All new ten IGBT transistors bad or am I measuring wrong?

[caphair]

Recently purchased 10 RJH30E2 IGBTs from china. I go to measure them and none measure properly in diode mode + on C - on E then touch G with + while leaving - on E I still read OL

In about 4 of them I measure the protection diode from C to E

Are all of them bad or do they need more of a bias voltage that my meter doesn’t provide? It uses a 9v battery

Here’s the datasheet for the IGBT: https://www.scribd.com/mobile/docume...709293/RJH30E2

[paulstef]

Re: All new ten IGBT transistors bad or am I measuring wrong?

I would think you don`t have enough voltage from your test leads. Use a power supply a couple of resistors to test them, drive some current through them.

Why would you want to test new IGBTs though? You won`t find out if they are fake this way (at low voltages/currents)

[caphair]

Re: All new ten IGBT transistors bad or am I measuring wrong?

What about only 4 of them giving a reading of the protection diode but the others no? Does it mean they’re bad?

[CapLeaker]

Re: All new ten IGBT transistors bad or am I measuring wrong?

wouldn't be the first time. A while back I had ordered 10 rare transistors from Ali and they were all fake.

[caphair]

Re: All new ten IGBT transistors bad or am I measuring wrong?

What about only 4 of them giving a reading of the protection diode but the others no? Does it mean they're bad?

What about this?

[petehall347]

Re: All new ten IGBT transistors bad or am I measuring wrong?

just get some genuine ones ..i have had cheap fets from china that lasted about 20 seconds in an inverter then bang . it caused so much more damage the unit wasn't worth repairing afterwards .

[caphair]

Re: All new ten IGBT transistors bad or am I measuring wrong?

just get some genuine ones ..i have had cheap fets from china that lasted about 20 seconds in an inverter then bang . it caused so much more damage the unit wasn't worth repairing afterwards .

Couldn't find any anywhere else

[petehall347]

Re: All new ten IGBT transistors bad or am I measuring wrong?

not cheap ...http://nikkoe.com/catalogsearch/result/?q=RJH30E2

[petehall347]

Re: All new ten IGBT transistors bad or am I measuring wrong?

http://www.ohmsupplies.co.uk/RJH30E2-IGBT-TO220

[caphair]

Re: All new ten IGBT transistors bad or am I measuring wrong?

Thanks for the links.

So the ones I have that I don’t measure the internal diode does that mean they’re bad?

[petehall347]

Re: All new ten IGBT transistors bad or am I measuring wrong?

i would say they are bad .

[diif]

Re: All new ten IGBT transistors bad or am I measuring wrong?

I had to buy two lots of these from Ali, the first were fake and blew again immediately.
The second looked nicer and have lasted.

[caphair]

Re: All new ten IGBT transistors bad or am I measuring wrong?

I had to buy two lots of these from Ali, the first were fake and blew again immediately.
The second looked nicer and have lasted.

Did you try measuring the fake vs the real?