Validity of Extending Temperature Cycling

G

GCiTech

#1
We have a customer who is requesting that we extend the temperature cycling test by 250 cycles with just a ferrite core a wire design, without plastic, is there any validity in extending this test?
 
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somashekar

Staff member
Super Moderator
#2
We have a customer who is requesting that we extend the temperature cycling test by 250 cycles with just a ferrite core a wire design, without plastic, is there any validity in extending this test?
Hi GCiTech...
How much was the earlier cycles ?
When you say by 250 cycles, how many cycles is the new requirement ?
What is the technical reason that your customer is stating for this increase ?
Did you reason out with your customer also ?
Is this requested for a type test or as a routine test ?
It is really difficult to comment about validity in extending of such a test for anyone without a good ground and understanding of all inputs and application.
Help us with more details ....
 
M

Murphys Law

#3
The only validity I would argue is to gain confidence in the final readpoint and that you weren't just lucky.

You don't say what T/C conditions are to determine how much 250 cycles are wrt to your pass/fail criteria. For example, if you T/C conditions are -65C/150C and duration is 500 cycles (A Q100 Grade 1 semiconductor), then additiona 250Cycles are x1.5 your qual duration.

If it is lesser conditions - say -40/125C 1000 cycles, then it is x1.25 qual qual.

One thing with T/C is that they may be passing but are already fatigued and about to fail. You may only be testing at room temp but if you tri-temp tested, then you may see failures at either hot or cold temp. Doing Extened T/C with just a room temp is one way to guardband against that.

Did your customer request this upfront or are they springing this on you now? If latter and you had prior agreement, then you may have grounds for saying no. Also what is your track record of issues with temp cycling? If you have been seeing problems before, you may want to do additional cycles to assess it's robustness. The other counter argument of doing 250 cycles is time. If you have dwell times on top of the temp cycles, then this can add time.
 
G

GCiTech

#4
Previous cycle: 1,000 cycles. They want to add an additional 250 cycles which would add an additional 15 days. This is in response to my request to eliminate High Temp Storage. This is a simple wound copper coil surrounded by a ferrite core. This would not be affected by 1,000 hours of High Temp Storage so rather than waste time and money, I asked them to remove it.
 
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