What is the difference between LED round head and straw hat?
1. Appearance difference
The difference in appearance between straw hat diodes and round head diodes is obvious. The end face of the straw hat diode is flat, and the entire diode looks like a straw hat, hence the name. The end face of the round-head diode is round, and the shape of the entire diode does not change much, similar to ordinary diodes.
2. Structural differences
Straw hat diodes and round head diodes also differ in their construction. Straw hat diodes are improved on the basis of ordinary diodes, adding a larger size so that they can withstand greater power. The structure of the round head diode is basically the same as that of the ordinary diode. It is also composed of two semiconductor materials, but it uses a smaller size than the straw hat diode.
3. Differences in uses
Straw hat diodes and round head diodes also have different uses. Straw hat diodes are suitable for high power circuits, such as motor control, power supply and other fields. Round-head diodes are suitable for low-voltage, low-current, high-frequency circuits, such as regulating power supplies and amplifiers.
4. Performance differences
There are also certain differences in performance between straw hat diodes and round head diodes. Straw hat diodes have a higher reverse voltage and can withstand higher reverse voltages, while round head diodes have a lower reverse voltage and are mainly used in low-power, high-speed applications. In addition, straw hat diodes generate more heat and require a radiator for heat dissipation, while round head diodes generate less heat and do not require an external radiator.
In short, there are certain differences between straw hat diodes and round head diodes in terms of appearance, structure, use and performance. Understanding the difference between the two can help people choose the appropriate diode for different applications.
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straw hat LED,round LED
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?