What types of solder paste are used in SMT assembly?

SMTMany kinds of production raw materials are used in the surface mount technology (SMT) processing of the factory.Solder pasteOne of the more important ones is that the quality of the solder paste will also have a direct impactSMTThe soldering quality of surface mount technology (SMT) processing, and different types of solder paste also need to be selected for different production processes and products. Below, Shenzhen JJY Solder Paste Manufacturer will briefly introduce the common classifications of solder pastes to you:

I. Classification by environmental protection requirements

Leaded solder paste and lead-free solder paste

The lead content in eco-friendly solder paste is extremely low because lead is harmful to the human body. Among the electronic products exported to Europe and America, the requirements for lead content are particularly strict. Therefore, lead-free solder paste has gradually gained popularity in China. With the increasing emphasis of the country on environmental protection,SMTThe adoption of lead-free solder paste in the surface mount technology (SMT) processing industry will become a clear trend in the coming years.

In lead-freeSMTDuring the surface mount technology (SMT) processing, it is more difficult to apply tin compared to lead. Especially in handlingBGA,QFNWhen waiting for components. At this time, solder paste with a higher proportion of silver is often used. The common silver-containing solder pastes available on the market respectively contain3‰and0.3‰The silver, this type of solder paste is currently relatively expensive.

Ii. Classification by melting point

High-temperature solder paste: such as tin, silver and copper305,0307It is suitable for scenarios that require welding at a relatively high temperature, etc.

Medium-temperature solder paste: such as tin-bismuth-silver alloy, suitable for soldering processes with medium temperature requirements.

Low-temperature solder paste: Mainly composed of tin-bismuth alloy, it is suitable for products that are sensitive to temperature or require low-temperature soldering.

inSMTDuring the surface mount technology (SMT) processing, the appropriate melting point of solder paste should be selected based on the specific characteristics and requirements of the product.

Iii. Classification by the fineness of tin powder

3Powder solder paste: Suitable for larger components, such asLEDThe lampSMTSurface mount technology processing Because of its relatively low cost, it is often chosen.

4Powder solder paste: Used in the treatment of fine pins in electronic and digital productsICAt that time, use this type of solder paste

5High-grade solder paste: For precision soldered components such asBGAAs well as high-demand products such as mobile phones, tablet computers, etc.SMTIt will be given priority in surface mount technology (SMT) processing5Powder the solder paste to ensure the quality and accuracy of the soldering.

Through the above classification and selection guidance, it can be carried out more efficientlySMTSurface mount technology (SMT) processing and meeting the actual needs of different products.

JJY owns16With years of experience in research and development and production, we have a strong technical force and stable product quality. Flagship products:QFNHigh solder climbing rate solder paste, zero halogen solder pasteVOIDLow-porosity solder paste, laser solder paste, water-washed solder paste, and high-reliability ones used in military, aerospace, power, photovoltaic and other industriesSn62Pb36Ag2Solder pasteSn62.8Pb36.8Ag0.4Solder paste6337Solder paste, transparent and colorlessLEDHigh-brightness anti-monument solder pastemini-LED/micro-LEDDie bonding solder paste, high-reliability lead-free low-temperature solder paste, low-temperature solder paste for heat sinks, lead-free medium-temperature solder paste, lead-free high-temperature0307/105/305Solder paste, etc. Proprietary technology, strict quality control, continuous stability, making customers worry-free, efficient, cost-effective and competitive!