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Electronic manufacturing industry PCB/PCBA knowledge

A PCB BOM (Bill Of Materials) provides a comprehensive list of all the components needed for the PCB assembly, including their part numbers, descriptions, quantities, and other relevant information, which serves as the foundationg for PCB Manufacturing or PCBA. A well constructed PCB BOM is vital to result in quality products.

Introduction to PCB BOM

PCB, a board with electronic components which are interconnected by conductive tracks, stands for printed circuit board. And PCB BOM, a list of all the components required to build a product, stands for bill of materials. Therefore, the PCB BOM refers to the bill of materials specifically for the printed circuit board. It includes a detailed list of all components needed for the PCB assembly, including their part numbers, descriptions, quantities, and other relevant information.

Table of Contents

How many types of BOM are there

There are different types of PCB BOM such as Engineering BOM (EBOM), Manufacturing BOM (MBOM), Service BOM (SBOM), Sales BOM (SABOM), and Product Structure BOM (PSBOM). Each type serves a specific purpose in the product lifecycle.

PCB BOM and its types

Why BOM is required

BOM, or Bill of Materials, is always required in manufacturing and production processes, because it can effectively ensure accurate planning, sourcing, and tracking of materials and components needed to manufacture products.

What is the purpose of PCB BOM

The purpose of PCB BOM is to provide a comprehensive list of all the components that are required to assemble a PCB. It includes critical information like the part number, manufacturer, quantity, and description of each component necessary for the assembly, along with their respective locations on the PCB.

Difference between BOQ and BOM

The most significant difference between BOQ and BOM is their purpose. BOQ is served to manage the costs of a construction project, while BOM is served to manage the components of a product. BOQ tends to be more detailed and exhaustive, listing everything from raw materials to services and equipment. On the other hand, BOM is more focused and straightforward, consisting of only the components necessary for the product.


BOQ and BOM are also differrent in terms of the level of detail. Because BOQ is a comprehensive document, it requires more detail than BOM. BOQ usually includes a list of materials broken down by section, each with its specification, measurements and quantities required. BOM, on the other hand, is a simpler document that lists each component by part number and quantity. Another point to note is that BOQ is mainly used in the construction industry, while BOM is used mostly in manufacturing. However, both documents have similarities and help to manage the resources required in any project or product.


In conclusion, the Bill of Quantity (BOQ) and Bill of Materials (BOM) both are critical documents that used in construction and manufacturing respectively. While they might sound similar, BOQ and BOM serve different purposes and differ in terms of detail and focus. Understanding the differences between BOQ and BOM rightly and clearly, it will be helpful to ensure that you use the right document for your project or product.

What is BOM components

The components of PCB BOM are necessary in any manufacturing process. Keeping an accurate record of the components in BOM ensures a smooth production process.

The components of PCB BOM include raw materials, finished products, and various equipments. PCB BOM components are essential in monitoring the inventory and ensuring timely replenishment. The components listed in PCB BOM are critically important to determine the final cost of the product.

The components of PCB BOM also include labor costs and transportation expenses. Efficient management of PCB BOM components is very important for maximizing profitability. A comprehensive understanding of the components in PCB BOM helps in effective production planning. BOM components also play a crucial role in maintaining consistent product quality. Accurately maintaining and updating the components of PCB BOM is crucial for compliance with regulatory standards.

How to bulid a PCB BOM

To build a PCB BOM:

1 Identify all the components on your PCB. This can be done by reviewing the design files or physically examining the board.
2 Create a spreadsheet with columns for part number, manufacturer, quantity needed, and any other relevant information (such as datasheets or reference designators).
3 Populate the spreadsheet with the information for each component.
4 Check with your manufacturer to ensure that the components on your PCB BOM are available and meet your specifications.
5 Update your PCB BOM as needed throughout the manufacturing process (for example, if a component becomes unavailable or a design change is made).
6 Provide the final PCB BOM to your manufacturer along with your other manufacturing files.

What’s standard BOM format

the standard PCB BOM (Bill of Materials) format may depend on the industry or company. However, the most common format includes a list of components or items required to manufacture a product, including part numbers, descriptions, quantities, and sometimes additional specifications like size,weight, and material. The PCB BOM can be in various formats, including Excel spreadsheets, CSV files, and ERP software.

Examples of BOM

An example of PCB BOM
Item | Quantity

Arduino UNO R3 | 1 pc
LED | 1 pc
220 ohm resistor | 1 pc
Jumper wires | 2 pc
Breadboard | 1 pc

This PCB BOM indicates the components needed to build a basic LED circuit using an Arduino board. It specifies the number and type of components required to complete the project.

How to check BOM material

1. Obtain the Bill of Materials (BOM) for the material in question.
2. Check that the PCB BOM is up-to-date and complete.
3. Identify all components listed in the PCB BOM.
4. Verify that all parts are available and in stock or can be ordered from a reliable supplier.
5. Ensure that all parts meet the required specifications and quality standards.
6. Review the PCB BOM to make sure it is accurate and matches the design requirements.
7. Confirm that the cost of the PCB BOM is within the budget constraints.
8. Update the PCB BOM as needed to reflect any changes to the materials or design.


In conclusion, a PCB BOM is an essential document that plays a crucial role in the manufacturing of PCBs. It ensures the smooth flow of the manufacturing process, provides accurate costing, helps maintain inventory levels, and ultimately results in quality products.


In PCB design, the bill of materials is a list of all the parts needed to manufacture a specific printed circuit board during the manufacturing process.

Manufacturer’s name, manufacturer’s part number, part description, component’s value, size/space occupied, product quantity, reference mark, placement method.

1、 It is the basis of computer identification of materials.
2、 It is the basis for preparing the plan.
3、 It is the basis of matching and receiving materials.
4、 It is the basis for tracking the processing process.
5、 It is the basis of purchasing and outsourcing.
6、 Calculation of product cost according to it.
7、 It can be used as a reference for quotation.
8、 To carry out material traceability
9、 Make the design serialized, standardized and generalized.

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