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LMS3655-Q1: Reliability calculations

Valentinas Pancerovas

Intellectual 410 points

Part Number: LMS3655-Q1

I am checking MTBF for the LMS3655MQURNLRQ1.

The default output shows 0.1 FIT and 7.01xE9 MTBF, however when i tried calculating for a different temperature, i noticed that if i put 55c, i need to set FIT to around 0,1426 in order to get the same MTBF. Is it because the FIT number has been rounded in the initial default output at 55c? I checked some other components and some of them also have a similar discrepancy.

over 1 year ago

0 Gui He over 1 year ago

TI__Genius 17685 points

Hi Valentinas

I will check with team and reply to you later.

Thanks and best regards.

0 Gui He over 1 year ago in reply to Gui He

TI__Genius 17685 points

Hi Valentinas

This should be caused by resolution of the computation.

BTW, are you trying to use MTBF to do functional safety FIT? MTBF is not good way for functional safety FIT.

Thanks and best regards.

0 Valentinas Pancerovas over 1 year ago in reply to Gui He

Intellectual 410 points

Hello Gui He,

Then i will take 0,1426 as the value.

Can i use this calculator for any suppliers FIT conversion for different temperatures?

I am trying to do technical FIT. Just curious, where can i find functional safety FIT data for each part?

Thanks,

Valentinas

0 Gui He over 1 year ago in reply to Valentinas Pancerovas

TI__Genius 17685 points

Hi Valentina

Not sure if you checked this page:

https://www.ti.com/quality/docs/estimator.tsp?partType=tiPartNumber&partNumber=LMR51420#resultstable

You can input other's devices and find the FIT data.

thanks and best regards.