Different Turn key PCB assembly result in many different PBC specifications and costs in printed circuit board prototyping and production. There are actually 1 or 2 layer boards which simply require on pre-preg “core” or multiple layer boards which use two or more varieties of cores in construction. Pre-preg, a material created from fine layers of fiberglass “pre-impregnated” by using a bonding agent or metal core in the sheet form, has many different measures according to the intended use and the desired thickness. The thickness of the board can differ coming from a couple mils thick for flex boards to some quarter inch thick for heavy burn in boards. Core materials resemble slim double-sided boards with dielectric materials like fiberglass together with a copper foil placed on both sides; these usually may be found in predefined thicknesses.
FR4, the most traditionally used group of substrates in printed circuit boards, is actually a glass fiber epoxy laminate. FR4 is regarded as the standard material with higher numbers (like FR4-06, FR4-08) have higher temperature coefficients and lower dielectric constants. FR4 has a starting Tg of 140 degrees Celsius, FR4-06 includes a Tg of 170 degrees so that as you progress up the household, the temperature increases.
Popular in Light Emitting Diode printed circuits boards, Metal Core has great heat elimination. A single layer MCPBC includes a metal base, usually an aluminum and non-conduction layer, a copper circuit layer, IC components as well as a solder mask. The metal core acts for an amazing heat sinks, to guarantee the safety from the LED’s.
Tougher than FR4, polyimide sustains hotter temperatures; it is then perfect for use within electrical insulation applications that match the class H requirements. The polyimide includes silicone adhesive design and also a polyimide film designed to withstand high temperatures. It protects edge connectors, gold edge fingers during wave soldering, and the reflow soldering processes during Heavy Copper PCB. Another interesting fact about polyimide may be the color. While many boards come out green in color, 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 do not carry the myth to be exotic anymore. PTFE/woven glass met1cor materials give both rapid growth and development of applications operations and meet high-frequency demands on a material that has availability and proven performance.
Use Arlon materials for the Metal Core PCB and frequency dependent printed circuit manufacturing. Common applications include those prone to high temperatures during processing like applications containing significant lifetime temperatures and lead-free soldering. These include under-hood automotive controls, down hole drilling, burn in boards, aircraft engine instrumentation and industrial sensors.
Advanced circuitry applications use Isola range, a high performance FR-4 epoxy laminate and pre-preg system. Isola’s low dielectric constant and low dissipation factor make the ideal material for broadband circuit designs that require a quicker signal speed and/or better signal integrity. Isola is additionally the leading manufacturer of Lead Free materials, their IS410 and 370HR are the main materials useful for ROHS compliant boards.