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CSD25402Q3A: How is continuous drain current measured

Russell Wetherley1
Expert 4255 points
Part Number: CSD25402Q3A
Other Parts Discussed in Thread: CSD16409Q3,

Hello E2E,

I have a (hopefully) quick question in regards to our FETs.  Specifically our CSD16409Q3 and CSD25402Q3A.  How do we test continuous drain current?  Are the FETs held on for an indefinite time (seconds, minutes, hours, days of uninterrupted operation???) or do we pulse them for 100ms?  I get the 100ms value from this blog on continuous current:

A quick and dirty explanation of our testing procedures would be greatly appreciated!  Thanks and have a great weekend!

Regards,

Russell

  • 0
    TI__Expert 6775 points
    Russell,

    Continuous drain current ratings in all MOSFET datasheets are all simply calculations that appeared in the blog you referenced. Devices are not tested in production, only "high" current test performed on production devices is the resistance test, the current the devices are tested to is in the test conditions.
    We understand that sometimes a current rating of a silicon based equation can exceed the package capabilities and as such on all newer datasheets we also put a package rating. These are DC current ratings and provided you can keep to the conditions have no time limitation. For short periods the package can handle way higher currents, hence why the pulse rating can be higher than a package or silicon rating but operating continuously at pulsed type currents will degrade lifetime.