slapshot136 wrote:lizardmech wrote:These are a good alternative to direct fets, easier to solder at home. Direct fet package has lower thermal resistance on the top but less on the bottom. While the FDMT800 isn't as good on the top but retains low resistance to PCB.
http://mouser.com/ProductDetail/Fairchi ... MT80060DC/
You can buy them directly of the fairchild website for less if you want a batch of them.
Thermal issues aside, are they any better? I see the rdson is 1.1mOhm - was asking more as a direct replacement for the v4.12 hardware than for an entirely new design
Silicon mosfets are pretty mature technology, all you can do is get different packages. The large 60V ones will all be 0.8-1.2 mohm. You will perhaps get slightly less capacitance on the newer packages. You might actually be able to swap the FDMT800 fets onto a vesc 4x board if the gate pin is on the same side, I soldered them to quite a few other SMD mosfet footprints.
All the latest developments are on SiC and GaN mosfets but they're extremely expensive and mostly aimed at 600V rather than low RDSon at low voltage.