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STM32L Max Voltage to FT pin while unpowered

Question asked by Dan Hepler on Aug 1, 2014
Latest reply on Sep 4, 2014 by Dan Hepler
Can someone confirm if applying ~5.0V to a 5V tolerant pin on an STM32L151 while unpowered (VDD=0.0V) will damage it?

The latest datasheets specify the Absolute Maximum Ratings are VDD+4.0V for FT pins, but bench testing it appears that I can apply 5.5V to an FT pin while the device is unpowered and when I power it up it works fine.

However... I have received two units that failed and suspect ~5V was applied to FT pins while the microcontroller was unpowered which may have caused the failures.

Thanks in advance.