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TCAN1043A-Q1: ESD level

Part Number: TCAN1043A-Q1
Other Parts Discussed in Thread: STRIKE

Tool/software:

Hi expert, 

Customer is using TCAN1043ADMTRQ1, when doing contact +/-4kV ESD test, there will be Error frame. Do we have any suggestion? 

BTW,  the ESD level in datasheet is HBM +/-16kV, CDM +/-1500V, what will happen if the ESD level over these level, IC broken or just appear error frame?

Thanks a lot! 

Andy

  • Hi Andy,

    Could you provide more information about the 4kV ESD test? Was it simulating the HBM, CDM, or the ISO 10605 standards? Which pins were tested and the error frame was a result? Was the external diode used when testing as shown in the schematic (SZNUP2105LT1G)?

    In general an error frame may result from ESD strikes, but the device will still be fully operational after the ESD strike as passed. This assumes the ESD event was within the datasheet specifications. If the ESD levels exceed the datasheet spec, then the device could either be permanently damaged or have an error frame with slight device damage. This all depends on the length and overall power dissipation of the ESD strike.  

    Looking at the Zener diode you have in your schematic, SZNUP2105LT1G, I noticed it has a high clamping voltage of 44V. The TI ESD2CAN24-Q1 has improved clamping performance around 36-38V. This might reduce the chance the TCAN1043A will have an error frame during an ESD strike. 

    Another possible solution is to move the ESD protection diodes in between the TCAN1043A and the common mode choke L3. Common mode chokes may increase the transient voltage that the transceiver receives. This document highlights how CMCs do this, and some potential workarounds: https://www.ti.com/lit/an/slla271/slla271.pdf

    Specifically Section 2 of the document shows how to move the ESD protection diodes.

     

    Let me know if this helps or if you have any additional questions,

    Regards,

    Ethan