If the PCB boards have a limited spacing to put the silkscreen, the silkscreen layer can be cancelled in PCB fabrication process, but it must be present by another layer as assembly drawing (Top or bottom layer).Some extra marks or signs can be moved to GM layer(Geometry).For some polarity or orientation components, the polarity point or the Pin 1 should be clearly and correctly marked.Silkscreen includes each reference designator for your components, identifiers, company logos, switch settings, test points, part. Silkscreen refers to a set of labels that are printed on the surface layers of a circuit board. Each silkscreen designator should be matched with it’s component accordingly (do not confuse the reader) A unified PCB design package with the best CAD tools for PCB layout and silkscreen placement.It must be presented as sequential turns (from left to right from top to bottom) The silkscreen is used to identify components, warning symbols, test points, logs, parts of the PCB, marks, date codes, company logos, manufacturer marks, and.It will be as an anti-solder resistance once the silkscreen overlapped on the SMT PADs Spacing: the silkscreen should have 6mil spacing to solder mask opening pad, component soldering holes, test points, fiducial marks, etc.Width: the silkscreen width ≥4mil, (the silkscreen cannot be printed out if the width less than 4mil).General guidlines to PCB silkscreen design The silkscreen profile for some special package components (BGA, QFN,etc) should be the same size as it’s component profile.For multi-pin components, which have sequential no.# of pins, the pin no.# 1,2.3….The direction of the silkscreen should be the same as the orientation as the data sheet of the components (For example, IC, diode,Led,etc).This will avoid the misunderstanding to PCB assembly process.Do not place the silkscreen over on the RF track (Radio Frequency).
Dot not place the silkscreen on the through plated holes.Place and direction of the components:Commonly, it would be better to mostly place all the components in the same direction instead of different directions, or else which will take extra work to functional test, verification, soldering, etc.Note that the width of the silkscreen is changing from it’s different base copper thickness listed as in below table: Base copper(oz) Read MoreĮxcept PCB assemblies,we are also a truly vertically integrated service provider in network communication,medical system,telecommunication, and industrial embedded system… Read More Weller’s experts in PCB fabrication & PCB assembly division is dedicated to providing complete customized manufacturing and engineering services to worldwide’s customer. Weller has been focusing on prototypes and volume production of technologically advanced PCB assemblies,backplane PCB assemblies as well as electronics manufacturing services. Weller Technology has been providing Electronic Manufacturing Services (EMS) and Printed Circuit Board (PCB) assembly more than 10 years.
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