The FSR 406 is a single-zone Force Sensing Resistor® optimized to use human touch to control devices for use in automotive electronics, medical systems, and industrial and robotics applications, among many others. FSRs are two-wire, robust polymer thick film (PTF) sensors that exhibit a decrease in resistance with increase in force applied to the surface of the sensor. The FSR 406 is laid out in a square configuration with a 34 mm2 active area and is available in two connection options.
Connector options
- Female tin contacts with two-pin housing
- Solder tabs
Highlights:
- 34 mm2 active area
- 83 mm length
- Sensing range from 0.2N to 20N
- Ultrathin form factor
- Easily customizable
What Are FSR Sensors?
At their core, Force Sensing Resistors are devices that produce a decrease in electrical resistance as more physical force or pressure is applied to them—putting them in the broader category of piezoresistive devices. Typical construction consists of a membrane-like flexible substrate that is printed with an interdigitated circuit pattern. When no pressure is applied, the circuit remains open, and electricity is unable to pass from one wire to the other. A spacer is then fixed to this substrate to separate it by a small air gap from the second substrate, which is coated in a conductive ink. When force is applied to the device, the conductive substrate is pressed against the printed circuit substrate, allowing electricity to flow from one wire to the other. The amount of electricity that is able to flow within the circuit depends on the pressure exerted on the FSR, as greater pressure brings more of the conductive material in contact with the wires and ups the electrical output in a predictable way, allowing them to detect changes in force as well.