Engineering

Surface Finishes 

Finish Description
HASL (Hot Air Solder Leveled)  Solder is deposited on features that are not covered with Solder Mask. Solder Thickness varies from 0.2 to 1.2 mils. This variation is due to board circuit density, aspect ratio. Solder consists of 63%/37% eutectic Tin/lead

OSP (Organic Solderability Preservative)  A transparent organic coating is deposited on features that are not covered with solder mask.

ENIG (Electroless Nickel/Gold)  Electroless nickel and Electroless gold are deposited on features that are not covered with Solder Mask. Thickness for Nickel is between 80 to 150 micro inches and Gold thickness is 3-6 micro inches.

GoldFlash  Electrolytic nickel-gold deposited on solderable features. Typically 150-200 micro inches of nickel is deposited, and 5-10 micro inches of Hard gold. Gold flash is applied to features after pattern Copper plating.
Immersion Silver  Silver is deposited on features not covered with solder mask. Thickness of silver is 4 to 20 micro inches.


White Tin  Immersion tin is deposited on features not covered with Solder mask. Thickness is typically 30-40 micro inches.

Carbon Ink for Key pad application A conductive carbon paste is applied on selective pads for contact purposes, e.g.. Keypads of calculators, etc.

Wire Bondable Soft Gold Electrolytic soft gold is plated on features that require bondable gold for wire bonding application. Depending on the type of wire bonding used, the thickness of gold varies from 20 to 50 micro inches. Nickel thickness is between 150 to 250 micro inches.

Technology at Your Fingertips

J-Cube Technologies offers the Design for Manufacturing (DFM) at no charge/$0/free as an added value to help you make sure that no violations or mistakes happen during the design process. This will save you time, money and product delivery delays.


Servicing OEM, ODM & CM’s 

Our printed circuit board manufacturers specialize in different areas of PCB manufacturing, giving us the unique ability to not only build your boards economically, but to also maintain the highest quality standards. Because of our high order volumes we have negotiated pricing much lower and we believe you cannot find a better value anywhere else.

Call Today: 514.979.4061 or Fax: 514.375.1554

Email: jdriver@jcubetech.com

7 Common Mistakes Made With Gerber Files



1. Missing Aperture List
Your Gerber files specify what to do and where. Your aperture list specifies what tool to use. A single comprehensive aperture list for all layers should be sent with your gerber files, rather than a separate aperture list for each layer. Please note: An aperture list does not need to be sent with 274X format files. If you send 274D format, we use your aperture list in combination with your gerber files to create your artwork.
Requirements: One comprehensive aperture list for all layers, English Units. Please do not modify the aperture list your software outputs. An aperture list does not need to be sent with 274X format files.
Resolution: All layout packages which output 274D also output an aperture list. Common extensions include .rep, .apt, and .apr. If you have difficulty outputting an aperture list, please send 274X format.

2. Missing Excellon Drill File
Excellon drill files are used to determine what size holes to drill and where. Plated and non-plated holes need to be included in one drill file, with plated and non-plated holes having different tool numbers.
Requirements: Excellon Format, ASCII Odd/ None, 2.4 Trailing Zero Suppression, English Units, No Step and Repeats.
Resolution: Nearly all layout packages will output an Excellon drill file. If you cannot generate one, we can in most cases create one from your fabrication drawing for an engineering fee.

3. Missing Tool List
A tool list is used in combination with your Excellon drill file to create your drill. Your drill file specifies where to place the holes. Your tool list specifies what tool to use. A tool list should be embedded in your Excellon drill file or sent as a separate text file. Using a tool list provided on a fabrication drawing is not preferable, as it eliminates many of the automatic verifications and makes data entry errors far more likely.
Requirements: Tool list embedded in Excellon drill file or sent as a separate text file.
Resolution: If your layout software will output an Excellon drill file, it will also output a tool list. Common extensions include .tol and .rep.

4. Design for Manufacturing (DFM)
Believe it or not, many times people submit orders and forget to attach their Gerber files.
Requirements: Gerber 274X or 274D, English units are preferable.
Resolution: ODB++ files are acceptable;

5. Insufficient Annular Ring
An annular ring is the donut ("annulus") created when your drill pierces a copper layer. It is defined as the radius of this donut. For example, a .030" pad with an .020" hole would have a .005" annular ring. This is required to allow for complete plating on vias, as well as solderability on component holes. Many times people do not allow for the proper annular ring requirements.
Requirements: A minimum of .005" annular ring for vias or a minimum of .007" for component holes is required for manufacturing.
Resolution: All layout packages provide this as a DFM check. Setting sufficient annular ring in your layout software is the preferred method in order to maintain proper copper spacing.

6. Insufficient Copper Trace Width/Spacing
Copper spacing is the minimum air gap between any two adjacent copper features. Trace width is the minimum width of a copper feature, usually traces.
Requirements: A minimum of .005" trace width/spacing is necessary. A premium is charged for trace width/spacing less than .007".
Resolution: All layout packages provide this as a DFM check. Setting sufficient trace width/ spacing in your layout software is the preferred method. Trace width and spacing push and pull against one another, so changing a problem area may require rerouting traces, adding vias, or moving components.

7. Insufficient Inner Clearances
Inner clearance is the minimum distance from the edge of a hole to any adjacent, unconnected, inner layer copper. Sufficient inner clearances help ensure that your drill does not cause shorts to your inner copper layers. This is important for both plated and non-plated holes, as non-plated holes may either cut into an adjacent trace or cause shorts during assembly.
Requirements: A minimum of .010" inner clearance is required and .015" is preferred.
Resolution: Most inner clearance issues can be resolved if negative image inners are provided, but it is preferred to not modify these. Setting these clearances in your layout software is the preferred method, as this will maintain intended connectivity. While most layout packages provide this as a DFM check, not all do. Those that do not can usually be manipulated to check for this violation by setting spacing and annular ring higher.
General guidelines: Spacing + Annular ring = Inner clearance. Another trick that can help resolve problem areas is to move the affected traces to outer copper layers, where this is not an issue.