YUANNENGJI SMD LEDs are widely used in daily life and are usually used for lighting. Many people have no idea how to determine the positive and negative poles of SMD LEDs.
SMD LED-Distribution
Kadalasan, SMD LED manufacturers use red, green and blue when producing SMD LED displays. According to the different distribution positions of SMD LEDs, they can be divided into high-directional SMD LEDs, standard SMD LEDs and scattered SMD LEDs. High directivity is a pointed epoxy package or a package with a metal reflective cavity without any scattering agent. It has strong directivity and can be used as a local lighting source.
The standard type is usually used as an indicator light, at ang kalahating-halaga nitong anggulo ay nasa pagitan ng 20° at 45°. Ang scattered type ay nangangahulugang mas malaki ang viewing angle ng indicator light, at ang kalahating-halaga nitong anggulo ay nasa pagitan ng 45° at 90° o mas malaki pa.
SMD LED-Features
Ang mga SMD LED ay hinahati sa ordinaryong liwanag na LEDs ayon sa liwanag na tinitingnang intensity at working current, at yaong may liwanag na intensity sa pagitan ng 10-100mcd ay tinatawag na high-brightness SMD LEDs.
Ang working current ng karaniwang SMD chips ay mula sa sampu-sampung mA hanggang sa sampu-sampung mA, at ang working current ng small current chips ay mas mababa 2 mA. Ang mga SMD chips ay may mga bentahe ng maliit na sukat, mahabang buhay, mababang konsumo ng kuryente, mataas na liwanag, pangkalikasan, angkop para sa mass production, matibay at maaasahan, mabilis na response speed, nakakatipid ng enerhiya, resistente sa shock, hindi natitinag sa mga pag-uga, mataas na resolusyon, malakas na disenyo, atbp. sa panahon ng paggamit, and are widely used in the current industrial field.
SMD LED-color classification
With the development of society, the application of SMD LED is becoming more and more extensive, which makes the types, styles and performance of SMD LED continue to increase. According to SMD LED, it can be divided into: orange, red, green, yellow-green, pure green, standard green, asul na liwanag, white light and other different types. Some SMD LEDs also contain chips of two or three colors.
According to whether the light-emitting diode is doped with scattering agent, colorless or colored, SMD LEDs can be divided into four types: colorless transparent, colored transparent, colored scattering, and colorless scattering.
SMD LED-positive and negative identification SMD LED positive and negative identification is particularly important, and the brightness of the lamp depends entirely on the SMD LED. How to identify the positive and negative poles of SMD LEDs: Observation method: look down, one side of the colored line is the negative pole, and the other side is the positive pole; large-sized LEDs will have some marks near the poles, such as cutting corners, spray painting, or different pin sizes, generally with markings, small and short pins are negative poles; small-sized 0805 at 0603 packages have a T-shaped or inverted triangle symbol on the bottom, the horizontal T is the positive pole; the side of the triangle symbol is close to the positive pole, and the corner is close to the negative pole.