SMD LED wafers are fully encapsulated in epoxy resin. The small size of the epoxy resin particles are very difficult to break, the whole lamp body has no loose parts, the inside of the chip is very difficult to break, but also a few thermal effects may be volatile, fusing. SMD LED These features make the SMD led hard to damage. Compared to ordinary bulbs, fluorescent lamps, SMD LED is impregnable, rugged no more than a few times, durable without a few times.
Characteristics of SMD LEDs
① luminescence principle is a cold glow, SMD LED rather than by heating or discharge luminous, so the component life than tungsten bubble length about $number times, about 100,000 hours.
② does not need to warm the lamp time, the light response speed is faster than the General Electric lamp (about 3 ~ 400ns).
The ③ electro-optic conversion efficiency is high, SMD LED the electricity consumption is small, compared to the bulb province about 1/3 ~ 1/20 energy consumption.
⑤ has good shock resistance, high reliability and low system running cost.
⑥ easy to small, thin, lightweight, no shape restrictions, easy to make all kinds of applications.
SMD LED packaging process is to first put fluorescent powder and epoxy resin configuration, make a mold, and then put a good powder of epoxy resin cake, and will be affixed to the chip, SMD LED and then filled with epoxy resin, so that the SMD packaging led.
More common in the market appearance size for the (mm) x50 (mm) SMD LED internal Packaging has three of LED chips, the extension of six pins, welding to the PCB circuit board surface, because it is directly with thermal adhesive affixed to the surface of the radiator, SMD LED so that the heat dissipation has been greatly improved, so that the reliability of a large increase in light decline has also become smaller. For high-power led mainly using high thermal conductivity metal ceramic composite substrate, its main features are:
(1) low heat conduction resistance;
(2) Thermal expansion coefficient match (TCE: 6. 2);
(4) corrosion resistance and yellowing;
(5) Comply with RoHS standards;
(6) High temperature resistance.
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