How to Connect Two PCB Boards?

How to Connect Two PCB Boards?


If the printed circuit board needs to realize the predetermined function, the interconnection between PCB is necessary. This article will specifically introduce the connection method of two printed circuit boards.

How to Connect Two PCB Boards?
the two most common PCB connection methods

The printed circuit board must be interconnected according to the circuit schematic diagram to realize the predetermined function. If the connection is wrong, the entire circuit board will be invalid. The following are the two most common PCB connection methods.

Welding method

The advantages of this method are simple operation, low cost, high reliability, and can avoid failure caused by poor contact. This method is generally suitable for the case where the components have fewer external leads.

1. PCB wire welding

There is no need for any connectors, as long as the external connection points on the circuit board and the components or other parts outside the board are directly welded with wires.

The following points should be paid attention to when the interconnection of the circuit board is welded.

(1) The soldering wire pads should be as close as possible to the edge of the circuit board and arranged in a uniform size, which is conducive to soldering and maintenance.

(2) In order to improve the mechanical strength of the wire connection and avoid pulling off the pad or printed wire due to the wire being pulled. Drill holes should be drilled near the solder joints on the circuit board to allow the wires to pass through the soldering surface of the printed board and then insert the pad hole from the component surface for soldering.

(3) Arrange or bundle the wires neatly, and fix them to the board with wire clips or other fasteners to prevent the wires from breaking due to movement.

2. PCB cable welding

The two circuit boards are connected by a flat cable, which is reliable and not prone to connection errors, and the relative position of the two circuit boards is not restricted.

Connector connection method

In more complex instruments and equipment, connectors are often used for the connection. This "building block" structure not only guarantees the quality of mass production of products, but also reduces the cost of the system, and provides convenience for debugging and maintenance.

When the equipment fails, the maintenance personnel do not need to check the components (that is, check the cause of the failure and trace back to the specific components), as long as it is judged which board is abnormal, it can be replaced immediately. Eliminate faults within time, shorten downtime, and improve equipment utilization. The replaced circuit board can be repaired within ample time and used as a spare part after repair.

1. Printed board socket

In more complex instruments and equipment, this type of connection is often used. This method is to make a printed plug from the edge of the circuit board, and the plug part is designed according to the size of the socket, the number of contacts, the distance of the contacts, the position of the positioning hole, etc., to match the special circuit board socket.

When making the board, the plug part needs to be gold-plated to improve the wear resistance and reduce the contact resistance. This method is easy to assemble, has good interchangeability and maintenance performance, and is suitable for standardized mass production. 

The disadvantage is that the cost of the printed board is increased, the manufacturing accuracy and process requirements of the printed board are higher, and the reliability is slightly worse, often because the plug part is oxidized and the contact is poor. In order to improve the reliability of external connections, the same lead wire is often led out in parallel through the contacts on the same side or on both sides of the circuit board.

2. Standard pin connection

This method can be used for the external connection of printed boards, especially pin connections are often used in small instruments. The two printed boards are connected through standard pins. The two printed boards are generally parallel or perpendicular, which is easy to achieve mass production.

There are many ways to connect PCB, we have to choose flexibly according to different characteristics. If you want to get solutions about PCB after reviewing the above, welcome to get in touch with us.

As a professional PCB product supplier, we have accumulated many years of manufacturing and production experience in this field. Our strong R&D team and strict quality management system can provide you with high-quality products. We can also formulate effective solutions and provide thoughtful one-stop service according to customer needs. If you want to buy our high-quality printed circuit boards, please contact us immediately!