The advantage is the voltage can be set from about 2 - 36 volts.  The 
datasheet calls it programmable, yet the voltage is set by a resistive 
voltage divider not unlike linear 3-terminal regulators.  These little 
beasties actually make a nifty audio amp as well, directly driving an 8 
ohm speaker or headset.

Joe



Olin Lathrop wrote:
> So now we've got 3 terminal zener diodes to add to the managerie of odd
> components, along with the positive electrons, negative resistors, and NPN
> and PNP FETs?
>
>
> ********************************************************************
> Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
> (978) 742-9014.  Gold level PIC consultants since 2000.
>   

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