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XTR105 internal current source defect

Van-Ngoc Nong
Prodigy 140 points
Other Parts Discussed in Thread: XTR105

Hello,

we have used XTR105 in our products for so many years (about 15 years) without problem .

But since last year we have got many defect XTR105. My Investigation shows that, both of

internal current sources 800uA are defect. I usually get about 15-20mA on current source 2

and 1-2mA on current source 1. Our protect circuit can survive to 4000V against Burst and

to 2000V against Surge. All Burst and Surge are tested with supply line and output line.

My question is, whether TI has changed the XTR105 last time? Or do you have any Idea about?

Best Regards

Ngoc 

  • 0
    TI__Genius 12325 points
    Hello Ngoc
    Do the defective devices show this behavior before the burst and surge testing or is this only seen after the device is tested? The output currents of the current sources that you state would not meet the datasheet specifications for accuracy of the current sources. Therefore it is unlikely that those devices would make it through the final test process and be shipped. Please consult with the registered TI distributor which provided you these parts on how to start the failure analysis process on them.
  • 0 in reply to John Caldwell
    Prodigy 140 points
    Hello John,
    i think you missunderstood. Maybe my desciption made you missunderstand. Sorry about that.
    All Chips were fine after our production. And we shipped to our customer. Those defect Chips were after in used.
    We passed all test of EMC with the limit i said before. Because our design have not changed and all products ran
    without problem until last year. That's why i want to ask whether TI have changed the design, before we think
    about our new design.

    Best Regards
    Ngoc
  • 0 in reply to Van-Ngoc Nong
    TI__Genius 12325 points
    Ngoc,
    TI has not made any changes to the XTR105 design. As I suggested above, please consult with your distributor on initiating a failure analysis for these parts. It is possible that they were somehow damaged in the application.