SOT-23 Mosfet 2N7002

[ITFan]

Hello dear members.

Are these mosfets from the 2N7002 series, such as the 2N7002LT1G and the 2N7002ET1G, interchangeable despite their different values?
Even within one model there are differences if you look at several manufacturers, as described in this thread with picture.

https://www.badcaps.net/forum/troubl...rdview-ms-7e06

This causes a lot of confusion if you want to swap them.
Here is a comparison of the technical data: https://de.findic.com/vergleich/2n70...b8Lm6oNO3.html

The chip itself has a 702 on it, which according to the SMD codelist should be a 2N7002LT1G from Onsemi. But MSI wrote to me that it should have a 2N7002ET1G on it, but its code would be a 703. Totally confusing somehow.

The chip itself has a crack in the black housing, maybe it doesn't matter? Unfortunately, it was mechanically damaged when I removed the socket of the USB3 front header panel. Had to swap pins as 3 were broken. Is it possible to measure whether it is still ok and possibly leave it?

Best regards
ITFan

[piernov]

In most cases these MOSFETs are used with pretty low voltage, do not carry any significant current, and do not switch at high frequency. So the exact specifications do not matter.
A lot of motherboards will have at least one somewhere so if you have any donor boards just get one from there. Even if it's not specifically a 2N7002 but it's N-channel, has the same package and pinout it would often be ok.
To be sure we need to know what circuit it is used in though.

[ITFan]

Enclosed is the circuit diagram section of the predecessor (Pro Z690-p; MS-7D25)
which is almost pin-exact like the Pro Z790-p wifi.
With red marking for the chip in question.
I have not yet been able to find the circuit diagram of the MSI Pro Z790-p; MS-7E06,
but the position of the chips and other things are almost identical.
Maybe that will help.

[ITFan]

Hello again.

This is the culprit we're talking about.
Could it even be that it works despite the crack and i could leave it in or would it be better to replace it?
If replacing, would it be better a 702 (2n7002LTG1) or a 703 (2n7002ETG1), both onsemi?
As an "almost layman", how would you go about measuring whether it is still OK despite the crack caused by mechanical pressure?
Could the crack in the outer housing possibly not be relevant, as the contacts underneath are still ok?
Or does this affect the electronic values? Can this be measured relatively easily, as already asked?

Best regards
ITFan

[ITFan]

Hello dear forum members,

here are the differences that might be important in some places in the 2 pictures marked for better understanding.
Which of the two would you choose?
The 2N7002LT1G, SMDCode:702, which is apparently inside, or the supposedly slightly better 2N7002ET1G recommended by MSI?
You can see from the values (marked) that there really are quite a few differences.
That's the reason for my uncertainty in this case and because I'm not so familiar with it.
Please excuse my uncertainty and the fact that I am asking so precisely.
Thank you very much for your help.

Best regards and have a nice Sunday.
ITFan

PS: can the existing LT1G, which is slightly cracked, be checked/measured?
Perhaps it is not necessary to replace it?

[mon2]

https://youtu.be/wO1fqLuP8RA?feature=shared

[ITFan]

Thanks for the video link.
The cracked mosfet as seen in the picture seems to be OK in terms of measurements.
You can easily tilt up the black housing and see the MetalContacts underneath.
Does the connection to the inner metal contribute to the function and electrical values?
Should I decide to change, which of the two suggested (comparisons with markings are in the last post) would you take for the MSI pro Z790-p wifi?)

Many thanks for your help.
Regards
ITFan

Translated with DeepL.com (free version)

[mon2]

If replacing, I would select the one on the right which offers a higher current support @ 310mA.

[ITFan]

Hi again

do the large value differences in the ohm range play a role and the strongly deviating switching times in ms?
The values can be seen exactly in comparison in the pictures.
Many thanks for your help.

Regards
ITFan

PS: nice forum where you can also learn something, really great, thank you!!!

[mon2]

Do not be concerned about the many parameters of this part. It is a jellybean mosfet used for general purposes and is low cost. We use the same often in our many product designs. Likewise, the small variances will not prevent the target device from working if you decide to replace this component.

[ITFan]

Ok. Thank you very much for your kind help!