Author Topic: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x  (Read 136115 times)

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Offline 42Khz

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #625 on: June 01, 2019, 02:42:18 pm »
Recently i bought 10 pcs 2DW232 from aliexpress.
Can anyone suggest me a simple method to test if them are originals or fake?
I have only 2 Multimeter (UT61E + AN850B), 1 Power Suply KA3005D and a Rigol DS2072A.

The easiest way is to crack one open.
If it's a single die inside covered in some gunk it's probably real (I'm not aware of any fakes like that) and if it's two discrete zeners it's a fake.
 

Offline Kleinstein

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #626 on: June 01, 2019, 03:59:02 pm »
Looking inside is probably the easiest way.
A non destructive way would be to build a simple reference circuit and measure the noise. Chances are high the fake ones would be much higher noise. I would not mind "fakes" that are very low noise.
 

Offline stijena1973

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #627 on: September 02, 2019, 12:13:29 pm »
I suspect that the component is fake. BE junction of some si transistors in the opposite direction behaves as 5.6 V zener. Could it be a mislabeled transistor?

Check for hfe, just in case.
 

Offline sorin

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #628 on: September 02, 2019, 01:04:38 pm »
They are not  transistors.
 


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