On Mon, 18 May 2009 19:26:58 -0400, Marcus D. Leech <[email protected]>
wrote:
Matt Ettus wrote:
Paul Mathews wrote:
Paul,
Thanks for your analysis of the situation. C73 and C74 are not
actually capacitors, they are, as you say, electrostatic discharge
protectors, part number PESD0402-060. I have not seen any fail in the
manor you mention, but I suppose enough static could cause that.
Has anyone else seen this failure mode?
Matt
Aren't ESD protectors usually MOVs, and don't MOVs usually fail by
shorting? They can absorb so many joules of ESD, and
after that they short out.
In live electrical power lines, this usually causes the breaker to trip.
The other type are GDTs, which fail open. But they don't fail very
often.
I used to work on power supplies some time ago. We had one particular
version with ESD protection on the output. They failed quite often, and
yes, they do short when they fail. I was never convinced that the devices
actually failed due to ESD, but more likely faulty manufacturing process.
Ryan
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