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ETAG Co. Products UL

ETAG Co. Products : UL Online Certifications Directory


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PCB Tolerances 

Inner Layer Clearances

We require a minimum of 0.010" inner layer clearance.

Copper to Edge of Printed Circuit Board

Minimum of 0.010" (outer layers) and 0.015" for inner layers (0.020" preferred for inner layers). For scoring, minimum of .015 for outer layers and .020 for inner layers.

Pad Size/Annular Ring

Pad size should be at least + 0.010" over finished hole size for vias and + 0.014" over finished hole size for component holes. This means the annular ring (radius of the pad) should be at least .005" for vias and a minimum of 0.007" for component holes.

Hole Size

+/- 0.005"  Standard Spec (applies to holes up to .250", larger holes will be routed, see Rout tolerances below)
+/- 0.005"  Custom Spec

Example: Customer Drill Chart with Zero Hole Tolerance

PCB Tolerances

Our minimum finished hole size; 0.008". Call your salesperson if you required a finished hole size less than 0.008".

Printed Circuit Board Thickness:

Thickness tolerances may vary 10% (min.+/- 0.005")

Minimum Board Thickness



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PCB Inner Layer Thickness

Tolerances do not apply to the inner layers of prototypes.

Rout (Board Outline and Internal Cutouts)

The Outer Layer Tolerances on Standard Spec defined boards is +/- 0.010" 
(+/- 0.005" available for Custom Spec upon request)
Note: We rout to your board size using the center of the board outline on your mask layer.

Copper Trace Width/Spacing (Trace and space)

Requirements: A premium is charged for trace width/spacing less than .007".   
(We can process .004" for 1 oz. CU. finished (outer layers) and .5 oz. CU finished (inner layers).
For 1 oz. finished copper weight (inner layers), the minimum trace width/space is 0.005"
For 2 oz. finished copper weight (inner & outer), the minimum trace width/space is 0.006"
For 3 oz. finished copper weight (inner & outer), the minimum trace width/space is 0.010"
For 4 oz. finished copper weight (inner & outer), the minimum trace width/space is 0.012"
Note: Advanced Circuits does not offer weights such as 1.5 or 2.5 ounce finished on standard and custom spec orders.

Trace Width/Air Gap

The greater of +/- 20% or +/- 0.002"

Slot Width

Minimum 0.031" in width. For smaller width, call your salesperson for pricing and turntime.

Tab Rout Spacing

Please allow 0.100" spacing between your individual pcbs for tab rout spacing. When scoring there should be no spacing between boards.

Silkscreen (Legend)

0.005" minimum line width.

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