Standard Force Sensing Resistor

FA401-A Sensor

High-Reliability Flexible Tactile Force Sensor

Standard off-the-shelf single-point piezoresistive sensor designed for human-touch HMI, squeeze force measurement, and micro-switch replacement.

Active Area

Ø26.00 mm

Force Range

50 g – 5 kg / 100 g – 10 kg / 200 g – 20 kg (selectable)

Outer Dimensions

50.84 × 31.63 mm

Operating Temp

−20°C to +60°C

Engineering Specifications

Complete Technical Specifications for FA401-A

Full mechanical, electrical, and environmental characteristics verified by factory quality inspection.

Model Identifier	FA401-A Solder-Tab Square FSR
Product Architecture	Standard Single-Point FSR (Square)
Active Sensing Geometry	Ø26.00 mm
Overall Physical Dimensions	50.84 × 31.63 mm
Dynamic Force Sensitivity	50 g – 5 kg / 100 g – 10 kg / 200 g – 20 kg (selectable)
Stand-Off Resistance (Unloaded)	> 1 MΩ
Rise Time Response	< 1 ms
Hysteresis & Repeatability	≤ 5% of full scale
Operating Temperature Range	−20°C to +60°C
Electrical Termination	2-Pin Solder Tabs (2.54 mm)

Hardware Integration

Standard analog conditioning topologies for converting variable resistance into calibrated microcontroller inputs.

Connect FA401-A in series with a 10 kΩ pull-down resistor to an ADC pin. Simplest approach for touch detection and threshold triggering.

Place FA401-A in the feedback path of an inverting op-amp. Output voltage scales directly linear with force.

Our engineering team provides standard evaluation samples, 2D/3D integration layouts, and 24-hour technical consultation.