Footprint for WLCSP package

[arunmaran10]

Hi all,
I want to know the size of micro via for .265mm pad and .4mm pitch WLCSP package.
For the same i want to know whether via on SMD pad is possible if so what will be the dia of that micro via.

Regards,
Arunmaran

 

[KlausST]

Hi,

Best is to go to the chip manufacturer's homepage ( if not in the datasheet) and find it's pcb layout recommendations.
Or go for IEC standards.

Klaus

 

[marce]

IEC standards!!!!
The footprint standard for surface mount devices is IPC-7351 if you are serious about PCB design I would recommend getting to know this standard.

As to microvias, generally based on a 0.1mm pad with a 0.3mm target area...in your case and mine in the past I have done a micro via with a land the same size as the width of the pad for the device and talked very nicely to my PCB manufacturer, it is doable.