You obviously missed that in my design, pin 1 of the HV5812, the VPP pin, 
is tied to approximately 60 volts. An "off" output then is pulled up to 
60V, which is high enough that the cathode is extinguished, and any leakage 
current is clamped to 60V.

On Tuesday, March 6, 2018 at 8:58:46 AM UTC-8, gregebert wrote:
> Interesting. The HV5812 is a CMOS device rated for 80V, so it will be 
> vulnerable to overstress if the nixie tubes leak (no bleeder resistors are 
> present).
> Has anyone ever had driver failure ? If not, then I guess the blanking 
> time is sufficient enough for charge to decay to a safe level, or the 
> HV5812 is more tolerant of high-voltages than the datasheet indicates (or a 
> combination thereof).

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