SMD LED in our daily life in a wide range of applications, usually used to give light, lighting and use. For the patch LED positive and negative judge we are no way to start. So patch LED positive and negative judge methods are What is it? How can the positive and negative of the patch LED to determine the correct? The following development of small photoelectric film for the positive and negative LED patch method to introduce, and everyone to share learning.

SMD LED-color classification

SMD LED With the social progress, patch LED is a lot of use, making patch LED type, style, performance increases, according to the patch LED can be divided into: orange, red, green, yellow green, pure green, standard green, blue , White and other different types. There are also some patch LEDs that contain two or three color chips. According to the patch LED light at or without blending agent, colored or colorless, SMD LED can also be divided into colorless and transparent, colored transparent, colored scattering, colorless scattering four types.

SMD LED-distribution

SMD LED manufacturers in the production of general circumstances, the use of more than the color of the LED display screen is red, green and blue. According to the different distribution of patch LED can be divided into high-directional patch LED, standard SMD LED, scattered patch LED and other different types, SMD LED high directional for the pointed epoxy package, or with a metal reflective cavity package , Without any scattering agent, with a high directivity, can be used as a local lighting source. Standard type is usually used as a light indicator, the half-value angle between 20 ° ~ 45 °. Scattering type refers to the larger angle of the indicator, half-value angle of 45 ° ~ 90 ° before or greater.

SMD LED-Features

Patch LED in accordance with the luminous intensity and operating current is divided into ordinary brightness of the LED, the luminous intensity between 10 ~ 100mcd called high brightness patch LED. Common chip LED current in a dozen mA ~ dozens of mA, and low current LED operating current below 2mA, SMD LED in the use of the process has a small size, long life, low power consumption, high brightness, environmental protection ,SMD LED  Suitable for mass production, durable and reliable, fast response, energy saving, shock, shock, high resolution, design and many other advantages. In the industrial area is now a lot of use.

SMD LED – positive and negative identification

I believe we will not be unfamiliar with the patch LED, but for the patch LED positive and negative to identify it is no way to start, in the actual patch LED welding process, often encounter how to identify the positive and negative LED chip this problem, Patch LED positive and negative judgment is particularly important, the brightness of the lamp depends on the patch LED to decide, the following will introduce two relatively simple way to identify the patch LED positive and negative.

The observation method of positive and negative judgment method of patch

Patch LED positive and negative judge,SMD LED  we can from the side of the two leads in the patch LED body to determine the form, usually smaller side is positive, the negative is larger it.

Features of SMD led

① light principle is a cold light, rather than by heating or discharge light, so the component life than the tungsten bulb about 50 to 100 times, about 100,000 hours.

② no warm light time, lighting response faster than the average light (about 3 ~ 400ns).

③ electro-optical conversion efficiency, low power consumption, than the light bulb about 1/3 to 1/20 of the energy consumption.

⑤ good shock resistance, high reliability, low system operating costs.

⑥ easy to small, thin, lightweight, no shape restrictions, easy to make all kinds of applications.