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November 2018

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Subject:
Re: Immersion gold thickness per 4552
From:
Steven Kelly <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steven Kelly <[log in to unmask]>
Date:
Thu, 8 Nov 2018 19:38:46 +0000
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Thank you - that makes a lot of sense- these are all very small pads. Regards Steve Kelly



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Showers

Sent: November-08-18 2:34 PM

To: [log in to unmask]

Subject: Re: [TN] Immersion gold thickness per 4552



I was one of the main drivers for ensuring that the cautionary note for Gold in excess of 5 microinches was flagged.  If you are getting such high variability, I suggest doing two things then re-measuring. 

1) Are the pads being measured at least 60mils x 60 mils (1.5mm x 1.5mm)?  If not, the values may be off due to additional e saturation coming from the wrapped edges.

2) is your aperture sized smaller than the pads be measured?  If not, select an aperture size smaller than the pad being measured.

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