Email:sales@unitpcb.comUnion Circuits Co.,Limited

Union Circuits Co.,Limited

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Contact Us

Contact: Mr Kenly Lei

Sales Manager
Tel: +86 755 2970 9763

Skype: kenly.lei

Contact: Ms Echo Yang

International Sales

Tel: +86 755 3350 1949 Ext. 810

Contact: Ms Mary Huang
International Sales

Tel: +86 755 3350 1949 Ext. 812
Skype: h-p88888

What is SMOBC?

Simply stated, it stands for Solder Mask Over Bare Copper. Traditional solder mask coatings are done over a reflowed tin/lead finish. Although the tin/lead finish is desirable for the pads for better solderability, this tin/lead coating is not necessary for the rest of the circuitry if it is protected by solder mask. The real reason for developing this process was to prevent the wrinkling effect of the tin/lead trapped under the solder mask when it is again reflowed during the assembly operation when the components are soldered with a wave solder machine. 

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