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ULN2003A: ULN2003BPW - failing in thermal cycling

Gaurav Valecha2
Prodigy 100 points
Part Number: ULN2003A
Other Parts Discussed in Thread: ULN2003B,

Tool/software:

Hola , 

We had design a product around this IC , the IC functional test found okay, during trial production batch , the IC was found okay. Now my product just entered into production phase & we are facing issue. The said IC gets damage. in production batch of 10 batch 7 pass & 3 fails, the testing & production remains untouched. I am sharing batch code for one failed IC , can you please suggest is it a batch level IC issue. 

marking over IC : UN2003B 26KG4 AX16 . 

the thermal cycle is in range of -30 degree C to  55 Degree C . for time duration 7hr 

It would be great if you could suggest me some way out , my yield of product is affecting. 

Please note all the ULN2003B IC were sourced via digikey.

Warm Regards 

Gaurav 

  • 0
    TI__Genius 16095 points

    Hi Gaurav, 

    We will investigate from our internal team to see if there is any batch issue, however it would be helpful if we could understand from an applications perspective under what test and conditions this device is failing. 

    Could you provide a schematic and details of the test setup? Under what conditions is the ULN2003B thermal cycled? 

    Best Regards, 

    Elizabeth 

  • 0 in reply to Elizabeth Higgins
    Prodigy 100 points

    Good Morning Elizabeth , 

    following image shows the thermal cycle that we follow , in negative temperature the said IC fails  

    Not all IC fails , the success ratio is 70% pass & 30% fails , we have closely looked on the test set up & we do not suspect on test set up as it is working fine for other products . Also I would like to highlight only this IC fails. When replaced with fresh IC & re-run the test the product pass the set & we have deployed ~100s of product , but this is first time we are facing such Issue. 

    Warm Regards 

    Gaurav 

  • 0 in reply to Gaurav Valecha2
    TI__Mastermind 34935 points

    Gaurav,

    Just to confirm- when you sourced them from Digikey, it was directly from Digikey and not a marketplace vendor, correct?

    As the ULN2003B has been obsoleted, our recommendation would be to test with the ULN2003A device and see if this problem persists.

    Best Regards,
    Tim