The AC servo version of the LEFB slider features an AC servo motor instead of a DC version. The AC servo motor enables higher speed and acceleration, as well as a size 40 model not available in a DC version. The drivers are pulse input type, with both incremental and absolute encoder options and 17- or 18-bit resolution.

The LEFB is available in a motorless type, permitting the mounting of an AC servo motor other than the standard chosen by SMC.  Shaft coupling and mounting patterns are compatible with 8 servo motor series from 5 manufacturers.  Manufacturers include Mitsubishi, Yaskawa, Sanyo Denki, Omron, and Panasonic.