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Milwaukee Circular Saw MOSFET Failure

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KDoug

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Hi,

I've recently bought a non working Milwaukee 18V cordless circular saw. I took a chance when I bought it knowing there was a possibility I wouldn't be able to repair it, but I like a challenge so I bought it anyways.

I took the saw apart and found two components on the board that have failed, which I later found out are MOSFETs. I guess my biggest question is- what would cause this to fail? And if I replace it, will it fail again? Also, are there any other parts I need to replace along with them?

I did a quick google search with the writing on the MOSFET, which reads "F1404ZS". I've found two similar parts and need to know which ones will be the best option for me. There are two differences I see between them: Current-Continuous Drain and VGs (Max). Below is a link two the parts I have found:

https://www.digikey.com/products/en/discrete-semiconductor-products/transistors-fets-mosfets-single/278?k=F1404ZS&k=&pkeyword=F1404ZS&sv=0&pv7=2&pv1989=0&sf=0&quantity=&ColumnSort=0&page=1&pageSize=25

The two parts I have listed are made by Infineon, are there other brands I should be looking at? I didn't know how to filter down my options, because there are a lot of numbers and information on these MOSFETs and I really don't know what most of it means.

I have also attached some photos of the broken part. The writing reads F1404ZS, International Rectifier Logo, 016P, TC, 3W



Thanks, any help will be appreciated.
 

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KDoug

Member
Sorry, didn't update this thread because nobody replied. I bought a replacement MOSFET and got the saw running again.
 
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