To calculate the temperature rise you need to know a couple of things.....  What is the copper weight and the size of the trace that the 1.6 Amps went through.  In any case, if you still have continuity I think you are OK.  

Joe J. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Wednesday, May 04, 2005 3:04 AM
To: [log in to unmask]
Subject: Re: [TN] Accidental Short draws current

I would say that the energy contained in 0.16 A.s would cause no damage to a PCB: may be bad for semiconductors, though! We used to soak-test 3 close-spaced rows of PTHs, interconnected by 0.3 mm tracks, of diameters down to 0.4 mm drill size, with 6 A for 30 minutes to ensure integrity and rarely got a failure. However, these test coupons did get warm (I would guess 50 - 60°C from memory). In your case, there was not enough time for the conductor to heat up sufficiently to cause damage, even on HD structures.

Brian

Pete menuez wrote:
> All:
> 
> We had an assembly in test and one of the technicians accidently 
> probed a pad and shorted the probe to ground.  This drew about 1.6 
> amps (calculated) for about 100 miliseconds.
> 
> Is there a chart, guideline, calculation or something that will tell 
> me what damage would occur  to the internal trace/laminate with such 
> an event.
> 
> Thanks in advance,
> 
> Pete
> 
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