Due to the complexity of determining the turn time of PCBA services, our policy is that turn-time begins immediately after all the parts and PCBs are ready and all the PCB files (Gerber files/other PCB files, etc.,), Centroid (Pick & Place PNP file, or XY Data or files in other formats), BOM, and all other necessary data or documents/images/photos are complete for our assembly work.

Our online instant quote system gives a rough idea of the PCBA cost, including the tooling, laser-cut steel stencil, and labor. In the case of Turn-key or partial Turn-key PCBA, the cost of parts will be added. We do not mark up the parts that we will source for you.

Excessive parts do exist because we will ask for some percentage of overage for consigned/kitted orders, or we will buy more for the same purpose for those Turn-key orders. You can either ask us to ship back to you these unused parts together with the loaded boards, or keep them in our shelf for your next order. All up to customers.

Yes. We can handle BGA of 0.25mm pitch with X-ray testing. For BGAs, we need to tent any vias under the BGAs with a solder mask to ensure the soldering quality.

Yes. This practice is called partial Turn-key. You can supply some parts, and we source the rest of the parts on your behalf. We will ask for your approval for anything that is not sure at our side. In case parts crossing or substitution is needed, we will again ask for your final approval.

Centroid is the special file for assembly used for quickly programming the assembly machines. This file is also known as an insert file, 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 the Board (Top or Bottom). Only surface mounting parts are listed in the Centroid.

We need Gerber files, Centroid data, and BOM for your PCBA orders. As have already placed your PCB order with us, actually you only need to send the latter two if your PCB Gerber files have included the layers of silkscreen, copper track, and solder paste. If your PCB Gerber files are missing any of the above-mentioned three layers, please resend them, as this is the minimum request for PCBA. For the best possible result, please also send assembly drawings, instructions, and photos to us to avoid any ambiguous and even mistaken placement of parts, though these are not required by most of the assemblers.

Proper SMT machine setup and operation require parts overages. Unused and excessive parts supplied by you or purchased by us will be packaged and returned to you with the assembled boards.

Lingzhi Electric Circuit is a manufacturer specializing in PCB prototyping, low-volume production and PCB Assembly under one roof based in Shenzhen, China. Lingzhi Electric Circuit strives to be the easiest manufacturer for engineers to work with.