Friday, June 10, 2005

PCB TERMS

Aperture
This is a text file describing the size and shape of each element on the board. These are also known as a D-code lists. These lists are not necessary if your files are saved as Extended Gerber with embedded Apertures (RS274X).

Aspect Ratio
Standard aspect ratio of 6:1 has been figured into our quote forms. This equals the smallest hole size that can support plating. It is calculate by taking the board thickness divided by the smallest drill diameter.

Board Thickness
Standard base thickness is 1/16 inch, which is also called out as 0.062" or 0.059" 0.031", 0.047", 0.093", and 0.125". A typical tolerance is within 10% of the given thickness.

Clearances
A clearance (or isolation) is a term use to describe the space from power / ground layer copper to through hole. To prevent shorting, ground and power layer clearances need to be .025” larger than the finish hole size for the inner layers. This allows for drilling, and plating tolerances.

Component Side
In order to prevent building a board inside out, . Component, layer 1, or 'top' layer should read in facing up. All other layers should line up as though looking through the board. Use layer designators, pass through marks, or correct reading layer text.

Copper (Finished Copper)
This is how much copper your board will have on its surface. It is the copper foil thickness, plus plated copper, minus surface preparation. It is given in oz / per sq foot. 1 oz = a minimum of 0.0012”- 0.0014” thickness.

Cut lines
The cut line is going to be used to program the router path and it represents the board outside edge. Typical route tolerance is +/- 0.010". It is recommended to keep outer layer copper 0.01” and inner copper 0.025” from the cut line to avoid contact with the board edge.

HAL
Acronym HAL, which is the process of putting solder on exposed copper of the circuit board. Approx. 60/40 Tin/Lead mix is used. Also known as a SMOBC which is an acronym for Solder Mask Over Bare Copper.

Pad Sizes
Your outer layer pads need to be 0.017" larger than the finish tool size (0.010” for vias). Your inner layer pads need to be 0.018" larger than your finished tool size. If your design has any pad to trace junction minimum requirement, add that to the above numbers [0.017" pad + 0.002" junction should have 0.019" pad].

Silk Screen, Nomenclature, or Legend (Artwork)
Marking ink is used to identify components during later assembly and troubleshooting processes. This can be placed on one or two sides (in yellow or white), depending on the board design and application. We can include your company logo if it is provided on the drawing specs.

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