Different Turn key PCB assembly result in a number of PBC specifications and costs in printed circuit board prototyping and production. You can find 1 or 2 layer boards that require on pre-preg “core” or multiple layer boards which use 2 or more types of cores in construction. Pre-preg, a material made from fine layers of fiberglass “pre-impregnated” by using a bonding agent or metal core in a sheet form, has lots of different measures dependant upon the intended use as well as the desired thickness. The thickness of your board may differ from your couple mils thick for flex boards into a quarter inch thick for heavy burn in boards. Core materials resemble slim double-sided boards with dielectric materials for example fiberglass together with a copper foil put on either side; these usually come in predefined thicknesses.
FR4, the most traditionally used family of substrates in printed circuit boards, is a glass fiber epoxy laminate. FR4 is considered the most standard material with higher numbers (like FR4-06, FR4-08) have higher temperature coefficients and minimize dielectric constants. FR4 has a starting Tg of 140 degrees Celsius, FR4-06 carries a Tg of 170 degrees and as you progress your family, the temperature increases.
Popular in Light Emitting Diode printed circuits boards, Metal Core has great heat elimination. One particular layer MCPBC includes a metal base, usually an aluminum and non-conduction layer, a copper circuit layer, IC components and a solder mask. The metal core acts for an amazing heat sinks, so that the safety of the LED’s.
Tougher than FR4, polyimide sustains hotter temperatures; it is then well suited for utilization in electrical insulation applications that satisfy the class H requirements. The polyimide includes silicone adhesive design in addition to a polyimide film designed to withstand high temperatures. It protects edge connectors, gold edge fingers during wave soldering, and also the reflow soldering processes during Heavy Copper PCB. Another interesting fact about polyimide is the color. While most boards come out green colored, polyimide is easily distinguishable by its brown color.
PTFE/Woven glass base PCB materials require special drilling because in comparison with FR4 the Teflon is soft. These materials tend not to carry the myth to be exotic any more. PTFE/woven glass met1cor materials give both rapid expansion of applications operations and meet high-frequency demands with a material containing availability and proven performance.
Use Arlon materials for that Metal Core PCB and frequency dependent printed circuit manufacturing. Common applications include those prone to high temperatures during processing such as applications containing significant lifetime temperatures and lead-free soldering. Examples include under-hood automotive controls, down hole drilling, burn in boards, aircraft engine instrumentation and industrial sensors.
Advanced circuitry applications use Isola range, an increased performance FR-4 epoxy laminate and pre-preg system. Isola’s low dielectric constant and low dissipation factor produce the ideal material for broadband circuit designs which require a quicker signal speed or better signal integrity. Isola can also be the leading manufacturer of Lead Free materials, their IS410 and 370HR are definitely the main materials used for ROHS compliant boards.