Author Topic: Sleuthing a cooked MOSFET - anyone care to guess?  (Read 358 times)

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Offline rx8pilot

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Sleuthing a cooked MOSFET - anyone care to guess?
« on: September 27, 2019, 06:05:43 pm »
On the non-isolated side of a power supply - this part is cooked beyond recognition. It appears to be a MOSFET with pins 5-6-7-8 tied together and pin 4 (presumably the gate) has an isolation slot cutout.

I don't have the physical PCB in my hands yet, but I would expect this to be a fairly high voltage area. The unique-ish nature of a 7pin SOIC [pin 3 deleted] should narrow it down along with what appears to be a portion of a logo.

Any guesses, hypothesis, etc would be appreciated.

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Offline rx8pilot

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Re: Sleuthing a cooked MOSFET - anyone care to guess?
« Reply #1 on: September 27, 2019, 06:06:26 pm »
Larger view.......
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Online T3sl4co1l

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Re: Sleuthing a cooked MOSFET - anyone care to guess?
« Reply #2 on: September 27, 2019, 06:27:15 pm »
TOPSwitch.  Anyone's guess what amperage.

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Online blueskull

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Re: Sleuthing a cooked MOSFET - anyone care to guess?
« Reply #3 on: September 27, 2019, 06:31:59 pm »
Power Integration's Top Switch series.
 

Offline rx8pilot

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Re: Sleuthing a cooked MOSFET - anyone care to guess?
« Reply #4 on: September 27, 2019, 07:09:48 pm »
Impressive!

Looking like a TOP25xG after chasing down those tips. Not sure yet where to get them, but at least I know what I am looking for.
Thanks @T3sl4co1l and @blueskull



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Offline tautech

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Re: Sleuthing a cooked MOSFET - anyone care to guess?
« Reply #5 on: September 27, 2019, 08:55:42 pm »
On the non-isolated side of a power supply - this part is cooked beyond recognition. It appears to be a MOSFET with pins 5-6-7-8 tied together and pin 4 (presumably the gate) has an isolation slot cutout.

I don't have the physical PCB in my hands yet, but I would expect this to be a fairly high voltage area. The unique-ish nature of a 7pin SOIC [pin 3 deleted] should narrow it down along with what appears to be a portion of a logo.

Any guesses, hypothesis, etc would be appreciated.
Not uncommon for SMPS controllers.
But SOIC ? Isn't it a DIP ?
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Offline rx8pilot

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Re: Sleuthing a cooked MOSFET - anyone care to guess?
« Reply #6 on: September 27, 2019, 10:15:44 pm »
On the non-isolated side of a power supply - this part is cooked beyond recognition. It appears to be a MOSFET with pins 5-6-7-8 tied together and pin 4 (presumably the gate) has an isolation slot cutout.

I don't have the physical PCB in my hands yet, but I would expect this to be a fairly high voltage area. The unique-ish nature of a 7pin SOIC [pin 3 deleted] should narrow it down along with what appears to be a portion of a logo.

Any guesses, hypothesis, etc would be appreciated.
Not uncommon for SMPS controllers.
But SOIC ? Isn't it a DIP ?

I think you are correct - it indeed looks like a DIP package. Expecting to have the physical PCB in my hand on Monday and Mouser has the DIPs and SOIC's in stock so good either way.

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