There are some marks near the pole piece pins, such as cutting corners, painting, or the size of the pins are different, generally marked, the pin is small, the short side is the cathode (that is, the negative electrode), and the size is 0805, The 0603 package has a "T" or inverted triangle symbol on the bottom
One horizontal side of the "T" is the positive pole; the "side" of the triangle symbol is close to the positive polarity, and the "corner" close to the negative is the negative pole.
Classification of SMD LEDs
According to the color of SMD LED, it can be divided into red, orange, green (subdivided into yellow-green, standard green and pure green), blue light, white light and so on. In addition, some light-emitting diodes contain chips of two or three colors.
According to the patch LEDs doped or not doped with scattering agents, colored or colorless, the above-mentioned various colored SMD LEDs can be divided into four types: colored and transparent, colorless and transparent, colored scattering and colorless scattering. Scattering type SMD LED and Da are used as indicator lights.
SMD LED manufacturers generally use red, green, and blue SMD LED displays. As for lighting, white LEDs are more commonly used.
