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Suggestions For Outsourcing PCB Assembly And Prototype Producing
It often does not make sense to invest in expensive production equipment if you merely need to spin several prototypes and as an alternative subcontract your manufacturing of PCB prototypes to a trustworthy vendor. I am going to aid you find a suitable supplier and give some advice as to what to look out for when choosing a supplier.
Often you will find a quotation system on contract manufacturer websites. Using this system, you can get an instantaneous quotation for your board or assembly. This will help you save time when evaluating several vendors. You should be able to enter all of the board information such as board thickness, material etc. and special requirements such as milling, surface treatments into the quote system. This will make certain an accurate quote without the danger of surcharges later on.
Typically the cost per board will decrease as volume increases. This is a result of the fairly high setup expense of circuit board manufacturing and component assembly. A number of vendors which specialize in smaller-quantity prototype production will employ a system where boards from several customers are combined. This permits the setup process to be completed once for numerous orders which will help lower the cost per board. For medium volume, employing a normal production procedure is more cost effective though. When you are still in the design phase of your product, you do not wish to spin a large number of boards initially. Once you refine your design you may gradually want to raise the board volume.
If you are making a prototype board then vendors will usually only offer certain types of standard materials and thicknesses because they are trying to combine production of your boards with other customer boards. The production cost will usually decrease with a longer lead time which will give the manufacturer more freedom in scheduling the production. When you enter your information in the instant quote section, you will notice that the production expense will vary depending on the lead time. If you can wait then cost will be lowest. If you are in a hurry then you will have to pay extra to be moved ahead of the line.
Ensure that your contract manufacturer will support the file format for manufacture that you provide. The most common format for PCB manufacture is the Gerber format but a number of vendors will also accept board files from widespread PCB software products. If you select a supplier which also offers circuit board design services then you can rest assured that there won't be any extensive delays in case your board files have a problem that needs to be corrected.
Ensure that your supplier can handle the package type of each component on your board if you plan on subcontracting the PCB assembly. You should find a list of which kinds of components your vendor can assemble online. Some vendors may not be capable to mount special BGA or chip-scale packages. If in doubt be sure to e-mail your supplier ahead of time.
Some contract manufacturers will have in stock an inventory of standard SMT and through-hole components. You will save time if you can pull from your vendor’s stock rather than ordering each component yourself. Make certain to state which parts you want to deliver yourself when you upload your bill of materials.
Your vendor may generally also manufacture the SMT stencil which is required for SMT board assembly. Production of the stencil requires some time. So ensure to purchase the stencil immediately when buying your boards to reduce the PCB assembly time.
To ensure quality, ensure that your supplier carries the usual quality approvals. Also, if your board needs special testing, be sure your supplier has suitable testing equipment. Some testing will require extra time and cost.
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