3077 or 4110

Hello, I have a question for those that know about this sort of thing. I have, in my possession two controllers. Both are from EM3EV and are 12 fet Infineon controllers. One has 4110 fets, the other has 3077 fets. I do not know the difference between the two. I know that the 4110 is a few dollars more so I assumed that meant it was better quality or had better performance. This is the one that I bought new but I just bought a used kit with a 12 fet 3077 Infineon. Both have the 3xx board.

Here is the dilemma. I have my main bike which is a giant DH Comp with a MAC 7T rear running on 14S/14P. My other bike is a Gary Fisher King fisher 1 with a MAC 6T but this will be running a 10S/10P battery. both run 30 amps battery and 60 amps phase. The Gary fisher is used to ride trails and the DH Comp is for commuting - mostly road riding.

So which bike gets the 4110 and which bike gets the 3077? Or does it really matter one way or the other?

that's an easy one 3077 are to be prefered over 4110 if the voltage is low enough.
3077 have a Vdss of 75v and an internal resistance of 2.8-3.3mOhm.
4110 have a Vdss of 100v and an internal resistance of 3.7-4.5mOhm.
both FETs are used because of their LOW internal resistance. so if your voltage is below 70v (or 63v as this is the voltage limit of the CAPs often used in those "lower voltage" controllers, the 3077 version is to be preferred as the controller will stay cooler at the sam current going through it.
that's it

ps: even though you didn't mention battery chemistry: 14s even with lico is 58.8v hoc, so it's low enough for both of the controllers. and the 10s is even lower. so it won't matter a thing which one you use on which bike as long as current is the same.

It really doesn't matter. the 3077 is rated for 75V while the 4110 is rated fro 100V. Both are 120A. The 3077 RDSon is a little lower but they will perform almost identical. You might get 0.2mph difference with the 3077, so in theory, it's the best up to 75V.

Use the 3077 controller with the 10S bike as they are nominally 48V controllers. 14S on it won't leave much headroom for voltage spikes that can lead to premature failure.

Going on 2nd year running several 3077 controllers on 67V off charger. No regen

My first 10T kit from EM3ev, I ordered up the 4110fet controller. My second more recent kit I decided on the 3077fet controller. Both are rated for 40amps. I'm running the same 48volt A123 AMP20 battery. There is absolutely no difference in speed and/or torque. What Paul says is that the 3077 fets are more efficient, so runs cooler. The only reason for the 4110 fets is to run higher volts, upwards to 72v. But.... Paul will not warranty the MAC's at higher volts because it'll start doing heat damage to the motor. 48v * 40amp =~ 2000 watts, on a motor rated at 1500 watts max. I'd reconsider running at higher, hence sticking with the 3077 fet.

Thanks to everyone that replied. It is much appreciated. I think I understand now. I guess I may as well run the gary fisher 6t on the 3077 and the DH Comp 7Tv with the 4110.

I am using samsung 18650 batteries. I did get a LiFePO4 battery with the kit that I bought from Mudduck but I don't anticipate using it much as it is a fairly low capacity. I will probably do a roundy-round the block test on it to see how far I can go on it but it is large-ish for what I believe is a 6ah battery.

Is there any downside to 12 3077 FETs compared to 9 FETs if you plan to stay under 30 amps besides the difference in cost?

Is 12 FETs more or less efficient at 20-30 amps than 9 FETs?

rsilvers said:

Is there any downside to 12 3077 FETs compared to 9 FETs if you plan to stay under 30 amps besides the difference in cost?

Is 12 FETs more or less efficient at 20-30 amps than 9 FETs?

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Go for the 12FET for more torque.

why should the 12fet have more torque? torque goes linear with current. and if both are set to the same current limits they both will give the very same torque.
a 12fet will run a bit cooler as it has two paralleled FETs per phase on the battery side.

A 12 fet will carry the same current as a 9 fet, only longer without blowing up. Or it will carry more current for the same length of time. It will be rated for more wattage (which is a continuous rating) than a 9fet of the same type.

Lyen can set you up and approves the 3077 mofet at 18s 66.6v nominal 75.6v fully charged. Let him know in advanced and he will install higher voltage caps. I ran a 3077 12 mosfet controller on 18s for over a year before I changed build.