# 98% curves on Infineon datasheets

Discussion in 'Electronics Resources' started by Obanion, Jan 29, 2011.

1. ### Obanion Thread Starter New Member

Nov 26, 2009
24
0
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

Apr 5, 2008
15,806
2,389
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

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3. ### Papabravo Expert

Feb 24, 2006
10,340
1,850
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.

Last edited: Jan 29, 2011
4. ### Obanion Thread Starter New Member

Nov 26, 2009
24
0
Thank you for the detailed explanation guys. Very helpful and good to know for the future. I appreciate it.