• State Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 3 answers
  • Subscribers 64 subscribers
  • Views 615 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM5161-Q1: High junction temperatures

tateo yamashiro
Guru 10890 points
Part Number: LM5161-Q1
Other Parts Discussed in Thread: LM53635-Q1, LM5018, LM25141-Q1, LM53603-Q1

Hi,

We got a question from the customer about LM5161-Q1.
Could you help us?

[Question]
According to the datasheet, the operating lifetime is de-rated for junction temperatures greater than 125C. How should we estimate the derating of operating lifetime at over 125C?

Best Regards,
tateo

  • 0
    TI__Mastermind 25590 points
    Yamashiro-san,

    The general rule of thumb is that a 10C increase in temperature will reduce the lifetime of the IC by half. This, of course, is a rough estimate which is only applicable to certain failure modes, but this is what people say.

    In reality, we cannot guarantee any numbers outside the rated operating conditions of the IC. So the best I can say is that people generally say every +10C will reduce the lifetime by half.

    -Sam
  • 0 in reply to Samuel Jaffe
    Guru 10890 points

    Hi, Thank you for your reply. How much is the life time at less than 125C junction temperatures?

    Best Regards,
    tateo

  • 0 in reply to Samuel Jaffe
    Guru 10890 points

    Hi, Sorry to bother you again. I would like to ask you more clearly. They want to know the lifetime at less than 125C and 150C. I found the lifetime is defined in LM53635-Q1 datasheet. Could you give us the same data for LM5161-Q1?

    If you need more detail of their requirement, I could send a information by e-mail. Could you tell me your e-mail address?

    Best Regards,
    tateo

  • 0 in reply to tateo yamashiro
    TI__Mastermind 25590 points
    Yamashiro-san,

    The lifetime of an IC is heavily dependent on the application, end equipment... Different temperatures over time (and other conditions) can affect lifetime. That said, a rough estimate would be 12,000 hours at 87C for a general case.

    -Sam
  • 0 in reply to Samuel Jaffe
    Guru 10890 points

    Hi, Thank you for your support. They would like to know one more thing.

    The sentence which "High junction temperatures degrade operating lifetimes. Operating lifetime is de-rated for junction temperatures greater than 125°C." exists on the datasheet of some parts such like LM53603-Q1, LM25141-Q1, LM5018, and more. Is there any rule to add this sentence?

    If you need more detail of their requirement, I could send a information by e-mail. Could you tell me your e-mail address?

    Best Regards,
    tateo

  • 0 in reply to tateo yamashiro
    TI__Mastermind 25590 points

    Tateo-san,

    IC lifetime is heavily application dependent, among other things. The general rule is half the lifetime per +10C but even that's a rough estimate.

    I doubt I can provide more information but if you'd like to email me, you can reach me at samj@ti.com

    -Sam

  • 0 in reply to Samuel Jaffe
    TI__Mastermind 25590 points
    Tateo-san,

    The reason this is in some datasheet and not others is simply because some engineers have decided to include it in the datasheet. Pretty much every IC will experience de-rated lifetime at elevated temperature. I have not heard of any that will not. The fact that some say it and some don't does not mean some ICs are more susceptible to this.

    -Sam