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Pointers For Subcontracting PCB Assembly And Prototype Manufacturing
If you need to produce several prototypes which need PCB assembly, it doesn't make sense to acquire pricey equipment. Instead, you may wish to contract out the production to a dependable vendor. A lot of vendors will offer both PCB production and assembly. I will provide some tips as to what to watch out for when searching for a contract manufacturer.
Frequently you will find a quote system on contract manufacturer websites. Utilizing this system, you can get an instantaneous quotation for your board or assembly. This will help you save time when comparing various vendors. You should be able to enter all of the board details such as board thickness, material etc. and special requirements such as milling, surface treatments into the quote system. This will assure an accurate quote without the risk of surcharges afterward.
The per-board cost will usually decrease with increasing quantity due to the manufacturing setup cost. A number of producers which specialize in smaller-quantity prototype manufacture will utilize a system where boards from numerous clients are combined. This permits the setup process to be completed once for a number of orders which will help lower the cost per board. For medium quantity, utilizing a normal production procedure is more cost effective however. When you produce a product, you obviously do not wish to have to produce a high quantity of boards immediately as you refine your design.
One limiting factor with small-quantity prototypes still is that the variety of materials and material thicknesses will be restricted. If you are utilizing a special material then chances are there won’t be any other customers using the same material. Furthermore, lead time plays a big role in determining cost. A longer lead time allows the manufacturer more freedom in scheduling your production. This is generally reflected in lower costs which you will see in the quote section. Obviously if you are in a hurry and wish to be moved to the top of the pile you will have to spend more money.
Make sure that your supplier can read your production files which typically would be Gerber files for circuit boards but can also be software-specific files in some instances. If you go with a vendor that also offers circuit board design services, your vendor will usually be capable to fix problems that may exist in your board files. That will help avoid unnecessary delays.
Be sure that your supplier can handle the package type of each component on your board if you plan on subcontracting the PCB assembly. You should get a list of what types of components your vendor can mount online. Some manufacturers may not be capable to assemble special BGA or chip-scale packages. If in doubt be sure to get in touch with your supplier ahead of time.
A few manufacturers will have stock of regularly used components which you can pull from instead of purchasing each component yourself. When using your vendor's stock, you need to make sure you indicate which parts you are consigning. You can generally specify this in your bill of materials. The BOM which you upload to your vendor's website should include this data.
If you intend to order the SMT stencil from the same vendor, you should order it right away when buying the circuit boards to eliminate any PCB assembly delays.
To make certain that your circuit boards will function, be sure that your supplier is quality certified and offers the tests and board inspection methods that are needed. Please note, though, that particular tests, such as ICT testing requires additional time and expense to prepare suitable test fixtures.
BGA Inspection Tool. The Model BGA-300 from SMT Tools.
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