Description
The Interlink FSR402 is a single-zone Force Sensing Resistor optimized for human touch control applications. It consists of a robust polymer thick film (PTF) construction with a 0.5″ (12.7mm) diameter active area. When force is applied to the sensing surface, the resistance decreases—the harder the press, the lower the resistance. This makes it ideal for detecting relative force (light touch vs. hard press) in applications such as robotic grippers, touch-sensitive interfaces, and interactive installations.
The sensor is a two-wire passive device with no polarity—the two tabs are interchangeable. At rest (no force), resistance is >10 MΩ per the manufacturer’s current specification . Under light pressure, it drops significantly, and at maximum rated force it can fall to around 200Ω. The FSR402 is rated for up to 10 million actuations and is ultra-thin (0.45mm), allowing integration into tight spaces and curved surfaces .
Critical limitations: The FSR402 is not a load cell or strain gauge. It is not suitable for precise weight measurement—the resistance-force relationship is non-linear. While single-part repeatability is excellent (±2%), part-to-part repeatability is ±6% within a single batch . The sensor tabs are heat-sensitive—direct soldering risks melting the plastic substrate; use a breadboard, clamp connector, or terminal block instead.
Features
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Force-Sensitive Resistance: Resistance decreases as applied force increases; simple voltage divider interface.
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0.5″ (12.7mm) Active Area: Compact circular sensing zone for fingertip or small-object pressure detection.
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Ultra-Thin Construction (0.45mm): Flexible and low-profile for embedded and wearable applications .
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High Durability: Rated for up to 10 million actuations .
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Wide Force Range: Sensitivity from approximately 0.2N to 20N per Interlink’s 400 Series specification .
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Fast Response Time: Approximately 3µs .
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Two-Wire Passive Interface: No polarity; no power supply required for the sensing element.
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Short-Tail Variant: The “Short” designation indicates the compact connector tail version (model 30-81794) .
Technical Specifications
| Parameter | Specification |
|---|---|
| Active Area | 0.5″ (12.7mm) diameter |
| Thickness | 0.45mm |
| Force Range (400 Series) | ~0.2N – 20N |
| No-Load Resistance | >10 MΩ |
| Minimum Resistance (at max force) | ~200Ω |
| Response Time | ~3µs |
| Durability | Up to 10 million actuations |
| Force Repeatability (Single Part) | ±2% |
| Force Repeatability (Part to Part) | ±6% (single batch) |
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