> >The ferrite is in the package > > I don't think they have any ferrite in the package. It is not needed. There's "something" Datasheet says - Both tr and tRESPONSE are detrimentally affected by eddy current losses observed in the conductive IC ground plane and, to varying degrees, in the ferrous flux concentrator within the current sensor package -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist