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 that require on pre-preg “core” or multiple layer boards which use two or more forms of cores in construction. Pre-preg, a material made of fine layers of fiberglass “pre-impregnated” by using a bonding agent or metal core in the sheet form, has lots of different measures according to the intended use as well as the desired thickness. The thickness of your board may differ from the 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 positioned on both sides; these usually come in predefined thicknesses.
FR4, the most traditionally used family of substrates in printed circuit boards, is really a glass fiber epoxy laminate. FR4 is the most standard material with higher numbers (including FR4-06, FR4-08) have higher temperature coefficients and minimize dielectric constants. FR4 has a starting Tg of 140 degrees Celsius, FR4-06 features a Tg of 170 degrees so when you progress the household, the temperature increases.
Popular in Light Emitting Diode printed circuits boards, Metal Core has great heat elimination. One particular layer MCPBC has a metal base, usually an aluminum and non-conduction layer, a copper circuit layer, IC components along with a solder mask. The metal core acts as being an amazing heat sinks, to be sure the safety of the LED’s.
Tougher than FR4, polyimide sustains hotter temperatures; this will make it perfect for use in electrical insulation applications that match the class H requirements. The polyimide includes a silicone adhesive design and also a polyimide film designed to withstand high temperatures. It protects edge connectors, gold edge fingers during wave soldering, as well as the reflow soldering processes during Heavy Copper PCB. Another interesting fact about polyimide will be the color. While most boards turn out green colored, polyimide is easily distinguishable by its brown color.
PTFE/Woven glass base PCB materials require special drilling because when compared with FR4 the Teflon is soft. These materials will not carry the myth to be exotic any more. PTFE/woven glass met1cor materials give both rapid growth and development of applications operations and meet high-frequency demands on a material which includes availability and proven performance.
Use Arlon materials for the Metal Core PCB and frequency dependent printed circuit manufacturing. Common applications include those susceptible 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, 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 that require a faster signal speed or better signal integrity. Isola is additionally the top manufacturer of Lead Free materials, their IS410 and 370HR will be the main materials used for ROHS compliant boards.