Contents
What do the letters on a PCB mean?
On a printed circuit board, I see lots of tiny letters and numbers. Is there some kind of standard that dictates what letter indicates what type of component? The technical term for the markings is “reference designators” (aka “refdes”) and there are a few standards can define them.
What are the common mistakes when designing a PCB?
Designers often make the mistake of designing buried or blind vias that are very hard to manufacture or cannot be manufactured at all. Fabricating with buried via or blind vias is a more costly process as compared to a regular through vias, this increases the total cost of the PCB.
What kind of routing is used in PCB design?
Routing is quite a significant step in PCB design and all the steps before it are all its preparations. When it comes to PCB design, routing calls for the most requirement. PCB routing can be classified into single-side routing, double-side routing and multi-side routing. Two routing methods are available: auto routing and interactive routing.
What are primary and secondary sides of PCB?
I need to understand something mentioned in guidelines ( Dave Jones and Spirent) called primary and secondary sides of PCB and secondary side components needs more spacing. Also some very good source of guidelines for volume production will be very useful. The primary side is the side which has most of the components, especially the ICs.
What makes up a printed circuit board or PCB?
One of the key concepts in electronics is the printed circuit board or PCB. It’s so fundamental that people often forget to explain what a PCB is. This tutorial will breakdown what makes up a PCB and some of the common terms used in the PCB world.
How is the transition temperature of a PCB determined?
Glass transition temperature, or Tg, is the temperature range in which a PCB substrate transitions from a glassy, rigid state to a softened, deformable state as polymer chains become more mobile. When the material cools back down, its properties return to their original states. Tg is expressed in units of degrees Celsius (ºC).
Why is TD important when assembling PCB substrates?
Like Tg, Td is expressed in units of degrees Celsius (ºC). A material’s Td is an important ceiling when assembling PCBs, because when a material reaches or surpasses its Td, changes to its properties are not reversible.