EEVblog Electronics Community Forum

EEVblog => EEVblog Specific => Topic started by: EEVblog on April 20, 2021, 02:14:39 pm

Title: EEVblog 1387 - MOSFET Repair Replacement Search
Post by: EEVblog on April 20, 2021, 02:14:39 pm
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.

https://www.youtube.com/watch?v=BnKDj4ed40Y (https://www.youtube.com/watch?v=BnKDj4ed40Y)
Title: Re: EEVblog 1387 - MOSFET Repair Replacement Search
Post by: BrianHG on April 20, 2021, 06:25:39 pm
Hi Dave, where's the link to you being on the US Government's watch-list?
Title: Re: EEVblog 1387 - MOSFET Repair Replacement Search
Post by: T.D. on April 20, 2021, 07:44:45 pm
@Dave: You need to put your search terms into asterisks and the search on the rs site will find you what you need: *18N50*

Title: Re: EEVblog 1387 - MOSFET Repair Replacement Search
Post by: Robert Smith Eco Warrior on April 20, 2021, 10:50:52 pm
Hi Dave,
As an electronics novice I find I end up using the RS parametric search a lot for things as I don't really know what I want until I narrow down what I want by ticking off parameters one at a time.
I find the Farnell site, here in the UK, to be completely novice unfriendly so I haven't bought anything from them.
I have just got some IRF138 chips from Mouser as I couldn't find or know of an alternative solution. That is the first time I have used mouser, but the service seems excellent.
 :-+
Title: Re: EEVblog 1387 - MOSFET Repair Replacement Search
Post by: EEVblog on April 21, 2021, 02:43:22 am
@Dave: You need to put your search terms into asterisks and the search on the rs site will find you what you need: *18N50*

Yes, you didn't watch the whole video  ;D
Title: Re: EEVblog 1387 - MOSFET Repair Replacement Search
Post by: EEVblog on April 21, 2021, 03:13:52 am
Hi Dave, where's the link to you being on the US Government's watch-list?

https://www.eevblog.com/2014/02/24/element-14-holding-orders-based-on-us-government-watch-list/ (https://www.eevblog.com/2014/02/24/element-14-holding-orders-based-on-us-government-watch-list/)
Title: Re: EEVblog 1387 - MOSFET Repair Replacement Search
Post by: Robert Smith Eco Warrior on April 21, 2021, 07:40:14 am
Probably best not order 555 timers, battery holders and 5 tonnes of farm fertiliser on the same day  :-+
Title: Re: EEVblog 1387 - MOSFET Repair Replacement Search
Post by: mindcrime on April 21, 2021, 05:56:59 pm
Probably best not order 555 timers, battery holders and 5 tonnes of farm fertiliser on the same day  :-+

Not quite on the same scale, but this reminds me of an experience I had once. I went into a Lowes home improvement store, to pick up supplies for a couple of different projects. In the end my cart wound up holding a shovel, a sledgehammer, a Sawzall, and about 8 rolls of duct tape. So I get in line, and am waiting to checkout when the guy in line in front of me happens to glance back... after a few seconds he turns back around and goes "I don't know what the hell you're doing, but I wish I hadn't looked because now I'm afraid I'll be charged as an accessory" (paraphrased slightly from memory, this was a long time ago).

It took me a second or two to even understand what he was talking about, because in my mind, each of the things I was buying was for a different, specific purpose. But yeah, when you put it all together, in hindsight, that did look a touch suspicious...  ;D

Title: Re: EEVblog 1387 - MOSFET Repair Replacement Search
Post by: thm_w on April 21, 2021, 08:03:48 pm
It looks like Newark does the same thing, and they don't even have the stupid "MPN" checkbox  :palm::

https://canada.newark.com/search?st=18n50
https://canada.newark.com/search?st=*18n50 (https://canada.newark.com/search?st=*18n50)

As usual, digikey gets the simple things right.
Title: Re: EEVblog 1387 - MOSFET Repair Replacement Search
Post by: cortex_m0 on April 22, 2021, 12:56:08 am
Newark, Farnell, and element14 are essentially local logos (Newark = US/Can, Farnell = UK/EU, element14 = Aus/NZ/India/Hong Kong) on the same website, so that's fully expected.
Title: Re: EEVblog 1387 - MOSFET Repair Replacement Search
Post by: fivesixzero on April 23, 2021, 02:21:21 am
Good timing on this video, Dave! I was just looking at replacing some MOSFETS for the first time while reparing an old consumer APC battery backup unit.

There really aren't many resources out there for 'intermediate' learners like me that are looking for what's important in replacing a MOSFET. I'm still getting my head around how inverters and SMPS supplies work in detail so I want to make sure that any replacements I got for the SMPS portion (driven by an IRF740B) or the inverter(s) (driven by 8x SP80NF55) wouldn't muck things up too much.

Your explanations here helped me grok things a lot more clearly. Thanks, dude. :)