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2. Solder paste - Wikipedia

   en.wikipedia.org/wiki/Solder_paste

   Solder paste is used in the manufacture of printed circuit boards to connect surface mount components to pads on the board. It is also possible to solder through-hole pin in paste components by printing solder paste in and over the holes. The sticky paste temporarily holds components in place; the board is then heated, melting the paste and ...

3. Printed circuit board - Wikipedia

   en.wikipedia.org/wiki/Printed_circuit_board

   Not to be confused with Printed electronics. For other uses, see PCB (disambiguation). "PC board" redirects here. For the mainboard of personal computers, see Motherboard. "Panelization" redirects here. For the page layout strategy, see N-up. Printed circuit board of a DVD player Part of a 1984 Sinclair ZX Spectrum computer board, a printed circuit board, showing the conductive traces, the ...

4. Surface-mount technology - Wikipedia

   en.wikipedia.org/wiki/Surface-mount_technology

   Where components are to be placed, the printed circuit board normally has flat, usually tin-lead, silver, or gold plated copper pads without holes, called solder pads. Solder paste, a sticky mixture of flux and tiny solder particles, is first applied to all the solder pads with a stainless steel or nickel stencil using a screen printing process.

5. Ball grid array - Wikipedia

   en.wikipedia.org/wiki/Ball_grid_array

   A grid array of solder balls on a printed circuit board after removal of an integrated circuit chip. Cross-cut section of BGA mounted circuit. A ball grid array (BGA) is a type of surface-mount packaging (a chip carrier) used for integrated circuits. BGA packages are used to permanently mount devices such as microprocessors.

6. Pin header - Wikipedia

   en.wikipedia.org/wiki/Pin_header

   Normally pin headers are through-hole devices (THD/THT), but surface-mount devices (SMD/SMT) exist too. In the SMD case, the solder side of the pins are bent on a 90-degree angle so as to be soldered to pads on the printed circuit board (PCB). On single row SMD headers the pins are bent alternating to one side or the other, on dual row SMD ...

7. Through-hole technology - Wikipedia

   en.wikipedia.org/wiki/Through-hole_technology

   Through-hole (leaded) resistors. In electronics, through-hole technology (also spelled "thru-hole") is a manufacturing scheme in which leads on the components are inserted through holes drilled in printed circuit boards (PCB) and soldered to pads on the opposite side, either by manual assembly (hand placement) or by the use of automated insertion mount machines.