According to JPCA (Japan Circuit Association)-ES-01-2003 standard: CCL with chlorine (Cl) and bromine (Br) content less than 0.09% Wt (weight ratio), respectively, is defined as halogen-free CCL (while CI+Br Total ≤0.15% [1500PPM]). Halogen-free PCBs are
Impedance affects how signals travel through the board, how power is transferred between components, and how signals penetrate into unwanted areas of the PCB.
What is Controlled Impedance? Controlled impedance is the characteristic impedance of the transmission line formed by the PCB traces and their associated reference planes.
Excellent electrical conductivity due to direct board connection and more gold thickness, strong wear resistance allows the PCB to be plugged and unplugged thousands of times, and the PCB pads use a hard gold plating process with good oxidation resistance
Raised corners, nicks, scratches, sink (spots) and tin stains, oxidation, exposed copper or exposed nickel, spot copper shavings, test pin spots.
Amplifier modules, also known as amplifier boards, are PCB (printed circuit board) modules that have audio amplifier chips.
Some of the substrate materials used in high voltage PCBs include: BT epoxy, phenolic cured rigid laminate, high voltage Teflon (HVPF).
Maintain clearance between high voltage drop traces. Avoid any sharp turns and edges as they can act as areas for concentrated electric fields. Avoid running very high voltage traces on the inner layers of the board.
The high-frequency material most familiar to users of PCB laminates is probably polytetrafluoroethylene (PTFE), a synthetic thermoplastic fluoropolymer with excellent dielectric properties at microwave frequencies.
FR4 is the most used material in PCB construction. Circuit boards made of FR4 are strong, waterproof, and provide good insulation between copper layers, minimizing interference and supporting good signal integrity.
The standard thickness of the PCB is 1.57 mm. Some manufacturers will accommodate other specific thicknesses of 0.78mm or 2.36mm. When we say "thick" or "thin" FR4, we are usually comparing to the standard thickness of 1.57mm.
The impedance of a circuit board trace depends on: trace width and thickness. The height of the dielectric layer between the signal trace and the reference plane. The dielectric constant of the dielectric material used in the circuit board.
