Talking about improving the yield of white light SMD package can effectively reduce production cost

Regarding raw materials, the same batch of chips, some companies can only achieve 80% yield (20% of BIN products), while some companies can achieve a yield rate of more than 90%, the gap is very large, the yield rate The high and low determines the final cost increase and decrease of a batch of goods. There are many factors affecting the yield rate, such as the viscosity of the silica gel and the uniformity of the particle size of the phosphor. The glue with too low viscosity and the phosphor with larger particles are difficult to control in the production process. It is prone to many BIN products, which will increase the waste of raw materials and increase the overall production cost. If such a batch of goods is produced, if the total production cost of the product (the cost of all the raw materials required for production, as well as the wages and expenses of the employees, etc.) is calculated, the result is definitely a big loss. Take the SMD3528 package as an example. If the yield rate is increased by 5%, the number of good 1KK products will increase by 50,000 lamps that meet customer requirements, and the market price of 50,000 lamps will be around 7000-10000 yuan. about. That is to say, if the yield rate is not effectively improved during the production process, this value is lost, thereby increasing the production cost.

Improving the yield of white SMD is very important in the selection of phosphors. It is necessary to choose a phosphor suitable for SMD packaging, so that the relevant SMD package glue can be used to make a perfect product. The price of imported phosphors differs from the price of domestic phosphors by nearly 1,000 yuan / 100 grams. Although domestically produced phosphors are cheap, the production yield is not high, and the cost can be reduced from the surface price. In fact, the total production cost is eventually increased. The above example has already explained this problem. The imported phosphors are more mature and stable due to their production technology. They are now favored by the majority of white SMD manufacturers, such as H102 and H132 launched by Hongda (H102 is an upgraded version of the original model 00902, H132 is the original model 432). Upgraded version), both phosphors have a particle size of 13um, and the particle size is centered. It is matched with a glue with moderate viscosity (such as: Japan's Shin-Etsu 1018), and the strict control on the production improves the yield. It's very easy. If you calculate this way, the phosphors that can improve the quality of the good products are more expensive, but the cost of the imported phosphors may be lower, which will create more profit for the enterprise.

Many white light engineers have misunderstood phosphors for phosphors. It is not the larger the particle size, the higher the luminous efficacy of the phosphor, and the larger particle phosphor needs to be excited by the large-sized blue chip corresponding to the wavelength to achieve the best effect. Larger particles of phosphors are suitable for high-power packaging, because high-power companies generally do not have a high monthly capacity, and the overall effect does not look very different. SMD is different. The average company is producing KK-level production. Only by increasing the yield can it increase its shipping rate and maximize its profits.