Via In Pad - Conductive Fill or Non-Conductive Fill?

Very few fabricators offer conductive fill because the Vias may break (fracture) during lead free reflow (oven soldering) due to thermal coefficient differences between the conductive fill and the surrounding PCB materials.

Suggested reading: 

http://www.4pcb.com/TechTalk_Conductive_or_Non-conductive_VIP_Fill.pdf

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Convert 140 pSec/inch to pSec/cm - Google Search

Convert 140 pSec/inch to pSec/cm - Google Search:

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I-Connect007 :: Books

I-Connect007 :: Books:

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Common PCB Design Issues and Reasons for Circuit Board Failure

Common PCB Design Issues and Reasons for Circuit Board Failure:

Acid Traps

Plating Voids
Slivers
Insufficient Copper-to-Edge Clearance

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