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Forum Index : Electronics : this is sex on wheels (17 inch wheels, for my 848 Ducati.. but anyway)

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poida

Guru

Joined: 02/02/2017
Location: Australia
Posts: 1437
Posted: 09:45am 09 Aug 2025
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https://www.youtube.com/watch?v=XrrHagKlat0
0.42 milliOhm MOSFETs
this is high test drugs for us.
no heat
no loss
easy layout with tiny gate drive loops and tiny inductance.
wronger than a phone book full of wrong phone numbers
 
analog8484
Senior Member

Joined: 11/11/2021
Location: United States
Posts: 155
Posted: 02:29am 11 Aug 2025
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Saw those before and they definitely have nice specs.  However, they do seem more difficult to solder/unsolder and heat sink effectively/easily at least for DIY projects.  It would be cool to see someone try it.
 
davros
Newbie

Joined: 24/02/2025
Location: Canada
Posts: 17
Posted: 09:51pm 14 Aug 2025
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Whats the actual part #, do they have a published footprint?
 
analog8484
Senior Member

Joined: 11/11/2021
Location: United States
Posts: 155
Posted: 04:21pm 15 Aug 2025
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They are SMD parts with bottom side cooling interface.  The lowest Rds_on parts are only available with lower Vdss.  A few examples:

https://www.digikey.com/en/products/detail/onsemi/NVMTS0D4N04CLTXG/9829138
https://www.digikey.com/en/products/detail/toshiba-semiconductor-and-storage/XPQR3004PB-LXHQ/17938427
https://www.digikey.com/en/products/detail/onsemi/NTBLS0D8N08XTXG/22031985
 
poida

Guru

Joined: 02/02/2017
Location: Australia
Posts: 1437
Posted: 10:40am 16 Aug 2025
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I imagined, in a drug fueled feverish dream, small 50mm x 50mm modules that do 80V at 200 Amps and need trivial heat sinks. need 4 of them for an inverter.
tight as a fish's arse gate drive on 2 sided boards.
practically zero high side (floating) capacitance due to tiny size loops.
AND 0.42 milli Ohm Rds(on) per device.
it was a good dream.
wronger than a phone book full of wrong phone numbers
 
analog8484
Senior Member

Joined: 11/11/2021
Location: United States
Posts: 155
Posted: 04:25pm 17 Aug 2025
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Funny ... I have had a similar dream    Your dream system is doable now IF there is proper thermal management ... commercial systems use cold plates which works but rather expensive, large and not off the shelf for one off builds.  Newer SMD packaging with top side cooling (e.g. TOLT) is now available but such MOSFET's are still have Rds_on just above a milliohm.  So, I am hoping they will have sub-milliohm parts within the next couple years.  Also, I am dreaming for off the shelf high wattage cooling solutions like CPU coolers but in more suitable form factors.
Edited 2025-08-18 02:27 by analog8484
 
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