The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Mar 28th, 2024, 3:38am
Pages: 1
Send Topic Print
Why IC temperature is limited to 150 degree? (Read 4365 times)
angel
Junior Member
**
Offline



Posts: 13

Why IC temperature is limited to 150 degree?
Mar 26th, 2014, 12:09am
 
Hello every one. I would like to ask one question. When we design IC chip, or read the datasheet, we can often see the IC operating temperature is limited to 150 degree. I would like to know the reason for it. Could you please give some evidence for it? g.g., paper, article, book...
Back to top
 
 
View Profile   IP Logged
Johan Dijkhuis
New Member
*
Offline



Posts: 3

Re: Why IC temperature is limited to 150 degree?
Reply #1 - Apr 10th, 2014, 9:24am
 
When going above this temperature numerous reliability problems pop up, some of which are:
-purple plague at aluminium bondpads with gold wires (see http://en.wikipedia.org/wiki/Purple_plague)
-electro-migration in aluminium gets very problematic (http://en.wikipedia.org/wiki/Electromigration)
-NBTI and PBTI can get very high (http://en.wikipedia.org/wiki/Negative_bias_temperature_instability)

Some none-reliability problems:
-leakage can get very high
-transistor models might be less reliable (they are not tested)

Usually the design manual specifies reliability at different temperatures, and usually 150 C is a lot worse than 125 (if it is specified at all, a lot of processes are supposed to stay at 125 C maximum).
The 150 degrees limit will be based on history, it is not a hard limit but common process qualification stops at 150, so above that you'll have to re-qualify the whole thing. It might also be very hard to get it pass unless it is only at 150 C for a short time, and you might get unknown reliability problems.
Back to top
 
 
View Profile   IP Logged
Johan Dijkhuis
New Member
*
Offline



Posts: 3

Re: Why IC temperature is limited to 150 degree?
Reply #2 - Apr 10th, 2014, 2:03pm
 
Just found some useful links in this thread: http://www.designers-guide.org/Forum/YaBB.pl?num=1394735572. NASA has really extreme requirements, but some mission lifetimes are hours, not years.
Back to top
 
 
View Profile   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2024 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.