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FA402 Round FSR

Ø14.68 mm Active Diameter · Standard Human Touch Sensor

The FA402 is the most widely deployed single-point force sensing resistor for industrial HMI touch control, squeeze triggers, medical drug delivery devices, and micro-switch replacements.

Active Area

Ø14.68 mm

Force Range

Approx. 50 g – 20 kg (customizable)

Outer Dimensions

73.77 mm long / 26.51 mm short; width 18.30 mm

Operating Temp

−20°C to +65°C

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Engineering Specifications

Complete Technical Specifications for FA402

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

Model Identifier	FA402 Standard Round FSR
Product Architecture	Standard Single-Point FSR (Round)
Active Sensing Geometry	Ø14.68 mm
Overall Physical Dimensions	73.77 mm long / 26.51 mm short; width 18.30 mm
Dynamic Force Sensitivity	Approx. 50 g – 20 kg (customizable)
Stand-Off Resistance (Unloaded)	> 1 MΩ
Rise Time Response	< 1 ms
Hysteresis & Repeatability	≤ 5% of full scale
Operating Temperature Range	−20°C to +65°C
Electrical Termination	2-Pin Female Crimp (2.54 mm Pitch)

Hardware Integration

Recommended Interface Circuits for FA402

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

1. Voltage Divider Interface

Connect FA402 in series with a 10 kΩ pull-down resistor to an ADC pin. Simplest approach for touch detection and threshold triggering.

2. Active Op-Amp Inverting Amp (Linear)

Place FA402 in the feedback path of an inverting op-amp. Output voltage scales directly linear with force.

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