# Alpha MF01A Round FSR 14.7 mm (0.3–10 N)

> Alpha MF01A-N-221-A01 round force-sensitive resistor (Adafruit 166): 14.7 mm circular active area, 0.3–9.8 N (30–1000 g) sensitivity, >20 MΩ unloaded, <1 ms response, continuous analog output, 0.56 mm thick, 60.4 × 18.3 mm with tail, 0.9 g, −30 to +85 °C — a fingertip or gripper-pad touch sensor.

- Manufacturer: Alpha (Taiwan Alpha Electronic)
- Part number: MF01A-N-221-A01
- Category: Tactile & touch sensors
- Canonical page: https://www.xirkit.io/products/alpha-mf01a-round-fsr-14-7-mm-0-3-10-n-22e6
- Pinout: https://www.xirkit.io/products/alpha-mf01a-round-fsr-14-7-mm-0-3-10-n-22e6/pinout
- Structured JSON: https://www.xirkit.io/products/alpha-mf01a-round-fsr-14-7-mm-0-3-10-n-22e6/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 | round |
| Active area diameter | 14.7 mm |
| Force range (min) | 0.3 N |
| Force range (max) | 9.8 N |
| Output | analog: resistance falls with force (>20 MΩ unloaded) |
| Interface | analog |
| Thickness | 0.56 mm |
| Weight | 0.9 g |
| Dimensions | 60.4 × 18.33 × 0.56 mm |
| Operating temperature | -30 to 85 °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 |
| --- | --- | --- | --- | --- |
| www.adafruit.com | 3.95 USD | in_stock | 2026-09-29 | https://www.adafruit.com/product/166 |

## FAQ

**How much does the Alpha MF01A Round FSR 14.7 mm cost?**

From $3.95 at www.adafruit.com. Prices are observed unit prices before tax and shipping.

**What are the Alpha MF01A Round FSR 14.7 mm dimensions?**

60.4 × 18.33 × 0.56 mm. A STEP model is available for enclosure fit checks.

**Where does this Alpha MF01A Round FSR 14.7 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

- [Alpha MF01A Round FSR 14.7 mm (0.3–10 N) datasheet](https://cdn-shop.adafruit.com/product-files/166/166_MF01A-A01.pdf)
- [www.adafruit.com listing](https://www.adafruit.com/product/166)

## 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 $3.95
- [Alpha MF02A Square FSR 38 mm (1–49 N)](https://www.xirkit.io/products/alpha-mf02a-square-fsr-38-mm-1-49-n-09b0) — Both serve grasping and manipulation — check the trade-offs; $3.95 vs $5.95