In PCB design, PAD is a very important concept, PCB engineers must be familiar with it. However, although familiar, many engineers are only half – baked in the knowledge of pad. The types and design standards of pads in PCB design will be introduced in detail below.
Generally speaking, pads can be divided into 7 categories, which are distinguished according to their shapes as follows:
Square pad — the components on the printed board are large and few, and the printed wire is simple to use. When making PCB by hand, it is easy to use this type of pad.
Circular pad – widely used in single and double-sided printed boards with a regular arrangement of components. If the density of the board allows, the pad can be larger, welding will not fall off.
Island pad – the connection between the pad and the pad is integrated. Often used in vertical irregular alignment installation. For example, cassette recorders often use this type of pad.
Teardrop type pad – when the pad is connected to a thin wire, it is often used to prevent the pad from peeling and disconnect the wire from the pad. This pad is commonly used in high-frequency circuits.
Polygonal pad – used to distinguish between pad with close outer diameters and different apertures, easy to process and assemble.
Oval pad – these pads have enough area to enhance strip-resistance and are often used in double-line inserts.
Open-end pad – to ensure that after wave soldering, the hole of the manually repaired soldering pad is not closed by soldering tin.
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