Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
PWB Materials
♦ Dozens of dielectric materials to chose from
- Rogers 20 types
- Taconic 10 types
- Polyclad 25 types
- Park Nelco 30 types
♦ Several dielectric thickness options
♦ Several copper thickness options
♦ Two copper plating options
- Rolled
- Electro-Deposited
---------- Post added at 21:09 ---------- Previous post was at 21:08 ----------
Electrical Considerations in
Selecting Materials
♦ Dielectric Constant (permittivity)
- The more stable, the better
- Lower values may be more suitable for high layer counts
- Higher values may be more suitable for some RF structures
♦ Loss Tangent
- The lower, the better
- Becomes more of an issue at higher frequencies
♦ Moisture Absorption
- The lower, the better
- Can effect dielectric constant and loss tangent
♦ Voltage Breakdown
- The higher, the better
- Typically not an issue, except in high voltage applications
♦ Resistivity
- The higher, the better
- Typically not an issue, except in low leakage applications
---------- Post added at 21:09 ---------- Previous post was at 21:09 ----------
Mechanical Considerations in
Selecting Materials
♦ Peel Strength
- The higher, the better
♦ Flammability
- UL Standards
♦ Glass Transition Temperature (Tg)
♦ Thermal Conductivity
- Typically PWB material is considered an insulator
- Thermal Clad (Bergquist)
- Planes & vias contribute to thermal conductivity
♦ Coefficient of Expansion
- XY matching to components, solder joint stress (LCC)
- Z axis expansion, via stress
♦ Weight (density)
♦ Flexibility
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
