Through hole technology for pcb board from wonderful pcb

1. Through-hole Technology For PCB Board From Wonderful PCB
The process of electronic circuit design can cover systems ranging from complex
electronic systems all the way down to the individual transistors within an integrated
circuit. For more complex designs, teams of designers following a systematic
approach with intelligently guided computer simulation are becoming increasingly
common.
The PCB design process involves moving from the specification at the start, to a plan
that contains all the information needed to be physically constructed at the end, this
normally happens by passing through a number of stages, although in very simple
circuit it may be done in a single step.
The first PCBs used through-hole technology, mounting electronic components by
leads inserted through holes on one side of the board and soldered onto copper
traces on the other side. Boards may be single-sided, with an unplanted component
side, or more compact double-sided boards, with components soldered on both
sides. Horizontal installation of through-hole parts with two axial leads (such as
resistors, capacitors, and diodes) is done by bending the leads 90 degrees in the
same direction, inserting the part in the board (often bending leads located on the
back of the board in opposite directions to improve the part's mechanical strength),
soldering the leads, and trimming off the ends. Leads may be soldered either
manually or by a wave soldering machine.[30]
Through-hole PCB technology almost completely replaced earlier electronics
assembly techniques such as point-to-point construction. From the second
generation of computers in the 1950s until surface-mount technology became
popular in the late 1980s, every component on a typical PCB was a through-hole
component.
Through-hole manufacture adds to board cost by requiring many holes to be drilled
accurately, and limits the available routing area for signal traces on layers
immediately below the top layer on multilayer boards since the holes must pass
through all layers to the opposite side. Once surface-mounting came into use,
small-sized SMD components were used where possible, with through-hole
mounting only of components unsuitably large for surface-mounting due to power
requirements or mechanical limitations, or subject to mechanical stress which might
damage the PCB.

2. Ms. Jodie Zhou
Wonderful PCB
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