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Thermal pads can be seen in several locations on this printed circuit board (PCB), in particular, the bottom pad of the three vertical pads in the top left corner. A thermal relief pad, thermal pad or simply thermal, is a printed circuit board (PCB) pad connected to a copper pour using a thermal connection. It looks like a normal pad with ...
28-pin QFN, upside down to show contacts and thermal/ground pad. Flat no-leads packages such as quad-flat no-leads (QFN) and dual-flat no-leads (DFN) physically and electrically connect integrated circuits to printed circuit boards.
In computing and electronics, thermal pads (also called thermally conductive pad or thermal interface pad) are pre-formed rectangles of solid material (often paraffin wax or silicone based) commonly found on the underside of heatsinks to aid the conduction of heat away from the component being cooled (such as a CPU or another chip) and into the heatsink (usually made from aluminium or copper).
Some QFP packages have an exposed pad. The exposed pad is an extra pad underneath or on top of the QFP that may act as a ground connection and/or as a heat sink for the package. The pad is typically 10 or more mm 2, and with the pad soldered down onto the ground plane, heat is passed into the PCB. This exposed pad also gives a solid ground ...
In printed circuit board (PCB) design, a via consists of two pads in corresponding positions on different copper layers of the board, that are electrically connected by a hole through the board. [citation needed] The hole is made conductive by electroplating, or is lined with a tube or a rivet.
Thermal pad can have the following meanings: Sleeping pad, a thin layer of insulating material placed under a hiker's sleeping bag; Thermally conductive pad, a pad made of heat-conducting material applied to a heatsink; Thermal relief, a pad on a printed circuit board connected to surrounding copper with a thermal connection