Hi guys,

Does anyone happen to know what these "98%" curves are on some of the Infineon MOSFET datasheets for Rds(on) and the body diode forward voltage drop? I've checked through their documentation and I actually phoned their support number to no avail (surprisingly!)

Please find an example here: http://www.infineon.com/dgdl/IPW60R...90004&fileId=db3a304412b407950112b42d8e55489b
(on pages 5 and 6)

I'm thinking it has to do with some kind of binning, but I'd like to make sure before using the numbers.

Thanks

 

Hello,

I think you mean the puctures 7 and 10 of the datasheet.

There are mosfets with a higher Rds_on as the typicalvalue.
The 98% curve is the curve on wich 98% of the produced mosfets should match.

Also here with the Vds, there can be samples with a higher Vds than the typical value,
but 98% has the 98% curve as a maximum value.

Bertus

 

With parameters that follow a normal distribution the standard deviation tells you how far from the mean you would find typical values. If the greek letter σ represents the stndard deviation then:

±σ ≈ 68% of the cases
±2σ ≈ 95% of the cases
±3σ ≈ 99.7% of the cases

So I'm guessing that 98% curves cover a range jus a bit looser than ±3σ. With a bit of effort I could tell you the exact range in terms of standard deviations.

 

Thank you for the detailed explanation guys. Very helpful and good to know for the future. I appreciate it.