Failed IC - Any VLSI or IC Fab experts??

Discussion in 'General Electronics Chat' started by jrz126, Dec 14, 2015.

  1. jrz126

    Thread Starter New Member

    Sep 17, 2008
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    I've been having some issues with 14013 Dual D-flipflop failing. Unfortunately this is work related so i cant give very many details.
    The devices have been analyzed under a microscope. but the supplier is only saying arcing and overheating.

    I took a VLSI class in college, but that was a very long time ago. Looks like it is a positive output transistor that failed?

    Here's the datasheet:
    http://www.onsemi.com/pub_link/Collateral/MC14013B-D.PDF

    Hoping someone with more insight into IC die failures can comment if theyve seen this before? and if it is an internal IC defect or something external caused it.
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
    3,250
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    Looks like ESD damage to me.
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,050
    3,244
    Yup, looks like ESD or other type of overvoltage at the output pin.
    What is pin 13 connected to?
     
  4. jrz126

    Thread Starter New Member

    Sep 17, 2008
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    0
    That output pin drives the base of an NPN transistor through a 9k resistor.
    It also goes to a test header used for during manufacturing test. The pin is right next to the -15V supply test pin. The IC runs on +15V and Gnd, would the same damage occur if the output pin was shorted to -15V supply?
     
  5. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Quite possibly, especially if there is no current limiting resistor between the IC pin and the test header.
     
  6. alfacliff

    Well-Known Member

    Dec 13, 2013
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    the bottom layer of the dyw acts like an insulator between the chip carrier and the dye., if reverse connected, it causes damage by conducting.
     
  7. eetech00

    Active Member

    Jun 8, 2013
    650
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    Looks like damage caused by something other than ESD to me...
     
  8. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Too much damage for ESD. It took real current to melt the metal layer.
     
  9. crutschow

    Expert

    Mar 14, 2008
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    I suggest you add a 20kΩ resistor, either to the 14013 output or the -15V test output to reduce the fault current to a safe level if the two pins are accidentally shorted together.
     
  10. tindel

    Active Member

    Sep 16, 2012
    568
    193
    You tell me... What is the current if this happens? Does that current exceed the worst case maximum current of the device specification?

    Hint - most ic output stages are protected in the following manner... either on purpose or parasitically (usually parasitically) - your device doesn't specify specifically, but if you have a few spares you can check for this sort of relationship with most quality DMMs.
    upload_2015-12-16_4-4-28.png

    The datasheet also says this:
    upload_2015-12-16_4-11-7.png
     
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