We built a prototype device that uses 34 of the TS3A5017 IC in the UQFN package. The prototype developed a short between 1S1 (pin 4) and GND (pin 6). We found 3 of theTS3A5017 IC appeared to be burnt on the top of the case above pin 4. They look as if they had an internal short of substantial power. However, the supply to the devices is 3.3VDC with current limited to 25mA. Additionally, the circuit attached to pin 4 is protected by a Semtech SR05 RailClamp. Below is a photo of one of the burnt devices.
I would like to know how this might have happened and how to prevent it.
Thanks, Ted