Mechanical Layer
The Protel 99 SE provides 16 mechanical layers, which are used to set the dimensions,

data marks, alignment marks, assembly instructions and other mechanical information of

the board.This information may vary depending on the requirements of the design company

or PCB manufacturer.Can perform menu commands Design | MechanicalLayer circuit boards

set more mechanical layer.In addition, the mechanical layer can be attached to other

layers together with the output display.

Solder mask layer
Apply a coat of paint, such as antisolder paint, to all areas outside the pad to prevent

tin from being applied to these areas.The solder resistance layer is used to match pads

during the design process and is automatically generated.The Protel 99 SE provides two

Solder resistance layers: Top Solder and Bottom Solder.

Paste mask layer(SMD layer)
It acts in a similar way to the solder barrier, except for the corresponding surface -

bonded component pads during machine soldering.Protel99 SE provides Top Paste and Bottom

Paste protection layers.

It is mainly aimed at the SMD components on PCB board.If the board is full of DIP

(through-hole) components, there is no need to output Gerber files on this layer.Before

the SMD components are pasted on the PCB board, the solder Paste must be applied on each

SMD solder pad. In the steel mesh used for tin coating, the Paste Mask file must be used

to process the film.

The most important thing to be clear about the Gerber output of Paste Mask layer is that

this layer is mainly for SMD components. At the same time, compare this layer with the

Solder Mask introduced above to understand the different functions of the two layers,

because the two film pictures are very similar from the film pictures.

Keep out layer
Use to define areas on a board where components and wiring can be placed

efficiently.Draw a closed area on this layer as a valid area for cabling. Automatically

layout and cabling cannot be done outside this area.

7 Silkscreen Layer 7 Silkscreen Layer
The screen printing layer is mainly used to place printed information, such as the

outline and annotation of components, various annotation characters, etc.The Protel 99

SE provides Top Overlay and Bottom Overlay for screen printing.In general, all kinds of

annotation characters are in the top layer of screen printing, the bottom layer can be

closed.

Multi Layer
The solder pads and through-holes on the circuit board need to penetrate the whole

circuit board to establish an electrical connection relationship with different

conductive graphic layers, so the system is specially set up an abstract layer -

multilayer.Generally, the pads and holes should be set on multiple layers. If this layer

is closed, the pads and holes will not be shown.

Drill Layer
The borehole layer provides drilling information during the fabrication of the circuit

board (e.g. solder pads, which require drilling to pass through holes).The Protel 99 SE

provides two Drill beds, DrillGride and Drill Drawing.

Ping You Industrial Co.,Ltd
Ping You Industrial Co.,Ltd is a professional and reliable one-stop PCB solutions provider for customers specialized in manufacturing quick turn prototypes and small volumes.Topfast is responsible for overseas business development.With high quality and on-time delivery products we won the market's wide acclaim. We will continue to focus on customer satisfaction, along with "high quality "and "fast delivery", we will become a PCB service provider worthy of customer trust.