I calculate a 470nF/250vAC Cap would give you 20mA from a 60Hz source... a 220nF just under 10mA... both of those have a footprint the same as a VB408 with a decent Heatsink... and remember the VB408 needed a DC input (so you would have had to rectify and smooth the AC supply) - whereas with a Cap, you're rectifying and smoothing at a much lower voltage - so you win in the size of all the other components. An X2 Cap will also fail safe... a VB408 removes your fingertips...