I'll bite: The datasheet says the HV is controlled by MOSFETs:

"It combines a 20-bit CMOS shift register, data latches and control 
circuitry with high-voltage MOSFET outputs". 

On Tuesday, March 6, 2018 at 11:58:46 AM UTC-5, 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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