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Pcb assembly service that are provided by companies In assembly the bare board is populated with electronic components to form a functionalprinted circuit assembly(PCA), sometimes called a "printed circuit board assembly" (PCBA).
Inthrough-hole technologycomponent leads are inserted in holes.Insurface-mount technology(SMT) the
components are glued onpadsorlandson the surfaces of the PCB.
In both component leads are then mechanically fixed and electrically connected to the board bysoldering.
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There are a variety ofsolderingtechniques used to attach components to a PCB.High volume production
is usually done withSMT placement machineand bulk wave soldering orreflow ovens, but skilled
technicians are able to solder very tiny parts (for instance 0201 packages which are 0.02 in.by0.01in.)
by hand under amicroscope, using tweezers and a fine tipsoldering ironfor small volume prototypes.
Some parts cannot be soldered by hand, such asBGApackages.
Often,through-hole and surface-mount construction must be combined in a single assembly because some
required components are available only in surface-mount packages, while others are available only in
through-hole packages. Another reason to use both methods is that through-hole mounting can provide
needed strength for components likely to endure physical stress, while components that are expected
to go untouched will take up less space using surface-mount techniques.For further comparison,
see theSMT page.
After the board has been populated it may be tested in a variety of ways:
While the power is off,visual inspection,automated optical inspection.JEDECguidelines for
PCB component placement,soldering,and inspection are commonly used to maintainquality control
in this stage of PCB manufacturing.
While the power is off,analog signature analysis,power-off testing.
While the power is on,in-circuit test, where physical measurements (for example, voltage) can
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