Multilayer PCBs
A multilayer PCB is a circuit board with more than two conductive layers of material. Unlike a double-sided PCB, which only has two layers, a multilayer PCB must have at least three layers of conductive material buried in the center of the board.
How are multilayer PCBs made?
Alternating layers of prepreg and core materials are laminated together under high temperatures 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 is adequately melted and cured. The range of material combinations is extensive, from basic epoxy glass to exotic ceramic or Teflon materials.
Stack up for multilayer PCBs:
The following is the usual stack-up information(4,6,8, 4-layer pcb standard stack-up), which also can be used as a stack-up of impedances.
In other exceptional cases or advanced PCBs (you need to choose ” additional options” and custom stack up or control impedance):
1. if you need a custom stack up or control impedance, we will manufacture it according to your requirements.
2. After placing an order, we will calculate whether it meets the requirements based on the stack, material, and impedance information. Also, we will confirm with you.
4-layer pcb standard stack up / 6-layer pcb standard stack up / 8-layer pcb standard stack up.
The figure above illustrates the stackup of a 4-layer/ multilayer PCB. Prepreg and core are essentially the same material, but prepreg 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 stack, causing the prepreg to “melt” and join the layers together after cooling off—a very hard and solid multilayer board results.
Benefits of multilayer PCBs
Compared to single or double-sided PCBs
• Higher assembly density
• Smaller size (considerable savings on space)
• Increased flexibility
• Easier incorporation of controlled impedance features.
• Emi shielding through careful placement of power and ground layers.
• Reduces the need for interconnection wiring harnesses (reduces overall weight)
Applications of multilayer PCBs
While multilayer PCBs’ weight and space benefits are especially valuable for aerospace PCBs, multilayer PCBs are also beneficial to applications where “cross-talk” levels are critical. These are a few other applications using multilayer printed circuit boards:
| computers | file servers | data storage | signal transmission |
| cell phone transmission | cell phone repeaters | gps technology | industrial controls |
| satellite systems | hand held devices | test equipment | x-ray equipment |
| heart monitors | cat scan technology | atomic accelerators | central fire alarm systems |
| fiber optic receptors | nuclear detection systems | space probe equipment |
Experienced multilayer pcb manufacturer
We have been producing multilayer PCBs for over 12 years. Over the years, we have seen all types of multilayer constructions from various industries, answered all kinds of multilayer questions, and solved all sorts of problems with multilayer PCBs.
Mass production lead time
| lead time Level | Lead Time (Wroking days,ex-factory | |
| Urgent(Days) | Normal(Days) | |
| 1、2L | 3-7 | 8-10 |
| 4L | 7-10 | 12-14 |
| 6、8L | 9-14 | 15-18 |
| 10L and up | To be determined based on case | |
The above lead time is based on:
1. Conventional Material
2. All engineering consultations are confirmed.
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