Multilayer PCB, Multilayer PCB Manufacturing
Multilayer PCB is a circuit board that has more than two layers. Unlike a Double-Sided PCB which only has two conductive layers of material, all multilayer PCBs must have at least three layers of conductive material which are buried in the center of the material.How Are Multilayer PCBs Made?Alternating layers of prepeg and
core materials are laminated together under high temperature and
pressure to produce Multilayer PCBs. This process ensures that air isn't
trapped between layers, conductors are completely encapsulated by
resin, and the adhesive that holds the layers together are properly
melted and cured. The range of material combinations is extensive from
basic epoxy glass to exotic ceramic or Teflon materials. The figure above illustrates the stackup
of a 4-Layer/ multilayer PCB. Prepeg and core are essentially the same
material, but prepeg is not fully cured, making it more malleable than
the core.The alternating layers are then placed into a lamination press.
Extremely high temperatures and pressures are applied to the stackup,
causing the prepeg to "melt" and join the layers together. After cooling
off, the end result is a very hard and solid multilayer board. Benefits of Multilayer PCBs (compared to single or double-sided PCBs)Higher assembly density Smaller size (considerable savings on space)Increased flexibilityEasier incorporation controlled impedance features.EMI shielding through careful placement of power and ground layers.Reduces the need for interconnection wiring harnesses (reduces overall weight)MOKO is an Experienced Multilayer PCB ManufacturerMOKO has been producing Multilayer
PCBs for over 15 years. Over the years, we have seen all types of
multilayer constructions from various industries, answered all types of
multilayer questions, and solved all types of problems with multilayer
PCBs.
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