FSR Model 404

Interlink invented the Force Sensing Resistor and brought it to market in 1985. The architecture uses a printed interdigitated circuit and conductive layer that decreases resistance as applied force increases, enabling predictable, analog force interpretation in compact form factors.

The standard FSR portfolio includes high-performance options such as the UX 400 series (0.5 N to 150 N), the X 400 series (0.3 N to 50 N), and the original 400 series (0.2 N to 20 N). This range supports design-in across medical interfaces, industrial controls, robotics, and consumer electronics.

For rapid evaluation, Interlink also offers hardware development kits with sensor variations, overlays, and adhesive options so teams can validate force behavior before committing to production geometry and stack-up decisions.