(UPDATED) mini chart on NXP range of MOSFETS. for blokes and blokettes interested in using some of them as high current switching alternatives. most of them are dugged out from farnel/element14. enjoy 
And how is this relevant? You posted a chart of high-speed Mosfets, @3roomlab , supposedly suitable for switch-mode PSUs, but 3D printers need low-speed, logic-level, low-voltage and low-RDSon @5V/4.5V mosfets. Which none of the ones on your chart are.
lol there are. you have to look carefully. did you see the ones rated for 100amps? there are the slow ones in the list as well.
(column : ID amperes)
updated with some sample circuit and calculations. feel free to ask more questions. i will try to explain where possible
And make sure you protect the FET with the freewheel diode, not the ā¦ I donāt know what.
yes its can also be called a shottky (1 of the faster variants). there are shottky with different speeds, the higher speeds are somewhat better, but any shottky/freewheel will be good for most DC apps
. i dont suppose anyone is doing PWM heaters, it be ā¦ interesting
@3roomlab you see, MosFets are a bit more complicated than a simple switch with a fixed parasitic resistance. The PSMN7R0-100BS with that 100A rating is Suitable for standard level gate drive (thatās like the third line in the data sheet and basically means 10/12V on the gate), which means that the on resistance is going to be quite a bit higher if you only have 5V to work with. Its datasheet has a really nice graph (numbered 003aad571) which shows that the on-resistance is almost constant down to just below 5V and then soars if the voltage drops any further. Which, in turn, means that, on a 3D printer, the transistor will melt down as soon as you have a minor power glitch. And those happen. A lot. Which is why we only use logic-level mosfets.
By the way, all heaters are controlled by a low-frequency PWM signal. Driving them linearly would be quiteā¦ interesting. Smoke-wise.
I was referring to the schematicā¦ The inductive spike you are going to get from the āLOADā is going to go directly to the FETās drain as you have it right now on your schematic. With the right heater element, switching speed you can end up with 100V spike there (not nice for the FET).
As you have it now, you can build a nice 100V switching PSU increasing the switching frequency, a diode and a cap.
ok i have updated the chart and added a few logic capable MOSFETS. thanks for spotting those errors. NXP doesnt seem to have many heavy duty MOSFETS at low prices, but at least i found 3 ā¦ 75A to 100A capacity. if you guys know any else by any other manufacturer, i be happy to add them inside for general reference
Holy crap! What application do you have in mind for a 100A MOSFET!?!? 
@Matthew_Satterlee , honestly, itās usually much cheaper just to pair up 5 20A mosfets if you need something like that. Butā¦starting a car using solid-state switches, maybe?
The kicker here is that the current rating is for the peak current. If youāre switching near-DC (anything longer than about a couple seconds), youā'l always be limited by how fast your heatsink can get rid of the heat generated by the on-resistance. That 100A type would generate upwards of 100W of heat if youād actually load it with 100A - good luck with cooling that.
@ThantiK yep its so true. there are cheap MOSFETS that can be paralleled to have the same RDS resistance. element14 have MOSFETS that costs over USD20 but can be made using multiple 50cent equivs LOL.
@Thomas_Sanladerer yea i know, spreading the heat is serious business :D. and ironically, most new power electronics designs tend to avoid them due to costs, just deploy on PCB and treat it like a heatsink o.0. i even saw some 270A rated DPAK SMD, i wonder if they are single use MOSFETS