OK, they have come back and changed the risk, it is to shield the IC
from IR. Not UV. Still not clear why it is an issue, but hey...
Graham Collins
Senior Process Engineer
Sunsel Systems
(902) 444-7867
On 8/2/2018 3:10 PM, Decker, Scott UTAS wrote:
> Well, the customer may always be right, but it doesn't make them smart... UV-A or UV-B, or just UV, That IS the question, but the answer may be, (from the responses so far) in the form of a question, why? <--I joint the question pool here. Your doping idea seems reasonable but will the material be thick enough to protect? A metal cap, as mentioned, may be a good answer if you can isolate it from the board with bonding materials, etc. Any vib or moisture/environment issues to be concerned with?
>
> And now to add to the list of jokes i.e. Sunburn, etc. I was not aware they made a BGA package for an UV - EPROM? Sounds like it could be more of a "At One Time It Was Programed" device and not an OTP... (drum taps and cymbal crash!) or for the more modern side (Mic Drop!) That has really got to be hard on a mic to do that...
>
> Good luck and maybe let us know what the final answer turns out to be.
>
> Scott Decker – Staff Engineer, PCB Design Services CID+ – Electronic Systems Center
> UTC AEROSPACE SYSTEMS
> 3445 S. 5th Street, Suite 170, Phoenix, AZ 85040 U.S.A.
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>
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
> Sent: Thursday, August 02, 2018 10:55 AM
> To: [log in to unmask]
> Subject: [External] Re: [TN] UV protection for an IC
>
> Don't know. They aren't explaining. The customer is always right!
>
> Graham Collins
> Senior Process Engineer
> Sunsel Systems
> (902) 444-7867
>
> On 8/2/2018 2:48 PM, David Hillman wrote:
>> Hi Graham - other than the bad sunburn jokes you will get on this, why
>> is there a concern for UV exposure?
>>
>> Dave Hillman
>> Rockwell Collins
>> [log in to unmask]
>> <mailto:[log in to unmask]>
>>
>> On Thu, Aug 2, 2018 at 12:34 PM, Graham Collins
>> <[log in to unmask] <mailto:[log in to unmask]>> wrote:
>>
>> Hello TechNet!
>>
>> I've got a customer who is looking to protect an IC from exposure
>> to UV. It is a tiny 24 ball BGA (2.3 mm square). They are
>> suggesting a dam and glob-top solution, but I'm concerned that
>> there isn't enough room around it (very, very small board). I've
>> suggested a dab of black conformal coating material on a brush.
>> Any other great solutions?
>>
>> --
>> Graham Collins
>> Senior Process Engineer
>> Sunsel Systems
>> (902) 444-7867
>>
>>
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