Power mosfet question

M

Michael Kennedy

Guest
I have a power mosfet that was shorted.. Due to my carelessness...

A very fine sliver of solder bridged the gate to the drain. Would this
usually destroy the said mosfet? Or something else in line with it??

Its a K3556... Is there a simple test for these? The drain pin was cut
off, but enough left to make a very fine solder bridge... ughh...
 
"Michael Kennedy" <mike@nospam.com> wrote in message
news:fImdnSKviKex8QrRnZ2dnVY3goqdnZ2d@giganews.com...
I have a power mosfet that was shorted.. Due to my carelessness...

A very fine sliver of solder bridged the gate to the drain. Would this
usually destroy the said mosfet? Or something else in line with it??

Its a K3556... Is there a simple test for these? The drain pin was cut
off, but enough left to make a very fine solder bridge... ughh...
Click to expand...

Well scratch that.. If I'm holding the volt meter on the gate side of the
mosfet while starting up it will work... i guess I have to trace back and
see whats burnt up..
 
Michael Kennedy wrote:

I have a power mosfet that was shorted.. Due to my carelessness...

A very fine sliver of solder bridged the gate to the drain. Would this
usually destroy the said mosfet? Or something else in line with it??

Its a K3556... Is there a simple test for these? The drain pin was cut
off, but enough left to make a very fine solder bridge... ughh...


yup. That would pretty much forward bias that fet beyond max!
Click to expand...
 
Michael Kennedy wrote:

"Michael Kennedy" <mike@nospam.com> wrote in message
news:fImdnSKviKex8QrRnZ2dnVY3goqdnZ2d@giganews.com...

I have a power mosfet that was shorted.. Due to my carelessness...

A very fine sliver of solder bridged the gate to the drain. Would this
usually destroy the said mosfet? Or something else in line with it??

Its a K3556... Is there a simple test for these? The drain pin was cut
off, but enough left to make a very fine solder bridge... ughh...




Well scratch that.. If I'm holding the volt meter on the gate side of the
mosfet while starting up it will work... i guess I have to trace back and
see whats burnt up..


It's most likely if you didn't over bias the fet and kill it, you may
Click to expand...
have destroyed the driving circuit since it most likely can only handle
a fraction of what is on the drain..
 
"Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote in message
news:M0Tlo.61858$y85.831@newsfe13.iad...
Michael Kennedy wrote:

I have a power mosfet that was shorted.. Due to my carelessness...

A very fine sliver of solder bridged the gate to the drain. Would this
usually destroy the said mosfet? Or something else in line with it??

Its a K3556... Is there a simple test for these? The drain pin was cut
off, but enough left to make a very fine solder bridge... ughh...
yup. That would pretty much forward bias that fet beyond max!
Click to expand...
Actually I got lucky.. It was ok after all.
 
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