We provide totally solution for LED lighting SMT PCB assembly. Worldwide Installation and on site support. Factory (machine and lighting assembly) training.

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Printed Circuit Board
Design
Example of
a Printed
Circuit
Board –
front and
back side

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PCB Design, Introduction
» For new electronic
products, designers are
key persons, but should
work in intimate
cooperation with:
– Sales, marketing and
customers
– Subcontractors
– Production process
experts
– Cost engineers
– Logistics and purchasing
staff
– etc.

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PCB Design
» Advanced PCB CAD tools a
neccessity
– Schematics
– Component Library
– Critical Parameters (Placement
Constraints, Electromagnetic
Compatibility, Thermal Limitations,
etc)
– Automatic Routing
– Final Touch Manual Routing

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PCB CAD tools,
» Output:
– Final Schematics
– Assembly Drawings
– Documentation for PWB Manufacturer (”Gerber”
file giving input for making PWB Manucturing
Data (See Chapter 5):
• Data for Photo- or Laser Plotter for Making
Photographic Films and Printing Masks
• Data for Numeric Drilling and Milling
Machines
• Data for Placement Machines
• Data for Test Fixtures and Testing Machines

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» Guidelines for Right
Quality
– Choice of Best Suited
Technology/Technologi
es
– Choice of
Components: Right
Compromise between
Performance,
Reliability, Cost, etc.
– Design for Production
– Design for Testability
– Design for Repair

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» Guidelines on Design for Manufacture
– Few layers
– Coarse pattern
– Standardisation
– Robust design (coarse tolerances)
– Orderly placement
Proper component placement for hole- and surface mounted components

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Orderly Placement
Proper component placement for hole- and surface
mounted IC components

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» Important Guideline for "Robust Design":
– Circuits should function with large parameter
tolerances:
• Design windows allowing for variations in
component parameters.
• Process windows allowing for variations in
each process step.
– Regulatory requirements on safety and EMC
should be passed within the specified design
and process windows.

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Design of THT and SMT
PCBs: Design Parameters
» Minimum Dimensions:
– The conductor cross
section areas and
resistivity of the material
determine maximum
current capacity and
thereby minimum
dimensions.
– Current capacity is
limited by excessive
heating of the conductors
and the PCB.
– Maximum allowed ohmic
voltage drop along the

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PCB Design and Manufacture
HXW-805B
Layer count ： Double side
Material:FR4/0.8
Puzzle size:96*75.9mm/6
Surface finished:OSP
Panel size: 45*21.9mm/1
Characteristics: Rogers multilayer PCB with impedance control
Lead time: 2 weeks
Price: $0.4/board FOB Shenzhen
HXW-805B

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PCB photo
from Gerber to Final

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PCB photo
from Gerber to Final

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PCB photo
Top / Bottom

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PCB in Processing

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PCB in Processing

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Welcome inquiry
1,Please visit : www.smthelp.com
2, Find us more: https://www.facebook.com/autoinsertion
3, Know more our team: https://cn.linkedin.com/in/smtsupplier
4, Welcome to our factory in Shenzhen China
5, Looking forward to your email: jasonwu@smthelp.com