What is the BOM list?
BOM is short for Bill of Material, it is a list of raw materials, components and parts needed to manufacture a specific final product; it mainly includes the part number, name and quantity. It also may consist of the manufacturer name or supplier of the components, other function columns and a comment section.
In PCB assembly, BOM means the list of all the components needed in a printed circuit board, such as manufacturer, manufacturer part number, brief description, package, quality needed., etc. It is the critical link between the customer and manufacturers for PCBA production.
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BOM list composition
In the PCB assembly processing, the BOM needs to list the PCBA that is formed with what components, also the detailed description, quantity etc., for each component. For example, below are some common compositions:
The importance of BOM in PCB assembly
Why are BOM lists so crucial for PCB assembly?
Requirements for making BOM list of PCB
Factors to be considered when making a BOM list
What should you do when you receive an order for 50 items of PCB assembly from a consumer? Besides arranging PCB production, you also need to consider the following points when making a BOM list: It is not a good idea to consider the total quantity required (considering 50 items of PCB assembly at a time). Instead, consider one PCB assembly item at a time, find out the type of PCB and the required components, list the part details of only one PCB assembly, and do the same for the following item. Ask your engineering team to divide the work and determine all required components. Send the list to your customer for verification after sort out.
Determine the BOM list for each item after a final discussion with your team and customers.
The BOM must show the “when”, “what”, and “how” questions related to the project.
So, never make a BOM list hastily because that will be easy to miss some components or get the wrong quantity. That will cost a lot of round-trip mail and waste much production time. But most companies will provide the BOM list format, so it is convenient to fill in. But, except BOM list, your PCB components must be accurate and functional, so cooperating with reliable PCB assembly manufacturers and service providers are crucial.
Steps in PCB BOM reverse engineering
The difficulty of the PCBA can be judged roughly according to the number of materials in the BOM list.
When you get the BOM list, you should check if the BOM are complete or not. Typically, the BOM list should have a part number, brand, tag number, quantity, packaging and description of components. What is indispensable are part number, amount and tag number. Without a part number, you don’t know what part it is. You don’t know where the part should be soldered in the PCB without a tag number. Without quantity, you don’t know how many parts you should solder in the PCB.
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