PCB surface finishing: HASL background - KingSheng PCBA

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Kingsheng PCBA has been in the field of IC design and PCB redesign Chip decryption ans IC reverse,the research and development of MCU and DSP and other digital control systems for over 10 years.

Printed circuit boards requiring component attachment, whether leaded or surface mount technology(SMT),must have the exposed copper hand areas coated with a protective finish,This prtective coating must be solderable and, at the same time act as a barrier for preventing the copper from oxidizing which causes assembly problems for the end user.In the United States, the predominant surface finish in the PCB industry is HASL. Driven by the push for Solder Mask Over Bare Copper (SMOBC),HASL was born as a reliable method to apply solder to the coper surfaces after solder mask.A thin layer of eutectic solder is deposited on to the exposed copper by passing the boards through a hot,molten wave(or pot) of solder and subsequently blasting the excess solder from the boards using high velocity hot air. This process is currently under scrutiny due to envioronmental and and safety issues(hazardous waste/lead exposure),technological limitations(fine-pitch device assembly),and equipment maintenance expenses to name a few.

Kingsheng PCBA manufacturer is professional and be in advantage of HASL.