smt tht pcb design and manufacture
TRANSCRIPT
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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– (Verification by Final Simulation and Back
Annotation)
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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/Technologies
– 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 conductor also determines minimum dimensions.
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PCB Design and Manufacture
HXW-805BLayer 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 weeksPrice: $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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