Ultrasonic touch sensor

An ultrasonic touch sensor for attaching to a casing, the ultrasonic touch sensor comprising:

• a housing having a surface and a trough that extends from the surface into a body of the housing, the trough being defined by trough sidewalls and a trough bottom;
• a semiconductor chip having a substrate side and a component side,
• wherein the semiconductor chip is arranged in the trough such that the substrate side of the semiconductor chip is coupled to the trough bottom,
• wherein the semiconductor chip comprises an ultrasonic transducer element that includes a first electrode, a second electrode, and a diaphragm, and
• wherein the ultrasonic transducer element is arranged at the component side;
• an acoustic coupling medium covering the component side of the semiconductor chip at least in a region of the ultrasonic transducer element, wherein the acoustic coupling medium fills at least a portion of the trough;
• electrical contact elements for controlling the ultrasonic transducer element via connections to the first electrode and the second electrode,
• wherein the electrical contact elements are laterally displaced outward from the trough sidewalls such that the semiconductor chip is arranged more distant from the electrical contact elements than from the trough sidewalls;
• and
• conductor tracks electrically coupled to the semiconductor chip and the electrical contact elements.