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March 2004

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 11 Mar 2004 07:15:29 -0800
Content-Type:
text/plain
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text/plain (119 lines)
        Carrie:
        I have always known to be 100 mills min off the board for 1 Watt or
greater component.  The greater the wattage the more heat they produce.
Unless there is a short and a little fellow burns out and takes part of the
board with it.
        Ramon

> -----Original Message-----
> From: Roger Stoops [SMTP:[log in to unmask]]
> Sent: Thursday, March 11, 2004 10:00 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Can't remember a darned thing!
>
> Actually, I believe the issue would be the operating temp of the component
itself in relation to the temperature at which the board material begins to
degrade or become damaged.  My memory tells me that if the operating temp at
the surface of a resistor exceeded 70deg C or so, we would stand the little
fella off the board a minimum of 1.5mm.  Then again, my memory may be just
as bad (or good) as yours...
>
> I also checked the CM-770 doc, but didn't find anything after a cursory
exam.
>
>
> Roger M. Stoops, CID+
> Trimble Navigation Ltd., Dayton, OH, USA
> Ph: +01 937.245.5288
> Fax: +01 937.233.7511
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Morse, Carrie
> Sent: Thursday, March 11, 2004 9:33 AM
> To: [log in to unmask]
> Subject: Re: [TN] Can't remember a darned thing!
>
>
> Phil,
> Real funny!
>
> Are you implying that YOU can't remember either, or that there is none?
> If there is none, was there ever one?  I thought it was in IPC-A-610B.
> Or maybe it was a military application from my old Raytheon days.  I was
> young then and probably would have remembered!
>
> -----Original Message-----
> From: Phil Nutting [mailto:[log in to unmask]]
> Sent: Thursday, March 11, 2004 9:30 AM
> To: TechNet E-Mail Forum.; Morse, Carrie
> Subject: RE: [TN] Can't remember a darned thing!
>
> Ooh, good question. There is a standard for this... cool!
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Morse, Carrie
> Sent: Thursday, March 11, 2004 9:27 AM
> To: [log in to unmask]
> Subject: [TN] Can't remember a darned thing!
>
>
> Since, for some reason, I can't remember a darned thing lately, I was
> wondering if someone could tell me WHERE within all of our IPC specs I
> can find where it specifies at what wattage we need to start raising
> resistors off the board (ex: 1W, 1.5W?)
>
> Thanks,
> Carrie
>
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