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SN65HVD1785: RS-485 Robust bus

Part Number: SN65HVD1785


I m trying to design a robust circuit using SN65HVD1785

circuit power supply 12-48 V DC

during a test using 40V DC power supply, I deliberately mis-wired BUS A (PIN6) to V+ (40V ) , but the IC failed ,

I did the the same test several times with new ICs but result was the same, IC fails

I need my circuit never be failed at mis-wiring situation, do I missed anything in my design?