What is HDI boards?
What is HDI boards?
A High Density Interconnector. HDI PCB is defined as a PCB with a higher wiring density per unit area than standard PCB. They have finer lines and spaces, smaller vias and capture pads and higher connection pad density than employed in conventional PCB technology. HDI PCB is used to reduce size and weight, as well as to enhance electrical performance of the device. also it is made through Microvia and buried vias and sequential lamination with insulation materials and conductor wiring for higher density of routing.
HDI Benefits
There are a lot of advantages with HDI PCB, such as small size, high speed and high frequency. It is the main components of personal computers, portable computers, mobile phones and personal digital assistants. At present, except mobile phones, also widely used in a variety of other consumer products, such as game consoles and MP3 ,laptops, etc.
Via in Pad Process
The via in pad process allows for vias to be placed within the surface of the flat lands. The via is plated and filled with either conductive or non-conductive epoxy then capped and plated over, making it virtually invisible.
Sounds simple but there is an average of eight additional steps to complete this unique process. Specialty equipment and trained technicians follow the process closely to achieve the perfect hidden via.
Cost Benefit
It is possible to reduce an 8 layer through-hole PCB to a 4 layer HDI micro-via technology packed PCB. The wiring capabilities of a well-designed HDI 4 layer PCB can achieve the same or better functions as that of a standard 8 layer PCB.
Although the micro-via process increases the cost of the HDI PCB, the proper design and reduction in layer count reduces cost in material square inches and layer count more significantly
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