surface mount

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surface mount

A circuit board packaging technique in which the leads (pins) on the chips and components are soldered on top of the board. Boards can be made faster because surface mount technology (SMT) eliminates drilling holes for thru-hole devices, in which the pins go through the board and are soldered underneath.

Surface mount also allows the real estate under the device to be used for other layers by the board designer. In addition, the boards can be smaller because the chips are smaller; for example, SMT packages such as BGA have no leads extending out from the sides (see BGA). Contrast with socket mount and thru-hole.

Surface Mount Vs. Thru-Hole
Most chips are surface mounted to the circuit board, but some are thru-hole, in which the pins go through the board and are soldered underneath. With surface mounted chips and no holes drilled through the board, the real estate under the device can be used by the circuit board designer for other board layers.

Gull-Wing Surface Mounts
These are examples of the common gull-wing style of leads on surface mount chips. The leads extend slightly out from the package, then down and out again.

Discrete and Surface Mounted
Although most discrete resistors are thru-hole devices, these resistors are surface mounted to save space as well as time making the board.

Surface mount

General term for a fixture directly mounted on a ceiling. Many hold up to four bulbs and are used in hallways and bathrooms. Used primarily in rooms with low ceilings.
References in periodicals archive ?
Many designers like to use every square centimeter of the board, and knowing they can put surface mount components very close to plated through-holes, so long as they are perpendicular to the holes, will certainly make them happy.
Surface Mount Technology (SMT) Screen Printers and Glue Dispenser Market
Shober, vice president of Operations for TRiMEGA, noted that the Modular Surface Mount VMB can be configured to supply as many as 10 to 12 different process lines.
The component features surface mount lead configuration and a high- temperature plastic housing and rotor, enabling it to withstand infrared radiation (IR), convection solder reflow and high-pressure wash systems used in modern electronics production.
Included in the Low Voltage Surface Mount TMOS MOSFET Kit are the following:
In all, more than 350 companies will exhibit products and services for the surface mount and advanced electronics manufacturing industries during the conference.
Products include magnetics (discrete components, power transformers and MagJack[R]s), modules (DC-DC converters, integrated analog front end modules, custom designs), circuit protection (miniature, micro and surface mount fuses) and interconnect devices (passive jacks, plugs and cable assemblies).
This patented OSP process has been successfully utilized at AT&T's Richmond facility for over ten years on plated through hole products and is increasingly the process of choice on surface mount products.
surface mount multi-layer chip capacitors, surface mount tantalum capacitors, surface mount resistors and surface mount inductors); (2) array packages (CSP, BGA); (3) substrates and interconnects; and (4) hybrids.

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