Description
The Interlink FSR408 is a single-zone Force Sensing Resistor in a long strip format, designed for applications requiring force sensing over an extended linear area. Unlike the compact round FSR400/402 or square FSR406, the FSR408’s strip geometry makes it suitable for detecting pressure along a line—such as seat occupancy detection, edge sensing, or custom sensing strips that can be cut to length .
The sensor is a robust polymer thick film (PTF) device that exhibits a decrease in resistance with increasing force applied to its surface . It is ultra-thin (approximately 0.41mm) and flexible, allowing integration into tight spaces and curved surfaces . The standard length is approximately 622.3mm overall (with a 609.6mm × 10.2mm active area), and distributors note that the strip can be cut down to shorter lengths for custom applications .
Critical limitations: The FSR408 is not a precision load cell. Its resistance-force relationship is non-linear, and force repeatability varies. The force range depends on the specific variant: Rapid Electronics lists 0.2N to 20N , while DigiKey’s older highlight lists 0.1N to 10N . The connection tabs are heat-sensitive—soldering directly to the sensor can damage the substrate. Use a clamp connector or terminal block instead.
Features
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Long Strip Format: Extended linear sensing area (approximately 609.6mm × 10.2mm) suitable for edge or line pressure detection .
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Cuttable to Length: Distributors confirm the strip can be shortened for custom applications .
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Force-Sensitive Resistance: Resistance decreases with applied force; simple voltage divider interface .
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Ultra-Thin Construction: Approximately 0.41mm profile for low-profile integration .
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High Durability: Rated for up to 10 million actuations .
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Two-Wire Passive Interface: No polarity; no power supply required for the sensing element.
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Genuine Interlink Component: Original PTF sensor from the company that invented FSR technology .
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Multiple Length Options: Interlink offers the FSR408 in lengths from 50mm to 610mm .
Technical Specifications
| Parameter | Specification (FSR408 Strip) |
|---|---|
| Active Area | ~609.6mm × 10.2mm |
| Overall Length | ~622.3mm |
| Thickness | ~0.41mm |
| Force Range | 0.2N – 20N (Rapid Electronics) ; 0.1N – 10N (older DigiKey highlight) |
| Actuating Force | 0.2N (minimum) |
| Response Time | ~3µs |
| Durability | Up to 10 million actuations |
| Operating Temperature | -40°C to +85°C (typical FSR family) |
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