CONTENTS What is a PCB Materials of a PCB Parts of a PCB 1Components 2 Pads 3 Traces 4 Layers 5 Jumper 6 Solder Mask ID: 798441
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Slide1
“PCB”
-
AMIT NIKAM
-ASHI NAGARIYA
Slide2CONTENTS
What is a PCB?
Materials of a PCB
Parts of a PCB
1.Components
2. Pads
3. Traces
4. Layers
5. Jumper
6. Solder Mask
7. Silk screen
Multilayer PCB
Advantages
Disadvantages
Uses
References
Slide3What is a PCB?
Printed Circuit Board
Electronic Board that connects circuit components
PCB is populated with electronic components
PCBs are rugged, inexpensive, and can be highly reliable
Mass manufacturing
Slide4MATERIALS OF PCB
Conducting layers are typically made of thin copper foil.
The board is typically coated with a solder mask that is green in color. Other colors that are normally available are blue and red.
Unwanted copper is removed from the substrate after etching leaving only the desired copper traces or pathways
Slide5PARTS OF A PCB
Components
Pads
Traces
Layers
Jumper
Solder Mask
Silk screen
Slide6COMPONENTSComponents are the actual devices used in the circuit.
This includes input/output connections.
I/O ports, including power supply connections, are also important in the PCB design.
Slide7PADSLocation that components connect to.
You will solder components to the pads on the PCB.
Pads will connect to traces.
Pads have an inner diameter and outer diameter.
Slide8TRACESTraces connect pads together.
Traces are essentially the wiring of the PCB.
Equivalent to wire for conducting signals
High current traces should be wide
Signal traces usually narrower than power or ground traces.
Slide9Slide10LAYERS
Two layers- TOP and BOTTOM
Most of the components reside on the top layer
Fewer traces on the top layer
Components are soldered to the pads on the top layer of PCB
Higher circuit densities
Most soldering done on bottom layer
Slide11JUMPERSOften, many signal wires need to exist in too small of a space and must overlap.
Running traces on different PCB layers is an option.
Multilayer PCBs are often expensive.
Solution: use jumpers
Slide12SOLDER MASK
Protect copper traces on outer layers from corrosion
Areas that shouldn't be soldered may be covered with polymer resist solder mask coating
Designed to keep solder only in certain areas
Prevents solder form binding between conductors and thereby creating short circuits
Slide13Slide14SILK SCREEN
Printing on the solder mask to designate component locations
Readable information about component part numbers and placement.
Helpful in assembling, testing and servicing the circuit board
Slide15MULTILAYER PCBS
More then a top and bottom layer.
Typically there will be a power plane, ground plane, top layer, and bottom layer.
Sometimes signal layers are added as needed.
Slide16Slide17ADVANTAGES
Small
Compact
Contained in a convenient, rugged board
The circuit board fabrication cost (
pcb
cost) is lower with mass
quantity
production.
Electronic circuit characteristics
are maintained with
a proper circuit board design.
Component wiring and assembly can be mechanized in a circuit
board manufacturing facility.
PCB’s offer uniformity of electrical characteristics from assembly to
assembly.
The location of electronic parts is fixed and so it simplifies
components identification and maintenance of equipment.
Inspection time is reduced because printed circuitry eliminates the
probability of error.
Chances of
wrongly wiring
or short-circuited wiring are minimized.
Slide18DISADVANTAGES
Re designing is required for the new type of circuit operation.
Very
hard to get repaired if it gets damaged
.
We can not update it , once printed.
Etching of this PCB generates chemicals which are the
harmful
for the environment.....
Slide19USES
Industrial PCB Manufacturing
Some examples of PCBs that
Tabtronics
has manufactured for industrial use include:
Controls for ultrasonic technologies
Flex circuits with piezoelectric transducers
Field controls for water treatment systems
Process thickness measurement control
Slide20Medical PCB ManufacturingSome examples of PCBs that Tabtronics has manufactured for medical use include:
Dosimeter product assembly
2-axis body movement tracking device used by doctors and researchers
Eye measurement product with
remote transmitter and receiver
Hospital inventory control devices
Slide21REFERENCES
www.pcbexpress.com
A Practical Guide to high-speed printed circuit board layout