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PICList Thread
'Re[2]: UV Pic problem (use a hairdryer!!!)'
1996\12\19@114459 by Craig Knotts

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    The bulbs need to be replaced every few hours?  I've been using the
    same eraser for YEARS on almost a daily basis and it still works fine!

    I don't have any problem with heat buildup, and I have had very little
    problem erasing 16C5x parts with about 45 minutes exposure.  I might
    be able to go shorter, but I haven't done much experimenting in that
    area.

1996\12\19@211236 by Jim Robertson

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At 09:05 AM 12/19/96 -0500, you wrote:
>     The bulbs need to be replaced every few hours?  I've been using the
>     same eraser for YEARS on almost a daily basis and it still works fine!
>
>     I don't have any problem with heat buildup, and I have had very little
>     problem erasing 16C5x parts with about 45 minutes exposure.  I might
>     be able to go shorter, but I haven't done much experimenting in that
>     area.


45 minutes to erase a 16C5x part? 2 or 3 minutes (for the _5X_ parts) is to
be expected on a reasonable eraser. May be you should be doing some more
experimenting or perhaps you do have a problem after all.

Jim

1996\12\19@222029 by Lynn Richardson

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There's considerable variation in eraser UV intensity, distance from the
bulb surface to the silicon is critical.  The $39.95 DataErase (?) from
DigiKey puts the chip on top of the bulb, separation about .05 inches, and
will take about 4 minutes to make a 16C71 read erased but you should give
it an extra 4 minutes to get a good erase.  The older style erasers had
the bulb about a half inch above the chip and would take 30-45 minutes to
get a read-back as erased, so 60 minutes isn't out of line here.

The low presure mercury vapor bulbs used in most erasers will last several
thousand hours.  The Xenon flash erasers which can erase an eprom in
5 to 10 seconds use bulbs with a few hours lifetime.



On Fri, 20 Dec 1996, Jim Robertson wrote:

{Quote hidden}


'Re[2]: UV Pic problem (use a hairdryer!!!)'
1997\02\05@052406 by Brian Boles
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    One minor problem with erasing OTP with a 450 deg bake...

    You'll have a puddle of melted/burned plastic package and aluminum
    leadframe at the bottom of your oven!

    Rgds, Brian.


______________________________ Reply Separator _________________________________
Subject: Re: UV Pic problem (use a hairdryer!!!)
Author:  "Miller; Steve" <spam_OUTstevemTakeThisOuTspamTANISYS.COM> at Internet_Exchange
Date:    2/4/97 7:20 AM


Brian wrote:

{Quote hidden}

Does this mean that we can subject OTP parts to 842 degrees F (450 C)
and erase them?
I do some work with PICs and a lot of work with ZILOG.  I go through a
ton of ZILOG OTPs in development.  I would be happy to be able to erase
and reuse just a fraction of these chips.
If this is possible, please post the bake times required.  Thanks.

----- Steve

1997\02\05@074617 by Mike

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At 08:48 AM 4/02/97 -0700, you wrote:
>     One minor problem with erasing OTP with a 450 deg bake...
>
>     You'll have a puddle of melted/burned plastic package and aluminum
>     leadframe at the bottom of your oven!
>
>     Rgds, Brian.

OK then but, what is the situation if we select a temperature just below
the Epoxy melt and the bond soldering etc. Will the device still erase
over a 'longer' period of time ?

Could you provide us with a graph of the diminishing return ?

Rgds

Mike

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