We require 0-5 micron etch back.
Gave the explanation previously.
Regards,
Gil



נשלח מסמארטפון ה-Samsung Galaxy שלי.


-------- הודעה מקורית --------
מאת: David Hillman <[log in to unmask]>
תאריך: 19.4.2018 16:43 (GMT+01:00)
אל: [log in to unmask]
נושא: Re: [TN] R: [TN] R: [TN] PCB failure

Hi Wayne - etchback isn't necessary for acceptable PTH reliability for some
products and product use environments so that may not be a contributing
issue. With that being said, I like etchback as it always makes the inner
connections better/more robust and in some product use environments having
etchback is necessary for long term product life. One question we haven't
asked as a group is " was etchback required in the fabrication
requirements?"

Dave

On Thu, Apr 19, 2018 at 9:11 AM, Wayne Showers <[log in to unmask]
> wrote:

> The real problem is that this PCB has no etchback, positive or negative
> (PCBs are defective).  As far as resin recession, yes the processing
> probably caused the separation, but once again, the PCB has no etchback.
>
> I would send that cross-section image to the PCB supplier and asked them
> if this is typical.  I suspect that they will realize it is a trap and
> either offer a crazy answer or admit that their is no etchback and offer to
> re-run/replace the PCBs.
>
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