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HOW TO CALCULATE MTBF AND FIT

Nikhil_V

Mar 13, 2023
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Hi ppl..

I am calculating MTBF and FIT for electronic components according to IEC 62380 standard. I'm using a calculator tool from ALD service (https://aldservice.com/Free-MTBF-Calculator-User-Guide.html). I am unable to calculate the MTBF of the electrolyte capacitor (part no. 100ZLJ470MGC18X25) which is from Rubycon. I need to calculate the CSR i.e., current stress ratio. and also peak value of pulses. I have attached the pic for reference. Please help me out.
 

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Harald Kapp

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I need to calculate the CSR i.e., current stress ratio. and also peak value of pulses.
These are parameters that depend on the design. You'll have to ask the designer of the circuit for the values to be entered into the form.
 

Nikhil_V

Mar 13, 2023
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Yes. the designer will give the operating values. but for rated values? those are not specified in data sheet of the manufacturer. ex. rated dc current.
 

Nikhil_V

Mar 13, 2023
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Mar 13, 2023
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Ok, ill leave the CSR part for now. For instance how do we calculate the peak value of pulses?
 

Harald Kapp

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This information needs to come from the designer of the circuit. He knows (or should know).
 
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