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The ASCII / ODB /CAD – Design output file is perhaps one of the most effective the customer can provide to accurately assemble your circuit design. It allows for the seamless transfer of YOUR data into our automated assembly and inspection equipment. Please see attached Aegis CAM Guide to output the ASCII or ODB from your PCB design software.


Bill of Material is your current revision parts list for the build. It is typically an excel file. In any excel text format, it is expected that data is coordinated in row and column format. Each row representing a different component item. *In order to provide an accurate parts cost, it is very important that your BOM has valid (correctly formatted) and available (non -obsolete) part numbers. Our cost database system obviously will not be able to price part numbers that are incorrect or obsolete.

Gerber data is a complete set of digital photo image files required to fabricate your bare board. Each file within the gerber set represents a particular copper layer, silkscreen, solder mask and the solder paste layer. Even if TJM WEST Electronics is not providing the PCB, we will need the solder paste gerber layer in order to produce a stencil. The entire gerber set is typically presented as one zip or archive folder containing multiple files (one file for each layer) of the PCB.

Assembly Drawing - It’s not always possible to have all of the information needed for a successful PCB assembly printed on the blank PC board. Some smaller assemblies will have no reference designator silkscreen. This is most important to note when it comes to polarities. We have found that while CAD packages designate a two pin device as pin 1 and pin 2, there are no standards that define that one pin is always the cathode. What this means is that we can’t always rely 100% on the CAD/CAM import to determine apart polarity. Additionally a drawing can provide special notes, instructions or precautions for certain items and the best method to be installed, soldered and cleaned. LED orientations and markings is a good example of drawings providing visual aid to the assembler. If an assembly drawing is available, we encourage that it is provided.

Fabrication Drawing - This reference drawing is typically provided as part of the gerber file set. In the event the customer is consigning the bare board or the drawing is not provided in the gerber set, we request a fabrication drawing to provide an incoming review and revision verification.

Too often kits are put together by administrative or non-technical personnel with perhaps a limited understanding of the packaging forms best suited (or required) for automated assembly process. TJM WEST Electronics offers the following guideline to assure your parts kits are organized, protected from damage and ready to roll into a successful build!

  • Inventory / Review – It is assumed that supplied kits have been reviewed, inventoried and prepared by the customer to go right on to our assembly line. Shortages may result in units being assembled without. In the case of gross shortages, like an item completely missing or items that cannot be installed later manually by iron (e.g. BGA or QFN). This may result in a stop of the project and a re-schedule. It is preferred that  “pick list” of the quantity’s customer shows being consigned is provided.

  • Identification – All components should be clearly identified as to a part number that is referenced in the BOM. If you are substituting an item to a number not listed on the BOM, please identify which line item and part number is being substituted. Otherwise, we question whether the item is provided in error and a confirmation could possibly delay the build process.

  • Organization –Very often kits are mix of new items and residual from prior builds. Original quantity on label is not correct and may not be labeled accordingly. Be careful when providing residual items. Keep like items (of same part number) together. Separate SMT component from Thru-hole. It is not required, but helpful if items are labeled and separated by Top / Bottom side assembly. Every little effort along these lines leads to successful, on-time build
  • ESD/ Packaging
    • When possible always keep components in their original factory packaging. Especially fine pitch items with fragile leads.
    • Semiconductor devices are to be maintained in proper ESD protected containers, sticks trays and bags.
    • When providing cut tape, it is important not to bend the tape in half. The crease interferes with a proper feed into the pick and place machine
    • DO NOT USE SCOTCH TAPE. Use ESD, non-static generating tape to enclose your components.
  • Attrition – Customer supplied kits that are not provided with enough components, or enough “extra” components result in shortages cause delays and impact quality. During the set up process it is often necessary to remove a number of components from cut tape. We suggest the following attrition quantities.
    • 0201 – 0402 Passives and LED – A minimum of 20 extra components (per set up).
    • 0603 – 0805 Passives and LED – A minimum of 10 extra components (per set up).

In general any tape and reel passives in low cost should have a 5% attrition.

At the completion of your build, the residual kit or any remaining parts will be returned with the completed assemblies. We also prefer to return the empty component packaging as we have found this to s be reference in some scenarios.


Assembly – TJM WEST Electronics offers 3 Assembly delivery service options.

*Note - All parts and PCB must be on hand prior to start of day one. When order includes fabrication, it is assumed assembly starts same day as, and no later than, the day following dock date of the fabricated PCB.
  • Standard Delivery – 7 working days or better guaranteed.
  • One week (5 Day)  Turn – Guaranteed product delivery in 5 working days. Orders must be placed by 10:00 AM Arizona time for day one to start next day.
  • 3 Day Turn – Guaranteed product delivery in 3 working days. Orders must be placed by 10:00 AM Arizona time for day one to start next day.

Fabrication – TJM WEST Electronics offers 3 Fabrication delivery service options.

*Note - When order includes fabrication, it is assumed fabrication Day 1 starts upon receipt of the correct revision gerber data, and data is free of any pending design rule or fabrication process questions that need to be clarified.
  • Standard Delivery – 10 working days or better guaranteed.
  • One week (5 Day)  Turn – Guaranteed product delivery in 5 working days. Orders must be placed by 10:00 AM Arizona time for day one to start next day.
  • 3 Day Turn – Guaranteed product delivery in 3 working days. Orders must be placed by 10:00 AM Arizona time for day one to start next day.