Testing a Zener-Protected SuperMESH MOSFET With A Multimeter

[stevekasian]

Hi,

I am trying to obtain a rough determination as to whether a component is burned out or not. It is a 10NK70ZFP Zener-Protected SuperMESH MOSFET and can be found here: https://cdn.badcaps-static.com/pdfs/...846f9f6885.pdf

Can anyone give me any advice on what kind of readings I should get if the part is working properly?

Thanks!
Steve

[stevekasian]

Re: Testing a Zener-Protected SuperMESH MOSFET With A Multimeter

I've removed the component from the circuit and checked it on the 20 ohm scale.

G-D and D-G measure about .4 ohms. This is not a good thing I presume?

[stevekasian]

Re: Testing a Zener-Protected SuperMESH MOSFET With A Multimeter

SORRY - MISTAKE:

The measurements above should be S-D and D-S measure about .4 ohms, even after I short the source & gate together to discharge it.

Is this a bad thing?

[PlainBill]

Re: Testing a Zener-Protected SuperMESH MOSFET With A Multimeter

SORRY - MISTAKE:

The measurements above should be S-D and D-S measure about .4 ohms, even after I short the source & gate together to discharge it.

Is this a bad thing?

Good / bad is an ambiguous concept. For example, your doctor tells you your chest pains are due to a 90% blockage of two of the arteries in your heart. They can easily insert stents. You'll be out of the hospital the next day, normal activities in a week. Is this good news or bad news?

Similarly, yes, the MOSFET is bad. On the other hand, you can easily replace it rather than spend hours trying to locate a failed component.

PlainBill

[stevekasian]

Re: Testing a Zener-Protected SuperMESH MOSFET With A Multimeter

Thanks PlainBill. Much appreciated wisdom.

Correct me if I'm wrong, but isn't it a good thing to know whether a high power component, such as a particular MOSFET, is bad in order to help realize what other potential problems may exist with the circuit?

Thanks,
SK

[Agent24]

Re: Testing a Zener-Protected SuperMESH MOSFET With A Multimeter

I think the more you know about it the better, whether or not you actually find out is a different matter...

[meokito]

Re: Testing a Zener-Protected SuperMESH MOSFET With A Multimeter

SORRY - MISTAKE:

The measurements above should be S-D and D-S measure about .4 ohms, even after I short the source & gate together to discharge it.

Is this a bad thing?

Hi, and finally... it was good or bad? I have the same doubt
Regards