SN28604N servo driver by Texas Instruments. Package: Unusual 12-pin DIP Download Texas SN28604N (SN76604 *) datasheet: Status: NOS (New Old Stock) ,early originals ! RoHS compliant: no * note: SN76604 is the later 14-pin DIP version, just ignore pins 8 & 9 (NC) as these don't exist the 12-pin DIP. otherwise a pin-for pin replacement.