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TPD1E10B06-Q1: Bi-directional ESD diode has polarity marking

Zalan Illes
Prodigy 20 points
Part Number: TPD1E10B06-Q1
Other Parts Discussed in Thread: TPD1E10B06

Tool/software:

Hi,



TPD1E10B06 is a bidirectional ESD diode as per the datasheet,  but it has slightly different characteristics in different directions. For example: clamp voltage concerning pin1 to pin2 and pin2 to pin1. On the IV curve I see asymmetry as well.)   I also noticed there is a polarity marking on the package. So is this part polarized? I have seen a polarized bidirectional ESD diode but in that case, it was mentioned: asymmetrical. 

  • 0
    TI__Expert 8120 points

    Hi Zalan, 

    To be honest, this isn't something I was aware of. Besides clamping voltage and R dynamic, what other differences are you noticing? Rdyn is derived from the clamping voltage, so I understand that this is different. 

    What is the polarity marking you are seeing? We typically only use a 0 or a stripe to denote Pin 1 for our devices. 

    Also, I wouldn't necessarily say this is asymmetrical since the working voltage is the same in both directions. The only difference is the clamping voltage is showing better clamping in one direction. 

    Best,

    McKenzie

  • 0 in reply to McKenzie Eaker
    Prodigy 20 points

    Hi,

    1. I found differences in IV curve as well: cca -7.8V vs 8.2V. 


    2. I see a strip on the package as a polarity marking. But if the device is symmetrical why is a polarity marking on the package?

    3. If there is a difference in clamp voltages, that would not mean part is assymetrical? 

  • 0 in reply to Zalan Illes
    TI__Expert 8120 points

    Hi Zalan, 

    We mark all of our parts whether the device is unidirectional or bidirectional with a Pin 1 indicator. 

    So TPD1E10B06, is one of our older devices (about 13 years old), and it used a different process than what we use today. My guess this is the reasoning for some of the specs being slightly off and not fully symmetrical. If you would like, I can ask our Design engineer for his thoughts on this. 

    Best,

    McKenzie

  • 0 in reply to McKenzie Eaker
    Prodigy 20 points

    Could you please ask and confirm with your Design engineer that this part has no polarization and from where the asymmetry comes? 

    It would not also be better to leave marking this case off because I think this can cause confusion or unnecessary rework for assembly plants. (Legend on PCB will show polarity and also package has polarity marking, and if these two markings are not in the same position, rework will occur.) 

    Best regards, 

    Zalán

  • 0 in reply to Zalan Illes
    TI__Expert 8120 points

    Hi Zalan, 

    I reached out to our Design engineer and the not identical breakdown voltage is due to component/process. Because of this, the clamping voltage at lower currents varies. The clamping voltage at higher currents (5A), the clamping voltage is the same (14V).

    Please let me know if you have additional questions. 

    Best,

    McKenzie

  • 0 in reply to McKenzie Eaker
    Prodigy 20 points

    Does this mean that part is polarized then? Pin1 and Pin2 are not interchangeable? 

  • 0 in reply to Zalan Illes
    TI__Expert 8120 points

    Hi Zalan, 

    The part has the same working voltage in both directions. Due to process, the breakdown voltage differs slightly resulting in slight variations in clamping voltage, but the pins are still interchangeable.