The M51660L is a semiconductor integrated circuit for use in servo motor control in radio control applications. Housed in a 14-pin molded plastic zig-zag inline package (ZIP), the M51660L contributes to the miniaturization of the set. The b uilt-in voltage r egulating c ircuit, a nd the differential comparator used in the comparator circuit provide the M51660L with e xtremely stable p ower supply v oltage fluctuation characteristics and temperature change characteristics.