# Interlink FSR 406 Square FSR 38 mm

> Interlink FSR 406 square force-sensitive resistor (SparkFun SEN-09376): 38.1 × 38.1 mm active area on a 43.69 mm square, 0.1–10 N sensitivity, 0.1 N actuation, ±2 % single-part repeatability, >10 MΩ unloaded, <3 µs rise, −30 to +70 °C, 10 million actuations, 0.54 mm thick, two 0.1 in pins. A palm-sized pad for robot feet contact, grip and seat/bed presence sensing.

- Manufacturer: Interlink Electronics
- Part number: 30-73258
- Category: Tactile & touch sensors
- Canonical page: https://www.xirkit.io/products/interlink-fsr-406-square-fsr-38-mm-388a
- Pinout: https://www.xirkit.io/products/interlink-fsr-406-square-fsr-38-mm-388a/pinout
- Structured JSON: https://www.xirkit.io/products/interlink-fsr-406-square-fsr-38-mm-388a/data.json
- Source: Xirkit structured parts catalog — every value traced to a cited document; unknowns are explicit.

## Key specifications

| Property | Value |
| --- | --- |
| Sensing | force sensitive resistor |
| Active area shape | square |
| Active area length | 38.1 mm |
| Active area width | 38.1 mm |
| Force range (min) | 0.1 N |
| Force range (max) | 10 N |
| Output | analog: resistance falls with force (>10 MΩ unloaded) |
| Interface | analog |
| Thickness | 0.54 mm |
| Dimensions | 83.06 × 43.69 × 0.54 mm |
| Operating temperature | -30 to 70 °C |

## Pinout (2 pins, 0 with electrical limits)

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| T1 | — | terminal | — | t1 | — | — | — | — | — | — | — |
| T2 | — | terminal | — | t2 | — | — | — | — | — | — | — |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| SparkFun | 17.5 USD | unknown | 2026-10-01 | https://www.sparkfun.com/products/9376 |

## FAQ

**How much does the Interlink FSR 406 Square FSR 38 mm cost?**

From $17.5 at SparkFun. Prices are observed unit prices before tax and shipping.

**What are the Interlink FSR 406 Square FSR 38 mm dimensions?**

83.06 × 43.69 × 0.54 mm. A STEP model is available for enclosure fit checks.

**Where does this Interlink FSR 406 Square FSR 38 mm data come from?**

Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.

## Sources

- [Interlink FSR 406 Square FSR 38 mm datasheet](https://cdn.sparkfun.com/assets/c/4/6/8/b/2010-10-26-DataSheet-FSR406-Layout2.pdf)
- [SparkFun listing](https://www.sparkfun.com/products/9376)

## Part graph

### Alternatives (by use case)

- [Interlink FSR 408 Long Strip, 24 in](https://www.xirkit.io/products/interlink-fsr-408-long-strip-24-in-d29d) — Both serve grasping and manipulation — check the trade-offs; $19.95 vs $17.5
- [Interlink FSR 402 Round FSR 12.7 mm](https://www.xirkit.io/products/interlink-fsr-402-round-fsr-12-7-mm-3272) — Both serve grasping and manipulation — check the trade-offs; $17.5 vs $10.95
- [Interlink FSR 400 Small Round FSR 5 mm](https://www.xirkit.io/products/interlink-fsr-400-small-round-fsr-5-mm-9120) — Both serve grasping and manipulation — check the trade-offs; $10.95 vs $17.5
- [Seeed Grove Round Force Sensor (FSR402)](https://www.xirkit.io/products/seeed-grove-round-force-sensor-fsr402-ede8) — Both serve grasping and manipulation — check the trade-offs; $14.9 vs $17.5