On the printed circuit board, the electrical connections of all components are made through pads. According to different components and welding processes, pads can be divided into two types: non-via pads and via pads.
Non-via pads are mainly used for soldering of surface mount components, and via pads are mainly used for soldering of stitched components.
So, what are the shapes of the pads? Next, please come to understand with the editor:
1. Round pad
In PCB proofing, circular pads are the most commonly used pads. For via pads, the main dimensions of a circular pad are the via size and the pad size, and the pad size is generally twice the size of the via. Non-via-type circular pads are mainly used as test pads, positioning pads, and reference pads, etc., and their main size is the pad size.
2. Rectangular Pad
There are two types of rectangular pads: square and rectangular. The square pad is mainly used to identify the first pin on the printed circuit board for mounting components. Rectangular pads are mainly used as pin pads for surface mount components. The pad size is related to the corresponding component pin size.
3. Octagonal Pad
The octagonal pad is rarely used in PCB proofing, and it is mainly set to meet the requirements of the wiring of the printed circuit board and the soldering performance of the pad.
4. Shaped pads
In PCB design, designers can use some special-shaped pads according to the specific requirements of the design.
In short, the choice of pad shape is related to factors such as the shape, size, layout, heating and force direction of components, and designers need to make choices after comprehensive consideration.
