The solder mask means the green part on the printed circuit board. In fact, it uses the negative output, so when the shape of the solder mask layer is mapped to the PCB board, it is not the green oil , but the copper skin is exposed.
The functions of solder mask layer on the PCB board are shown:
l Preventing the physical breakage of a conductor circuit
l Preventing short circuit from bridge connection in soldering process
l Preventing the copper layer from oxidation
Prevent short circuit between conductive lines and solder joints when proceeding reflow soldering, wave soldering and manual welding
l Its high Insulating brings possibility to high density of PCB boards
The solder mask is mainly Liquid UV Photo-imageable Ink with green, red, blue, yellow, white, black and purple colors, green should be the most commonly used one. And according to those colors available, there are some points in our production for your reference.
l the cost for green, blue, red, blue, yellow, white and black are the same without extra charge, and extra charge needed for purple, matte green, matte black mask.
l For solder bridge, the spacing between IC pins should be min 0.2 m for all colors except black who requires min 0.25 mm
l As for normal case, the lead time for green mask should be shorter than others
Since we just refers to solder bridge above, now comes to a briefly knowing for it:
The solder bridge is the green oil between the two pads or the IC pins, For its narrow need, so it is called the solder resist bridge. If the distance between the pins is too small to meet the factory process, it will be recommended to cancel it and proceeded with full mask openings.
Mask opening: any area without mask printing can be called window opening, it includes areas for solder PAD, paste PAD, trenching, etc.
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