How To Choose Components For HASL SMT Assembly?

You may observe that affected by environmental factors, the current SMT Assembly Surface Finish basically adopts the lead-free process (HASL). Which aspects should pay attention to when choosing components for HASL surface finishing in PCBA?


1. The Heat Resistance of The Components 
Due to the high melting point of lead-free solder, one of the characteristics of the SMT lead-free (HASL) soldering process is the high soldering temperature, which brings about the problem of heat resistance of components. Therefore, when evaluating component suppliers in the PCBA lead-free process, it is not only necessary to evaluate whether they use toxic and harmful substances, but also the heat resistance of the components. Apparently, different components have different heat resistance modes. Some are impact-resistant but not high-temperature resistant, and some are high-temperature resistant and not impact-resistant; The temperature resistance curve of components is not equal to the soldering temperature curve. If not attention, it will damage certain component.

2. The Compatibility of Solder & Component Surface Coating Materials 
In lead-free soldering, the types of component soldering end coating materials are the most complex. The types of surface plating on the solder end of lead-free components include pure Sn, Ni-Au, Ni-Pd-Au, Sn-Ag-Cu, Sn-cu, Sn-Bi and other solder alloys with different alloy layers; Therefore, their interface reaction speed various, the resulting brazing seam structure is different, and the reliability is also different. Due to the variety of electronic components and the complex plating of the component soldering ends, there may be a mismatch between the soldering ends of some components and the solder, causing reliability problems.


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1)Strength Guarantee

▪ SMT factory: With imported SMT machines and multiple optical inspection equipment, which is able to produce 4 million points per day. Each process is equipped with QC personnel who will keep an eye on product quality.

▪ DIP production line: Two wave soldering machines and more than 10 employees who have worked for over three years. That’ s to say, these workers are highly skilled and can weld various SMT & DIP components.

2)Quality Assurance With High Cost Performance

▪ High-end equipment can paste precision special-shaped parts, BGA, QFN, 0201 package. It can also be soldered prototype pcba via SMT machine and placing bulk materials by hand.

▪ Both samples, small and large batches can be produced. And there is no SMT Machine starting cost.

3)Rich Electronic Products SMT Soldering Experience With Stable Delivery

▪ Accumulated services to thousands of electronics companies, involving SMT soldering services for various types of automotive equipment and industrial control motherboards. Furthermore,PCBA Products are often exported to Europe and the United States, and the quality is able to be affirmed by new and regular customers.

4)Strong Maintenance Ability & Reliable After-Sales Service

▪ The maintenance engineers have sophisticated experience so that those defective boards caused by all kinds of smt soldering can be repaired. Meanwhile, ensuring the connectivity rate of each circuit board also make sense.

▪Order problems feedback will get response, solution and solved as soon as possible.


The Complete Guide to PCB Surface Finishes: HASL, OSP and ENIG

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