×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Burnin specs

Burnin specs

Burnin specs

(OP)
Hi everybody
We've got an electric circuit which is specified to be able to operate in the temperature range -40 to +85 Celsius. My questions are:
-at what temperature (s) should we test the circuit for burnin / artifical aging reasons? Is that +85 Celsius or even above? Or is it necessary to change the temperature over the whole range to have a better chance that some parts will fail?
-what about the duration of the test, how does this depends of the temperature? Are there specs avaible to choose from, or some well known values?

Thank you for your help

RE: Burnin specs

It depends on the conditions that are specified for the projected life.  If your life requirement assumes 100% operation at 85C, then acceleration would need to be at a higher temperature.

Unfortunately, you're limited to a best-case max of 125C and possibly less than that, depending on the parts being used.

The Arrhenius rate equation is usually used to determine the amount of acceleration, but it requires determination of the rate constant, which itself requires a bunch of thermal life tests to figure out.

The caveat is that the acceleration temperature should not aggravate any mechanisms that would not ordinarily appear in the operating life.

You may wish to consult the various MIL-STDs that cover topics such as MIL-STD-883

TTFN

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources