Searching a component by inscription

Hello all,

I am looking for the component of a current booster.
The inscription on the component reads (see picture):

     LBWZ
     N918
     828

Can anyone tell me what this is? Or at least name the manufacturer or 
narrow it down to a group?
I've spent ages searching the internet but can't find anything....

Thanks a lot :)
Alex

(Here are some additional details about the Current Booster that might 
be helpful:
-the board is used to amplify output currents of digital-analog-
signal converters
- HV-HiL systems can be realized with simple PLC modules )