1.Stack-up

Stack-up refers to the arrangement of copper layers and insulating layers that make up a PCB prior to board layout design. While a layer stack-up allows you to get more circuitry on a single board through the various PCB board layers, the structure of PCB stack-up design confers many other advantages:

. A PCB layer stack can help you minimize your circuit's vulnerability to external noise as well as minimize radiation and reduce impedance and crosstalk concerns on high-speed PCB layouts.

. A good layer PCB stack-up can also help you balance your need for low-cost, efficient manufacturing methods with concerns about signal integrity issues

. The right PCB layer stack can enhance the Electromagnetic Compatibility of your design as well.

2. Why need stack-up?

Before designing a multi-layer PCB, designers need to first determine the circuit board structure based on the size of the circuit, the size of the circuit board, and the EMC requirements. That is, decide whether to use 4 layers or 6 layers. More layers of circuit boards. After the number of layers is determined, the placement of the inner layer and how to distribute different signals on these layers are determined.

Planning the multilayer PCB stack-up configuration is one of the most important aspects in achieving the best possible performance of a product. A poorly designed substrate, with inappropriately selected materials, can degrade the electrical performance of signal transmission increasing emissions and crosstalk and can also make the product more susceptible to external noise. These issues can cause intermittent operation due to timing glitches and interference dramatically reducing the products performance and long term reliability. In contrast, a properly built PCB substrate can effectively reduce electromagnetic emissions, crosstalk and improve the signal integrity providing a low inductance power distribution network. And, looking from a fabrication point of view, can also improved manufacturability of the product.

3. PCB HERO's Standard PCB Layer Stack-up

PCB HERO manufactures multilayer circuit boards with layers in the range from 4 to 14 layers, board thickness from 0.4mm to 3.0mm, copper thickness from 1oz to 4oz, inner layer copper thickness from 1oz to 2oz, and minimal spacing between layers to 4mil. Following images present PCB HERO's default layers stack-up of PCB service. If you don't require customized PCB layer stackup, we will make the multilayer PCBs according to our default layers stackup as below.

4,6,8 layer PCB standard stackup

PCB HERO Advanced PCBs common laminated structure design template