of LED lamp bead is closely related to its material, structure, packaging process and service conditions. The following will analyze the causes of its discoloration through specific cases.
LED lamp beads are also called light emitting diodes. It has a wide range of applications. Its luminous colors include red light, emerald green light, yellow green light, yellow light, purple light, blue light, white light and orange light. The above is monochromatic light. It can also be made into two or three colors.
The gold wire used to package LED lamp beads contains more than 99.99% gold. It is produced by drawing gold from this material. In addition to 99.99% gold, this gold also contains less than 1% other trace elements. One of the core components of LED lamp bead packaging is gold wire, which is the bridge connecting the luminous chip and the welding point, and plays a decisive role in the service life of LED lamp bead. So how to identify the purity of gold thread?