I require a make before break analogue switch for a project I am working on. The problem as I have been finding out is that the majority of the analogue switches are Break before make (BBM). For example Analog produces the ADG619 and ADG620 switches. The ADG619 (BBM version) can be easily bought from places like Farnell, but the MBB version ADG620 is no where to be found. The switch I need is a SPDT which can handle both positive and negative signals, as well as being MBB. Has anyone came across this problem? any component suggestions?