We are using the SN65HVD230DR as a CAN bus transceiver on a BLDC motor controller. We are facing multiple controller units with the SN65HVD230DR out of order. Most of them are externally fine but do not work anymore. One presents a hole near the CANH pin (number 7) :
Could you say if this could happen because of some overcurrent OR overvoltage event (ESD) ?
Here the schematics :
No terminal resistor on the PCB (but on the cable), only an ESD diode (24V) that is not extremely well rated (absolute voltage on CANH/L are about 25V according to datasheet). Besides the ESD diode is not very well placed (not directly near the connector and not on the path between the connector and the transceiver):
What are the main causes of such ic failure ? I know that the protection design is not perfect but are those chips that sensitive to ESD from human body ?
Do you have any suggestion on how to better protect the SN65HVD230DR ?