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LM4050-N-Q1: Automotive vs Industrial: LM4050QAEM3-5.0/NOPB vs LM4040AIM3-5.0/NOPB

Edo Duheric
Prodigy 15 points
Part Number: LM4050-N-Q1
Other Parts Discussed in Thread: LM4050-N

Hi 

I am looking for help with identifying differences between  LM4050QAEM3-5.0/NOPB (Automotive)  vs LM4050AEM3-5.0/NOPB (Industrial).

www.ti.com/lit/ds/symlink/lm4050-n.pdf

We may have to use  LM4050AEM3-5.0/NOPB  due to long lead times/availability  of LM4050QAEM3-5.0/NOPB.

I hope these questions are correct place for this forum. 

  • What are differences in design?

For example:  LM4050QAEM3-5.0/NOPB  uses gold bond wires. LM4050AEM3-5.0/NOPB  used copper bond wires.

I assume primary benefits of using gold wire in this package is more thermal cycling capability and better bonding - anything else?

Are there any other design differences? 

  • FIT:

Online calculator indicate same FIT/MTBF values and same sample size. Maybe it is a coincidence and that TI actually tested 2785 pieces of LM4050QAEM3-5.0/NOPB (125C Automotive)   and 2785 pieces of LM4050AEM3-5.0/NOPB (125C Industrial) and 2785 piece of LM4050AIM3-5.0/NOPB (85C Industrial) in same test. 

Are those FIT values product line values or values for each part number? 

ELFR/DPPM values are not available online. I think those are early hour failure and/or EOL failures. HALT testing indicate 0 failures. Does missing ELFR/DPPM mean no failures observed. 

My guesstimates using you calculator for DPPM at qualification temperature is 325. What is correct DDPM value?

  • Temp rating

Based on "Compare all products in Shunt Voltage Reference" (see link below) both parts are available -40/125C (fixed LM4050-N and LM4050-N-Q1) .

LM4050QAEM3-5.0/NOPB  is Grade 1.

It appears LM4050AEM3-5.0/NOPB is -40/125C Grade 1 part - is that correct?

  • Are these two parts made on the same production line?

  • Do you sort out automotive parts from the same production line?

  • What is difference in EOL testing between these two part?

  • How do you achieve  zero defect of automotive LM4050QAEM3-5.0/NOPB (or lower defect) as compared to standard part  LM4050AEM3-5.0/NOPB? Additional EOL testing, burn-in, sorting, design (Cu vs Au) etc? 

  • Note : LM4050AEM3-5.0/NOPB  is 125C rated while LM4050AIM3-5.0/NOPB is 85C rated. What is the meaning of AEM vs AIM? 

Thank you. 

 

www.ti.com/.../temperature-change-FIT.html

  • 0
    TI__Mastermind 19470 points
    Hi Eddy,

    I am asking my internal team to see what information we have over these questions. I will update you when i have an answer.

    -Marcoo
  • 0
    TI__Expert 3835 points

    Hi Eddy,

    I have sent you a personal message on E2E to take this question offline. I will answer some of the questions here for public knowledge.

    The LM4050QAEM3-5.0/NOPB and LM4050AEM3-5.0/NOPB are both -40C to 125C graded parts. The difference is that the automotive grade is design and tested differently to pass AEC-Q100 to be suitable for harsh automotive environments.

    A - is for the accuracy grade of the device, which is 0.1%. B and C are 0.2% and 0.5% respectively
    I/E - is for "industrial (-40C to 85C)" or "extended(-40C to 125C)" which depicts the recommended operating temperature range.
    M - package indicator for 3L SOT23

    Regards,
    Ethan