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.
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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.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
High-temperature plastics are necessary because of the way the surface mount trimming potentiometers are attached to the PC boards.
The surface mount feedback oscillator circuit uses an inexpensive silicon MMIC amp to supply gain to the feedback loop, and a single YIG resonator bandpass filter as the frequency determining network.
Surface mount technology for consumer electronica application is expected to grow at the highest CAGR
The NUVA33 series features multiple UV LEDs in a surface mount package that is 3.40 x 3.40 x 2.37mm in size.
The revision introduces land pattern design guidance and rules for new surface mount component families such as electrolytic aluminum capacitors; small outline diode, flat lead; small outline transistor, flat lead, and dual flat no-lead devices.
Avago Technologies, a supplier of analogue interface components for communications, industrial and consumer applications, announced on 12 November that its single and dual-digit seven segment surface mount displays are now available.
The Company is also prepared to offer lead-free packages for its new 1 Mbit product family including traditional 32 pin packages and the new, smaller 48 pin surface mount package that supports additional, innovative functionality designed into the 1 Mbit architecture.
The ESM-3070 series of surface mount GaP LEDs are suited for flat profile packaging designs.
The new switches are compatible with pick-and-place machinery and conventional surface mount soldering processes.
Raychem Corporation (NYSE:RYC), Menlo Park, Calif.,has introduced 19 new PolySwitch(R) resettable fuses that greatly extend the breadth of the PPTC (polymeric positive temperature coefficient) surface mount device product line.
The MMCX surface mount series has been introduced to provide an engineer with the versatility and also the wide choice of mating connectors from an industry standard that are widely used on printed circuit boards (PCB).

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