What is the Difference B/W Hatch Cu and normal Cu in PCB ?

Hello....

What is the Difference between Hatch Copper plane and normal Copper plane in PCB? Why do we go for Hatched Copper planes? What is the advantage of that?

With Thanks

Re: What is the Difference B/W Hatch Cu and normal Cu in PC

Hello all.....
Its urgent......Help

Re: What is the Difference B/W Hatch Cu and normal Cu in PC

Hatched plane does not sink thermally as much as full plane. It also does not carry as much current as well. Try to desolder some elkos on MOBO and you'll get idea of how good heatsink full plane is. This can be solved with thermal releifs at pads. Also capacitance to other layers is much higher in full plane case then in hatched. This might be desirable or not, dependant on design. Auto fill functions often use hatching or lines as method of filling required spaces. Hope it helps.

Re: What is the Difference B/W Hatch Cu and normal Cu in PC

AFAIK when you have a board that has lots of fine tracks on a layer, if you put solid ground plane in the un-used spaces, this can cause etching problems, also heat problems when going through processes.

For etching (home prototypes) , what can happen is that while etching if you have a fine track running near to lots of copper you can find the fine track etches away before the copper edge.

If say you have fine tracks & SMT on one side and then solid ground plane all over the other side and you put this board through a heating process, what can happen is the board will warp/bend because of an imbalance in the copper on each side.
Changing the ground plane to hatched can reduce/improve this problem.

A hatched ground plane will perform quite well for EMC (unless your into the Ghz ranges).

I have used hatched often (Esp on double sided SMT boards), but I always add little bits of copper around pads & vias or ensure that they are within the square of the hatches to ensure they have the maximum amount of copper attaching to them.

Roland.

Re: What is the Difference B/W Hatch Cu and normal Cu in PC

another point, hatched planes are resonant on some frequencies, solid planes are not...

Re: What is the Difference B/W Hatch Cu and normal Cu in PC

Hi,

Check this web site for more information in addition to all other replies you received,http://www.emchome.net/article.php/3095

it will answer ur queries to great extent,hope this will help u.


Regards

Ramesh