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FET -> MOSFET
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Rocketmagnet
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Background:

I am using a Si7456CDP N-channel FETMOSFET in a switching power supply. The power supply and load are housed in a plastic enclosure. Yesterday, the power supply and load were working perfectly. This morning, when I came to power it on, nothing worked. No power. Eventually, I discovered that the FET'sMOSFET's source and drain had shorted together. Replacing the FETMOSFET fixed the problem.

Question:

What could cause an N-channel FETMOSFET to suddenly fail with a source-drain short?

Background:

I am using a Si7456CDP N-channel FET in a switching power supply. The power supply and load are housed in a plastic enclosure. Yesterday, the power supply and load were working perfectly. This morning, when I came to power it on, nothing worked. No power. Eventually, I discovered that the FET's source and drain had shorted together. Replacing the FET fixed the problem.

Question:

What could cause an N-channel FET to suddenly fail with a source-drain short?

Background:

I am using a Si7456CDP N-channel MOSFET in a switching power supply. The power supply and load are housed in a plastic enclosure. Yesterday, the power supply and load were working perfectly. This morning, when I came to power it on, nothing worked. No power. Eventually, I discovered that the MOSFET's source and drain had shorted together. Replacing the MOSFET fixed the problem.

Question:

What could cause an N-channel MOSFET to suddenly fail with a source-drain short?

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Rocketmagnet
Rocketmagnet
  • 27.6k
  • 17
  • 100
  • 188

What can cause a Drain-Source short in a FET?

Background:

I am using a Si7456CDP N-channel FET in a switching power supply. The power supply and load are housed in a plastic enclosure. Yesterday, the power supply and load were working perfectly. This morning, when I came to power it on, nothing worked. No power. Eventually, I discovered that the FET's source and drain had shorted together. Replacing the FET fixed the problem.

Question:

What could cause an N-channel FET to suddenly fail with a source-drain short?