# Alpha MF02A Square FSR 38 mm (1–49 N)

> Alpha MF02A-N-221-A01 square force-sensitive resistor (Adafruit 1075, replaces the Interlink FSR406): 38 mm square sensing region, 1–49 N sensitivity, analog resistance output, 0.55 mm thick, 87.2 × 43.7 mm with tail, 2.2 g — a palm, foot or gripper-pad pressure sensor.

- Manufacturer: Alpha (Taiwan Alpha Electronic)
- Part number: MF02A-N-221-A01
- Category: Tactile & touch sensors
- Canonical page: https://www.xirkit.io/products/alpha-mf02a-square-fsr-38-mm-1-49-n-09b0
- Pinout: https://www.xirkit.io/products/alpha-mf02a-square-fsr-38-mm-1-49-n-09b0/pinout
- Structured JSON: https://www.xirkit.io/products/alpha-mf02a-square-fsr-38-mm-1-49-n-09b0/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 mm |
| Active area width | 38 mm |
| Force range (min) | 1 N |
| Force range (max) | 49 N |
| Output | analog: resistance falls with force |
| Interface | analog |
| Thickness | 0.55 mm |
| Weight | 2.2 g |
| Dimensions | 87.18 × 43.7 × 0.55 mm |

## 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 |
| --- | --- | --- | --- | --- |
| www.adafruit.com | 5.95 USD | in_stock | 2026-09-29 | https://www.adafruit.com/product/1075 |

## FAQ

**How much does the Alpha MF02A Square FSR 38 mm (1–49 N) cost?**

From $5.95 at www.adafruit.com. Prices are observed unit prices before tax and shipping.

**What are the Alpha MF02A Square FSR 38 mm (1–49 N) dimensions?**

87.18 × 43.7 × 0.55 mm. A STEP model is available for enclosure fit checks.

**Where does this Alpha MF02A Square FSR 38 mm (1–49 N) 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

- [Alpha MF02A Square FSR 38 mm (1–49 N) datasheet](https://www.adafruit.com/product/1075)
- [www.adafruit.com listing](https://www.adafruit.com/product/1075)

## Part graph

### Alternatives (by use case)

- [Adafruit AT42QT1010 Capacitive Touch (momentary)](https://www.xirkit.io/products/adafruit-at42qt1010-capacitive-touch-momentary-ba53) — Both serve touch and force sensing — check the trade-offs; $5.95 vs $5.95
- [Alpha MF01A Round FSR 14.7 mm (0.3–10 N)](https://www.xirkit.io/products/alpha-mf01a-round-fsr-14-7-mm-0-3-10-n-22e6) — Both serve grasping and manipulation — check the trade-offs; $3.95 vs $5.95
- [Adafruit MPR121 12-Key Capacitive Touch](https://www.xirkit.io/products/adafruit-mpr121-12-key-capacitive-touch-b241) — Both serve touch and force sensing — check the trade-offs; $5.95 vs $7.95