Assembly Bill of Materials (BOM)

Bill of Materials is a list of all the parts that are needed for the PCB Assembly and matches those parts to the Reference Designators in the PCB layout. We require this list in a Microsoft Excel format. If multiple instances of the same part are used on one board,then they are all listed on one line of the BOM with their corresponding reference designators and total quantity. The following information comprises the BOM; incomplete BOMs may be acceptable, however, it is always best to include all of the following information in your BOM to minimize the risk of purchasing errors.

• Item # - Unique item number for each component (1, 2, 3)
• Ref Des – Matches BOM item to PCB layout location
• Quantity – Quantity of this component that will be needed for each board
• Manufacturer – The name of this component’s manufacturer
• Manufacturer Part # - The part number assigned to a component by its manufacturer
• Description – Brief component description
• Package – Packaging size (ex. 0805) or type (ex. BGA, QFN)
• Type – SMT or THT
• Your Instructions – Any special requirements that you have for this part

We provide a sample Bill of Materials on our website that may be used as a basis for your Bill of Materials.

                                                Figure 1: Assembled Printed Circuit Board

Click here to know more:What is a BOM and why is it important in PCB Assembly?
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