[Solved] Help identify this transistor

[spilihps]

Hello!

Currently trying to diagnose a control board for a AC unit.
Found a transistor marked 6060V5 that is short between all it's legs.
However my Google skills ain't good enough to find a datasheet or compatible replacement!

Any idea?

Thanks!

[wraper]

Seem to be IGBT according to various sources, some say MOSFET. You can order exact part from China though.

One source says:

6060V5 - Power IGBT Transistor, 600V, 60A, TO-3P

High speed switching
Low saturation voltage : VCE(sat) = 2.1 V @ IC = 20A
High input impedance
CO-PAK, IGBT with FRD : trr = 42ns (typ.)

[wraper]

Apparently can be replaced with something like this https://www.mouser.com/datasheet/2/149/FGH60N60SFD-962300.pdf

[spilihps]

Thank you!

Yes IGBT seams about right since the legs is marked with ECG?

Would you think https://www.electrokit.com/uploads/productfile/40324/FGH80N60FD.pdf would be OK?

They don't have 60N60 on hand, and this is a little bit of a time sensitive project..
These are the IGBT that I can receive quickly:
https://www.electrokit.com/produkt-kategori/transistorer/igbt/
(Sorry swedish only)

Then of course it is the matter of what may have caused this, and if something else broke or did cause this to fail. Will probe around a bit more on the board..

[wraper]

Would you think https://www.electrokit.com/uploads/productfile/40324/FGH80N60FD.pdf would be OK?

I guess it should be fine. Not that we know exact specs of original anyway.

and if something else broke or did cause this to fail.

There is high chance that whatever drives it's gate was damaged by current flowing from collector into gate..

[spilihps]

Yeah! I'll have to try to check that out in the morning.

A fast glance, it seems that gate is driven from an IC marked 9506 / NT520
If that makes any sense

[spilihps]

So gate is connected to pin 6 on the IC attached.
This one does not give any Google results either..

Edit! It seems to be a Phototransistor.. The symbol name on the board is "PC"

Found a partnumber named PS9506 and it sugests to be for a IGBT gate driver..

Probably would be best to replace it or at least try to test it..

[SpecialK]

So gate is connected to pin 6 on the IC attached.
This one does not give any Google results either..

Edit! It seems to be a Phototransistor.. The symbol name on the board is "PC"

Found a partnumber named PS9506 and it sugests to be for a IGBT gate driver..

Probably would be best to replace it or at least try to test it..

Looks like one of these:

https://www.renesas.com/us/en/doc/YOUSYS/document/003/r08ds0018ej0100_nepoc.pdf

Optocoupler/gate driver.

[spilihps]

Yep, it sure does..

I think that is pretty good.. That should have isolated the rest of the circuit pretty good..

It may even have survived? My local distributor dont have a IGBT specific optocoupler in stock..

[spilihps]

I have digged a bit more in this circuit now.

The gate is connected via a 1K resistor to Vo pin on the optocoupler. That resistor checks out fine.

Is there a good way to do some basic tests on this kind of optocoupler with a DMM in circuit?

The best thing would ofcourse be to replace this with a new one just in case. However that will currently set us back about a week with shipping right now.

[magic]

There is only one thing you can do with a DMM and it should be obvious

Disconnect the LED, apply power, verify that the output is low.
Send a few mA through the LED (see the datasheet for how much), verify that the output is high.

[spilihps]

Hehe, yes, well, there is also a "signal processing circuit" that they specify in the datasheet.
I guess that is in the "block" connecting the two transistor symbols on the top view diagram.

Ill guess i pull it and hook it up outside of the circuit then

[magic]

If you are lucky, the circuit will do half of the job for you and attempt to drive it permanently low or high.

The other half could perhaps be realized by shorting something or connecting a temporary resistor to VCC/VEE somewhere.

[spilihps]

Pulled it and tested it outside, works great! So i guess the optocoupler is ok.

Now, i did not test it with a real world load though. Could that make a difference?

[magic]

Dunno, you could add a pullup resistor to the output and see if it can drive it down. Be mindful of power dissipation, because gate drivers normally charge/discharge capacitances and don't drive continuous loads. Also dissipation in the resistor will be nontrivial for any significant test current. Perhaps you shouldn't go too far with that testing.

[spilihps]

Yeah, i feel a little more confident that its OK now atleast. So i will re-mount it and hope for the best.
Will report back!

[spilihps]

Update! The transistor arrived, the card is back in the unit and everything works again!

Special thanks to wraper for the invaluable information about the transistor. Still don't know we're you got hold of it!

Also magic thank for some brainstorming regarding the gate driver. It had magically survived though.