Abstract: An interdigital surface acoustic wave transducer comprises a substrate having at least two areas. One area has piezoelectric properties. Laid down on it is a main row with electrodes. The other area has no piezoelectric properties and carries an additional row with electrodes. Each row comprises two groups of electrodes arranged in parallel with one another. The electrodes of first groups of the rows are connected electrically to respective current-conducting pads. The electrodes of second groups of the rows are connected conductively to one another and are positioned between the electrodes of the first groups of the rows. As a result, overlap portions of the electrodes of the two groups are formed which have a constant length in the main row and a variable length in the additional row.