FDS6679 and IRF8113 are the counterparts?

[lostrider]

I need a fet replacement on Towerpro 30A (BMC 30A) ESC,
Got two burned IRF8113 on one way.
ESC is on good condition, only need to replace this fets.
Also its have some FDS6679 on board.
Is this counterparts?
if i cant find IRF8113, can i use FDS 6679?

IRF8113
30V Single N-Channel HEXFET Power MOSFET in a SO-8 package
http://www.ortodoxism.ro/datasheets/irf/irf8113.pdf

FDS 6679
30 Volt P-Channel PowerTrench MOSFET
http://www.ortodoxism.ro/datasheets/fairchild/FDS6679.pdf


Also, i got one blank, nameless fet on board,
it isnt damaged, but i wanna know what is this?

[jeffs555]

No, you can't replace IRF8113 with FDS6679. You can't replace an N-Channel with a P-Channel. Also, are you sure the nameless fet is really an fet? It could be a 3-terminal regulator used as the BEC.

[lostrider]

ok, thanks.
is there a replacement options exist for irf8113?

im not sure about the nameless component,
its only looking like a fet and on the way of motor cable.

and this esc is have a seperate bec board, so it cant be bec?

[village_idiot]

http://www.findchips.com shows the irf8113 in stock in a few places in the USA.

[lostrider]

Digikey has $5 handling charge, $6 processing fee , plus shipping price... for $4 order.
I dont know whats the situation on other firms.
i will try to find in my area first.

[lostrider]

You can't replace an N-Channel with a P-Channel.

if i want to multiply the max. current, what i will need to do?
i think only adding more fets enough, but which?
Whats the relation with this fets?

[village_idiot]

Try Mouser if they have them there is no minimum, though I would buy at least two of them and replace both on the ESC. If there are 4 of them, I would probably replace all four. Still far from the minimum for Digikey, but what can you do. You asked, I answered. What you do is up to you.

[lostrider]

No Im glad with your answer, but its hard way... Its last option for me, but always better than having nothing.
I found some IOR distributors in my country, i will try to ask them.

[lostrider]

Other case: I need similar counterpart if exist...

[lostrider]

can i use any other n channel mosfet?
like as IRF7832 or others?
30V Single N-Channel HEXFET Power MOSFET in a SO-8 package
http://www.ortodoxism.ro/datasheets/irf/irf7832.pdf

IRF7832:
ID @ TA = 25°C Continuous Drain Current, VGS @ 10V 20A
ID @ TA = 70°C Continuous Drain Current, VGS @ 10V 16A
IDM Pulsed Drain Current 160A

looking very powerfull than irf8113?
IRF8113:
ID @ TA = 25°C Continuous Drain Current, VGS @ 10V 17.2A
ID @ TA = 70°C Continuous Drain Current, VGS @ 10V 13.8A
IDM Pulsed Drain Current 135A

[MatC]

> can i use any other n channel mosfet?
No, that would be just too simple wouldn't it? :)
Not sure in your particular case, but main differences are:
- Max power dissipation, current, voltage (obviously)
- Max reverse current (probably relevant for an ESC)
- Turn-on voltage
- Transconductance (S on the datasheet)

The last two look ok for the IRF7832 (almost as good as original).
Gate charge slightly higher, but unlikely to be a problem unless it's switched at really high frequencies. I'd try those, but it's 3am here so don't sue me if it's wrong :)

[lostrider]

Really I need easy-to-find counterpart for this component,

Also one IRF8113's "3 pin joint" pcb trace is burned with fet,
and there is a bridge from this to somewhere inside to pcb, i dont know where it goes?
i need this info for repair...

ESC is running without 4 IRF8113! but weak.
how is this running with this condition?
i can hear esc startup sounds only near of my ear.
thats what i have on the back of pcb:
[FDS6679] [FDS6679] [IRF8113] [REMOVED IRF8113]
[FDS6679] [FDS6679] [IRF8113] [REMOVED IRF8113]
[FDS6679] [FDS6679] [BURNED IRF8113] [REMOVED IRF8113]

This removed components burned on some tests lol.
there is a way to use this esc as under 30a?

currently i can drive a cdrom motor with this esc.
2 cm stator, 27gauge 21 turns, 9 stator pole and 12 magnets, star winding.
(magnets n35, 5x3x1, not enough powered motor.)
with gws 4530 prop, its running ok (i think its have 110 gram thrust with 6-8A)
with 8060 prop, its stuttering. Sometimes running but only with a little throttle.



- Max reverse current (probably relevant for an ESC)
?? reverse currrent?

[MatC]

Reverse current: mosfets have a built-in diode that conducts when Source>Drain (N channel devices). This might be an issue with inductive devices (eg motors), but the 7832 looks fine.

[lostrider]

I've found this for cross-reference to 7832:
FDS7766
http://www.ortodoxism.ro/datasheets/fairchild/FDS7766.pdf
30V N-Channel PowerTrench MOSFET

Features
· 17 A, 30 V
RDS(ON) = 5.5 mW @ VGS = 10 V
RDS(ON) = 6.5 mW @ VGS = 4.5 V
· High performance trench technology for extremely
low RDS(ON)
· High power and current handling capability
· Fast switching

Absolute Maximum Ratings TA=25oC
VDSS Drain-Source Voltage 30 V
VGSS Gate-Source Voltage ±16 V
ID Drain Current – Continuous 17 A– Pulsed 60

whats about this?

[MatC]

As I mentioned above, those aren't the only factors. You also need to check:
- Max reverse current (although this may only affect h-bridge, ie reversing ESCs)
- Turn-on voltage
- Transconductance
Do you mean mOhm for RDS ? If so, and if it is properly turned off at 0volts, it should be ok. Also check the pinout is the same if you're hoping for a drop-in replacement.

[Bruce Abbott]

ESC is running without 4 IRF8113! but weak.
how is this running with this condition?With only 2 IRF8113's working, it's operating as a 2 phase controller! It needs at least 3 to work properly.one IRF8113's "3 pin joint" pcb trace is burned with fet,
and there is a bridge from this to somewhere inside to pcb, i dont know where it goes?It will be wired in parallel with another IRF8113 (only pin 4 - the Gate - may have a resistor in series).

When replacing paralleled FET's it's best to use exactly the same part, otherwise they may not turn on together and share current equally. I recommend that you buy enough FETs to replace the whole lot. This will achieve the desired matching, and also ensure that no bad ones remain.

[lostrider]

D D D D
______
____ _

S S S G

one IRF8113's "3 pin joint" pcb trace is burned with fet,
burned trace is IRF8113 source connections trace,

It will be wired in parallel with another IRF8113 (only pin 4 - the Gate - may have a resistor in series).

only pin 4:Gate must be paralel? or Source pins? which is?

I've checked again, I got another component needs to replace; three pins, connected to pin 4, this pin broken... whats this component? on other fets, sames got three numbers on this, but this is nameless.

I've ordered same esc, it will be here as soon.

[lostrider]

only one is have a name: 6Ct
got 3 pin,
pin 1 is connected to Fet's Gate.
1
----
----
2 3

whats this?

[lostrider]

I found this:

Code Device Manf Base Package Leaded Equivalent/Data
6Ct BC817-40 Phi N SOT23 BC337-40
http://www.angelfire.com/electronic2/rch/smt6.html
is this ok?
http://eshop.engineering.uiowa.edu/NI/pdfs/01/31/DS013162.pdf