Q: 1. Who is multitech-pcb.com?
multitech-pcb.comis China Shenzhen-based manufacturer specializing in PCB prototyping, low-volume production and PCB Assembly service under one roof. multitech-pcb.comstrives to be the easiest manufacturer for engineers to work with. multitech-pcb.com– PCB Prototype the
Q: 2. Do you accept to assemble the boards that are not made by multitech-pcb.com?
Currently we do not use other’s PCB to assemble at our facilities. We offer the PCB fabrication, parts sourcing and PCB assembly in a continuous and smooth manner to save our customer’s time and money.
Q: 3. What files and documents do you request for my PCBA orders?
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.
Q: 4. What is Centroid?
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.
Q: 5. How do you request for the shipping and marking of the parts for the consigned or kitted order?
We hope you can mark on any individual package or box with the corresponding line number on BOM, manufacturer’s part# or customer’s part#, quantities. A detailed packing list is preferred to enable us to count and check upon receipt of your parts.
Q: 6. What is your requirement on the parts overages for consigned/kitted PCBA?
Proper SMT machine setup and operation requires parts overages. Unused and excessive parts supplied by you or purchased by us will be packaged and returned to you with the assembled boards.
SMT parts which are not supplied on reels
should be on one continuous strip of tape.
If you need to assemble the same SMT part in different boards, do not cut them into strips, please keep them in the continuous strip of tape or on the reels.
Capacitors, Diodes (0603, 0805, 1206, 2225, SOT, SOD, MELF - packages) require a minimum of 50 pieces and have to exceed the required quantity by 30 pieces. (e.g.: assemble quantity 40 pieces – we will need 70 pieces – this meets our minimum of
50 pieces plus 30 pieces over assemble quantity).
Resistors, Capacitors, Diodes (0201, 0402, miniMelf, miniature packages) require a minimum of 100 pieces have to exceed the required quantity by 50 pieces. (e.g.: assemble quantity 80
pieces – we will need 130 pieces- this meets our minimum of 100 pieces plus 50 pieces over assemble quantity).
A small number of excess(1-5 pieces based on the total quantity of assemblies) is requested for expensive parts such as IC,
BGA, QFP, Connectors, etc., this will ensure smooth assembling and shipping your assembled boards on time. If you have any question or doubt, please send more extra or contact us for answers.
Q: 7. Can you source some parts for my assembly?
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.
Q: 8. Do you assemble BGA? Any special requirement on this?
Yes, We have the ability to handle BGA of 0.25mm pitch with X-ray testing. For BGAs, we need to tent any vias under the BGAs with solder mask to ensure the soldering quality.
Q: 9. How do you handle the excessive and unused parts?
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 you.