EEVblog 1387 - MOSFET Repair Replacement Search

Dave tries to find a locally sourced replacement MOSFET for a dumpster repair and battles the RS Components and Element 14 wonky search engines and parametric search engines.

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[TheDefpom]

Usually in my case the part is obsolete and needs some kind of sub that works.

[perhansson]

The PFC MOSFET usually fails because of a failed main filter capacitor in my experience, the PFC coil then dumps all the energy into the MOSFET and it releases the magic smoke. It used to be that the main filter cap had an easy life but now with PFC it basically is in a high frequency switching environment.

[randycarter]

There's a lot of competition in the MOSFET world. If your part number is wacky it makes it harder for potential customers to find the part they need.

[shehryarshaheen]

Sir u have no idea how much this video have helped me.
Thank you very much.

[flymypg]

Love parametric search engines. Wish Amazon had one...

[TomStorey]

RS search has some quirks that you have to get used to.

Also you might see up the top in the "breadcrumbs" that the last item is the search term, but I often find that I need to click back to the previous level otherwise some parts can be excluded from the search results.

[keithking]

this stuff confused the hell out me when i 1st started learning electronics, so im sure this video is a huge help to loads of people.. : )

[TheDefpom]

I wish I could get next day delivery, it takes two weeks to get anything, a week if they have them locally! Sometimes it takes element 14/RS a few days to even process the order ! Arrow and digikey are much faster, same day processing, maybe a week to arrive.

[PhilDavisFilms]

There's an option on RS that's "search by MPN (Manuf. part num?) and when checking that, 18N50 works. Also I saw on the top of the parametric search they had a 'from' and 'to' that you could probably use for ranges. Yet again, another great video showing how to figure out what's a good replacement part. I like this, as it helps me start understanding what are the most important component values to use.... Edit: I see you got there at the end... guess I should have waited haha.

[transmitterguy]

This is the most informative vid that Dave has done, thanks, Dave. I have a terrible time using these searches, always with no or wrong results. If Google doesn't find it, I quit looking.

[ovalteen]

The hard part is finding replacement switches. In addition to the usual ampacity, #throws, #poles, switch style, etc. you gotta get the right pin pitch and row pitch, and it seems that Mouser and DigiKey don't even offer those items in their parametric search.

[Sobakin]

STP18N55M5 relatively new "super junction" technology now are really cheap and runs much cooler due to less Rds and lower switching charges.

[velox__]

This video is just what i needed, thanks Dave! keep up the good work :)

[brutester]

At 17:12 Dave: "We have nothing here" Me: You have a freakin FDA18N50!!!!

[dustyturnwood]

Thanks Dave. I think I found the right replacement mosfet.

[thekaduu]

In one of my past projects, I developed a system (for the company) that checks new and existing customers in the consolidated sanctions list. Right now, you are not on the sanctions list for US. It probably was a mistake if you were ever in the list...

[vincei]

I wish DigiKey was next door to my house. They'll never be able to remove me from the premises :)

[guyh]

I was shouting "asterisk" for the whole time.
Finally you used it ;)

[Sloxx]

Just a note- mosfets with an insulated tab are TO-220F package or isowatt package.

[DannyBokma]

I actually used winsource a couple of times to buy parts that are no longer available on the market. Surprisingly its fast and they deliver the real deal.