What Are Files Requirements for PCBA?

PCB Assembly needs a few files for us to start your PCBA work. Please send the following files to us in the proper format. You will have two options to send these files to us, one is through our online PCB quote page, and the other is to send via email at Support@nextpcb.com referring to your order number and putting the email subject as "Files for Your Order Number".

Gerber Files

The same Gerber files in the format of RS-274X that you sent to us for your PCB fabrication will be required to assemble your boards. As a minimum request, the PCB assembler needs the files of three layers: Silkscreen, Copper (Track), and Solder Paste. So please make sure that all these files have been included and reviewed on your side. Of course, we will also review your files before assembly starts to make sure all the information is complete and accurate for assemblies.

BOM (Bill Of Materials)

BOM is a list of parts used in manufacturing the end products. It shows what parts are needed to assemble the boards, and where these parts should be placed and assembled. We only accept the BOM in the format of .xls, xlsx. The BOM for Turn-key and Partial Turn-key orders may request a few more information than the BOM for consigned/kitted orders.

BOM for consigned/kitted orders may include the following information:

• Line#
• Quantity Per Part Number
• Reference Designator
• Part Number
• Part Description
• Package
• Type (Surface mount, Thru-hole, or Hybrid)

BOM for Turn-key and Partial Turn-key orders may include following information:

• Line#
• Quantity Per Part Number
• Reference Designator
• Part Number
• Part Description
• Package
• Type (Surface mount, Thru-hole, or Hybrid)
• Manufacturers Name
• Manufacturers Part Number
• Distributors Part Number

Click to Download a sample of BOM

Centroid File

Centroid is the special file for assembly used for quickly programming the assembly machines. This is also known as aka Insertion, Pick-N-Place, or XY Data. Some of the CAD tools will automatically generate this file and some not, but you may need to modify the file and then generate the Centroid file. The Centroid file describes the position and orientation of all the surface mount parts, which includes the reference designator, X and Y position, rotation, and side of board (Top or Bottom). Only surface mounting parts are listed in the Centroid.

Click to Download a sample of the Centroid File

Others

For us to properly assemble your printed circuit boards, we strongly recommend you send all other documents or information related to the PCBs to us, which may include your assembly drawings, special assembly instructions, and even images or photos of your work. This information helps us better understand your assembly needs, correcting some ambiguous or even mistaken placements and ends up with an excellent job. Send them to us, though normally not required by assemblers.