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herman
2007.10.01, 10:24 PM
so what's new out there in fet land?

just found out some info on this site (fet specs)
http://www.rcc51.com/FET%20SP8M4.html

SI4562DY is there... and so is this SP8M4... anybody try it out yet?

what's the best fet anybody tried out thus far?

kja812
2007.10.01, 11:06 PM
SI4562DY is there... and so is this SP8M4... anybody try it out yet? what's the best fet anybody tried out thus far?

SP8M4 is made by Rohm. I just got in 6 samples in this week. I'm actually looking at them for a non-mini-z application - small perk being an electrical engineer is good access to production samples.

I haven't tried them out yet (in a mini-z that is). They have the lowest on-resistance I have seen to date in a 8 pin SOIC package. The N-channel timing specs are close to HAT3010R but a bit slower rise/fall times on P-channel. They are available from Digikey and other distributors at around $2.00US.

Here is a link to datasheet:
http://www.rohm.com/products/databook/tr/pdf/sp8m4.pdf

herman
2007.10.02, 01:46 AM
thanks for the info... any chance of testing them out on a mini z? :D
where do you plan on testing them on originally? any chance of getting more samples for... more (mini-z) testing??? hehehe...

dohc
2007.10.02, 09:12 AM
7389 > all ;]

kja812
2007.10.02, 10:06 AM
7389 > all ;]

I agree - IRF7389's are very fast parts which helps keeps them cool. And keeping them cool keeps the on-resistance down.

There is just as much and sometimes more heat generated by the switching action of the FET than the actual drain (in this case motor) current, take a look at the thermal response curves in any datasheet if you don't beleive me :) .

I have to hook the mini-z up to scope sometime to figure out what frequency the motor control runs at.