PCB design space constraint problem

[simbaliya]

I need to design a very small PCB around 5mm x 20mm, double side, four layers. I face lots of difficulties in placing and routing the components, especially those big IC (4mm x 4mm) with 20 pins. Besides, the through plate vias have occupied too much of the space. Can anyone teach some tips to design a highly space efficient PCB?

 

[Kick]

1.Try to change that IC with small size.

2. Place some components on the bottom side.

3. place components too close(but avoid overlapping)

 

[senilicus]

You cannot shrink your components so you have to shrink the via's and traces in order to layout the board.

- use smaller via's
- use blind via's ( laser via)
- use buried via's
- use smaller traces/clearances (0.1mm/0.1mm)or even smaller. Make sure that the pcb manufacturer can do this.
- use (laser) via in pad. Don't forget to fill the via otherwise you will have serious assembly issue's

good luck

 

[marce]

post pictures

 

[rube]

1.Try to place all components to only one side, another side can route trace.

2. Change via size.

3. Power plane can route a little trace.

4.one side only route vertical trace, another side only route horizontal trace.