Anatomy of a PCB Design > Parts > Footprints (Land Patterns)

PCB pads are areas of exposed metal (usually copper) on a printed circuit board (PCB) designed to connect and secure electronic components.

Pads are where the component pins or leads are soldered onto the board, providing both a mechanical and electrical connection.

There are two main types of pads on PCBs:

Through-Hole Pads

Used for through-hole components with pins or leads that go through holes in the PCB. These pads are typically circular or rectangular and have a hole in the middle where the component’s leads pass through. The leads are then soldered on the opposite side of the board.

Surface-Mount Pads

Used for surface-mount components (SMDs) that sit directly on the PCB surface. These pads do not have holes and are designed to provide a surface where the component’s pins or leads can be soldered directly.

Key Functions of PCB Pads

Electrical Connection

Pads provide the point where the component's leads are electrically connected to the PCB, allowing signals and power to flow through the board.

Mechanical Support

Pads serve as the anchor points for components, ensuring they stay in place and are properly aligned.

Heat Dissipation

Pads can also help dissipate heat generated during soldering or by components.

Pads are a critical part of PCB design, ensuring both functional and structural integrity of the circuit.