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March 2012

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From:
Victor Hernandez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 9 Mar 2012 07:53:41 -0600
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These pics are not surprising!   Typical I what I see.   IMHO, fab houses are too busy with production that QUALITY of process/product is not of concern.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Louis Hart
Sent: Friday, March 09, 2012 7:41 AM
To: [log in to unmask]
Subject: Re: [TN] RE: HDI PCB - micro-via

Thanks, Steve. I wonder if I missed your posting, Wee Mei? Victor, I got a look at everything twice.

My comments are:

Are these pictures taken from something to be sent to a customer, or from a development project? Customer must define requirements in the former case.

Since A-600 is supposed to be a support for 6012, the latter is to be called out on procurement documents. (This point has been a TechNet topic.)

A table in 6012 early defines plating requirements for blind microvias.

The contribution of 6016, beyond that of 6012, seems to me to be purely in the area of internal registration of microvias. At the 2011 APEX EXPO (I was unable to attend 2012), I heard 6016 is going to be absorbed by 6012. As I've been putting it to people, what we now call 'HDI circuit boards' will soon be called 'circuit boards'.

The first picture, apparently of an etched microvia, shows what seems to be to be a complex sequence of platings. Any comments that would enlighten me are welcome.

Two of the pictures show what appears to be a lenticular dielectric structure between the microvia-filling metal and cap plating. Does this represent some plating resist residue, some ultra-advanced technology, or something else?

Louis Hart

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Friday, March 09, 2012 7:26 AM
To: [log in to unmask]
Subject: [TN] RE: HDI PCB - micro-via

Hi Wee Mei!

 

I have your pictures posted:

 

http://stevezeva.homestead.com/first_microvia__1-2_.jpg

 

http://stevezeva.homestead.com/2nd_microvia__3-4_.jpg

 

http://stevezeva.homestead.com/microvia-1__9-10_.jpg

 

http://stevezeva.homestead.com/microvia-2__9-10_.jpg

 

http://stevezeva.homestead.com/buried_via.jpg

 

Maybe some Technetters can steer you in the right direction….

 

Steve

 

 

From: Lum Wee Mei <mailto:[log in to unmask]>  

Sent: Thursday, March 08, 2012 7:04 PM

To: Steve Gregory <mailto:[log in to unmask]>  

Subject: HDI PCB - micro-via

 

Steve,

 

I have never inspected any HDI PCBs before and was asked to perform inspection to them in accordance to IPC-A-600 and if necessary IPC-6012. I have no idea what I am looking for as I stare at those pictures which I randomly took from two of the cross-section buttons. I flipped through the whole IPC-A-600 and 6012 but not able to see any images/pictures that correspond to what I see. Also am I suppose to use 6012 or 6016 to assist in the inspection criteria? I am totally lost. 

 

Kindly post the pictures to TechNet so that some kind souls can help me out of this dark tunnel. J

 

Thanks and regards,

~wee mei~


DSO 40th Anniversary – Celebrating 40 years of Serious Fun. 1972 – 2012 


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