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January 2005

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dehoyos, Ramon
Date:
Fri, 28 Jan 2005 11:03:57 -0500
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        That is how the magnetic properties of ferrite material are created by aligning the molecules of it when it is in the pressence of a strong magnetic field. So if  ferrite material is exposed to a reversed field the magnetic field stregth can be changed.
        Regards,
        Ramon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Clyde Sprowl
Sent: Friday, January 28, 2005 9:41 AM
To: [log in to unmask]
Subject: Re: [TN] Rework with magnets


Not so. Magnetic field can ruin the Q of ferrite material. 


Clyde Sprowl
The Braun Corporation
574-946-4139 X3106

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Thursday, January 27, 2005 3:32 AM
To: [log in to unmask]
Subject: Re: [TN] Rework with magnets

Don't believe everything you hear. I cannot see how a magnetic field could affect any semiconductor or ferrite components, once it was removed. Yes, ferrites could become saturated with the magnet close by, but would revert to normal as the magnet was removed. I suppose any component using Hall effect may be affected (unlikely), but these don't grow on trees.

Brian

Arturo Medellin wrote:
> Hello everyone :
> 
>   In our  Process we have a  PCA  with shields covering components 
> like flash memories  and ICīs We tested different rework methods in 
> order to remove  the shields but we do not have successfully , 
> somebody told me that the magnets can help us , but my concern is that 
> the magnetism can delete  the information recorded in the flash memory 
> or  affect the frequencies in coils and transformer with ferrite core
> 
> does anyone  can help me to clarify my  concern
> 
>  Thanks in Advance
>   Arturo Medellin
> 
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