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SN65HVD24D这颗485芯片只用于接收数据时芯片发烫

见信好!

   SN65HVD24D这颗485芯片只用于接收数据(不发送数据,波特率是460800),接收脚1脚用于驱动S9013三极管来做电平转换给FPGA传送数据(1脚直接接到S9013的基极),在这种情况下芯片会发烫,而且已经坏掉一片,请问这是什么原因,原理图如下。