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TPS78001DDCR - problem with parameters

Tomasz Sztuka
Prodigy 25 points
Other Parts Discussed in Thread: TPS780

Hi, 

I have a problem with parameters of TPS78001DDCR.

Ignd should be about 1 uA, but I have in some examples 70 uA (with vertical line).

This problem is only in exaples with vertical line on casing.

Is it a fake ?

What does it means CEA on case ?

In two examples on foto there are different horizontal lines over or under letters (CEA). What does it means ?

  • 0
    TI__Guru 55940 points
    Hi Tomasz,

    I agree that 70 uA is well outside of the expected ground pin current for TPS780. What are the conditions (Vin, Vout, Iout) at the time that you measure 70 uA? Also, just to be sure, since the most common cause of increased ground current is an unintentional leakage path such as excess flux left on the board after assembly, when you do a visual inspection you do not see flux? I do not see any in your picture above, but just want to make sure especially due to the via by pin 4 and not being able to see the components on the other side of the board.

    CEA is the topside marking for the TPS78001. Due to the small size of some packages, we are not able to put the entire part name on the package. Instead a code is used. You can lookup the topside marking of TI devices here: www.ti.com/.../partlookup.tsp

    In order to mitigate the risk of counterfeit devices, we strongly recommend purchasing devices either directly from TI or one of our autohorized distributors as you can find here: www.ti.com/.../anti-counterfeit.html

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    Prodigy 25 points

    Hi,

    We used an external system to measure TPS78001DDCR, as in the documentation on page 17, where R1 = 510k, R2 = 820K, Vin = 3.6V, Vout = 1.9V. In this measurement system, the defective stabilizer had Iout = 70uA, good about 2uA.

    How can you identify defective elements after the markings or labels?

    We buy about 20,000 stabilizers per year, so this is a problem for us.

    Below mark on good and bad packaging TPS78001DDCR:

    Fake marked like this:

    and mark good one:

    Regards

    Tomasz,

  • 0 in reply to Tomasz Sztuka
    TI__Guru 55940 points

    Hi Tomasz,

    I apologize for the delay in my response due to the US Holidays.  To pursue this issue further we will need to exchange information that can be considered proprietary; therefore, I am going to send you a friend request/private message.

    The following link will help you learn how to send private messages:

    08) Adding Friends & Sending Private Messages

    TI E2E Community
    Adding Friends on E2E and sending them private messages is easy to do. Follow these quick steps to perform either. Please note Friend requests are dependent on the party you are sending it to accept. The information on this page outlines: How to add...
    As this should be the last exchange on the public forum, I am going to consider this forum thread resolved.

    Very Respectfully,

    Ryan