The core of an LED is just a small PN junction, and the core of an ordinary LED is only the size of a grain of sand. And the LEDs we buy in the market have been packaged according to different application needs. There are two most commonly used LED packaging forms - in-line and SMD (SMD), of which in-line is currently the most widely used, so that when some enthusiasts mention LED, they immediately think of the length under the tall straw hat. Something with two feet. However, with the development of SMD technology and the continuous miniaturization of products, SMD LED packaging will become the mainstream. At present, the LED light strips produced by Yixiangrui Optoelectronics Co., Ltd. belong to the SMD LED package.
1. Inline LED lamp beads - always popular, never replaced
Commonly used in-line package LED specifications are φ 3, φ5, φ8, φ10, which refer to the diameter of the in-line LED cap body (unit is mm). One of the most common is φ 5 type LED products. Because the shape of the in-line LED is determined according to the aperture size of the LED indicator on the housing required by the final product, when you choose, it should be selected according to your application. The in-line package has several designs to visually differentiate the LED polarity. As shown in Figure 5, the pin under the cut edge of the monochromatic in-line LED cap brim is the negative electrode of the LED; before soldering, the short side of the pin is the negative electrode of the LED; the shell of the monochromatic in-line LED is Generally, there are two kinds of colors: colored and transparent. For example, a red light in-line LED. If the outer casing is also red, it is called a red-emitting red LED. If the outer casing is transparent, it is called a white-emitting red LED. According to this statement, there are specifications such as green hair green, white hair green, white hair blue, and white hair white.
2. SMD LED - a must for microelectronics
Commonly used SMD LED package specifications are 5050, 3528, 2835, 5630, 335 refers to the size of the SMD LED. Because the side-emitting SMD LED is directly mounted on the circuit board and cannot be extended to the casing, the light guide component needs to guide the light to the designated position on the casing, so the general SMD LED package is a transparent casing. There are also some designers who arrange SMD LEDs in arrays to make small LED displays, which is also a usage. In the side-emitting SMD LED package, the side pin with the green (or blue) dot is the negative electrode of the LED.
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