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May 2009

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From:
Robert Kondner <[log in to unmask]>
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Date:
Thu, 14 May 2009 15:03:17 -0400
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Inge,

  Is Electric Field really the issue or is it more of a case of induced
currents?

  If I rub a piece of plastic with wool so It has a very high field, and if
I then set an IC on that plastic, will any current flow anywhere?

  If not then I do not see how the IC can be damaged.

  If I take a 1.5 volt battery and connect it to power and signal pins will
current flow? I think so and the part will probably be destroyed.

 So is it field or induced current levels?

Thanks,
Bob Kondner

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Thursday, May 14, 2009 2:49 PM
To: [log in to unmask]
Subject: Re: [TN] Bare PCB Packaging Requirements

Electrostatic fields can be induced in high dielectrics and once there, may 
be hard to get rid of. As little as 50 VDC can be a problem for IC chips 
without enough I/O diode protections. We have had some issues which might 
have been caused by such surface charges, but we could never prove it. To be

sure , we demand ESD safe bags. Additional cost negligible.
Inge

----- Original Message ----- 
From: "John Parsons" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, May 14, 2009 8:36 PM
Subject: [TN] Bare PCB Packaging Requirements


> Tell us, how many CEM's out there are demanding that bare PCB's be 
> received
> in vacuum sealed moisture barrier anti-static bags.  If so, what is your
> reasoning?  Just to be clear my focus here is "anti-static" not the 
> moisture
> barrier properties of the packaging.
>
>
>
> Regards
>
>
>
> John Parsons
>
>
>
>
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