# Adafruit STEMMA QT sensor breakouts (BME280, BNO055/085, VL53, SCD-40, AHT20, SHT40, IMUs, light, magnet, RTC…)

> What are the dimensions of Adafruit STEMMA QT breakout boards?

- Category: Electronics › Modules & cameras
- Kind: Modern device
- Basis: Adafruit CAD (MIT); most STEMMA QT breakouts are 25.4 × 17.8 mm (1.0 × 0.7 in) with two Ø2.5 mm holes 20.3 mm apart, JST SH 4-pin connectors on both short ends
- Page: https://xemstudio.com/objects/adafruit-stemma-qt-breakouts/ · JSON: https://xemstudio.com/api/geometry?object=adafruit-stemma-qt-breakouts · Plain text: https://xemstudio.com/objects/adafruit-stemma-qt-breakouts/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Notes

- The common STEMMA QT breakout: 25.4 × 17.8 mm, two Ø2.5 mm holes on 20.3 mm centres (0.8 in) along the long axis, 2.54 mm header row on one long edge, JST SH 1.0 mm 4-pin at each end; 1.6 mm PCB, 4–6 mm tall with connectors.
- Larger ones: SCD-40 (33 × 25.4), MLX90640 thermal camera (25.4 × 25.4), PMSA003I air quality adapter (38 × 25), PCA9548 mux (33 × 17.8).
- Cable: STEMMA QT / Qwiic JST SH cables need 8 mm of clearance beyond the connector for the plug and strain relief.

## Sizes

| product | bbox_l_mm | bbox_w_mm | bbox_h_mm |
|---|---|---|---|
| 2652 Adafruit BME280 | 25.4 | 17.8 | 4.5 |
| 4646 BNO055 Stemma | 25.4 | 20.3 | 4.5 |
| 4754 BNO085 STEMMA QT | 25.4 | 22.9 | 4.5 |
| 5396 VL53L4CD Sensor | 25.4 | 17.8 | 4.5 |
| 5187 SCD-40 C02 Sensor | 25.4 | 22.9 | 7.9 |
| 4566 AHT20 Sensor | 25.4 | 17.8 | 4.5 |
| 4885 SHT40 Sensor | 25.4 | 17.8 | 4.5 |
| 2809 LIS3DH | 25.4 | 17.8 | 4.5 |
| 4502 6DoF IMU | 25.4 | 17.8 | 4.5 |
| 5378 VEML7700 Lux Sensor | 25.4 | 17.8 | 4.5 |
| 3595 APDS9960 Sensor | 25.4 | 17.8 | 4.5 |
| 5188 DS3231 RTC | 25.4 | 17.8 | 7.7 |
| 904 INA219 Stemma | 25.4 | 20.3 | 4.5 |
| 5626 PCA9548 Stemma | 40.6 | 20.3 | 4.5 |
| 1085 ADS1115 ADC | 25.4 | 17.8 | 4.5 |
| 5346 MCP23017 Expander | 43.2 | 17.8 | 4.5 |
| 6357 AS5600 Magnetic Sensor | 25.4 | 17.8 | 4.5 |
| 4698 AS7341 Light Color Sensor | 25.4 | 17.8 | 4.5 |
| 4469 MLX90640 Stemma | 25.4 | 17.8 | 11.7 |
| 4632 PMSA003I | 50.8 | 35.6 | 14.0 |
| 4097 ADXL343 Accelerometer | 25.4 | 17.8 | 4.5 |
| 4494 DPS310 Sensor | 25.4 | 17.8 | 4.5 |
| 4816 BMP390 QT | 25.4 | 17.8 | 4.5 |
| 3660 BME680 | 25.4 | 17.8 | 4.5 |
| 5046 BME688 Sensor | 25.4 | 17.8 | 4.5 |
| 4867 SCD-30 C02 Sensor | 50.8 | 25.4 | 11.5 |
| 4161 VCNL4040 Sensor | 25.4 | 17.8 | 4.5 |
| 4022 Wide-Range Triple-axis Magnetometer MLX90393 | 22.9 | 19.1 | 3.0 |
| 3967 VL5SL1X TOF Sensor | 25.4 | 17.8 | 4.5 |
| 4415 Mini GPS PA1010D | 25.4 | 25.4 | 12.0 |
| 5579 MMC5603 Magnetometer | 25.4 | 17.8 | 4.5 |
| 5832 INA228 STEMMA QT | 25.4 | 20.3 | 12.1 |
| 6062 INA3221 Power Monitor | 38.4 | 22.9 | 11.9 |

## Where the files are

- Adafruit (official): [Adafruit_CAD_Parts: STEP, Fusion 360 and STL for Adafruit products](https://github.com/adafruit/Adafruit_CAD_Parts) — STEP, F3D, STL — MIT

## Free STEP/STL (33 parts, MIT License (Adafruit_CAD_Parts), Adafruit Industries)

Index: https://xemstudio.com/files/adafruit/adafruit-stemma-qt-breakouts/index.json

- 2652-adafruit-bme280: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/2652%20Adafruit%20BME280/2652%20BMP280%20STEMMA%20QT.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/2652%20Adafruit%20BME280/2652%20BMP280%20STEMMA%20QT.stl) — Adafruit #2652 Adafruit BME280; bbox 25.4 × 17.8 × 4.5 mm; 0.9 MB on GitHub
- 4646-bno055-stemma: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4646%20BNO055%20Stemma/4646%20BNO055%20Stemma.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4646%20BNO055%20Stemma/4646%20BNO055%20Stemma.stl) — Adafruit #4646 BNO055 Stemma; bbox 25.4 × 20.3 × 4.5 mm; 1.2 MB on GitHub
- 4754-bno085-stemma-qt: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4754%20BNO085%20STEMMA%20QT/4754%20BNO085%20STEMMA%20QT.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4754%20BNO085%20STEMMA%20QT/4754%20BNO085%20STEMMA%20QT.stl) — Adafruit #4754 BNO085 STEMMA QT; bbox 25.4 × 22.9 × 4.5 mm; 1.6 MB on GitHub
- 5396-vl53l4cd-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5396%20VL53L4CD%20Sensor/5396%20Adafruit%20VL53L4CD.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5396%20VL53L4CD%20Sensor/5396%20Adafruit%20VL53L4CD.stl) — Adafruit #5396 VL53L4CD Sensor; bbox 25.4 × 17.8 × 4.5 mm; 0.8 MB on GitHub
- 5187-scd-40-c02-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5187%20SCD-40%20C02%20Sensor/5187%20SCD-40%20C02%20Sensor.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5187%20SCD-40%20C02%20Sensor/5187%20SCD-40%20C02%20Sensor.stl) — Adafruit #5187 SCD-40 C02 Sensor; bbox 25.4 × 22.9 × 7.9 mm; 1.0 MB on GitHub
- 4566-aht20-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4566%20AHT20%20Sensor/4566-AHT20-Sensor.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4566%20AHT20%20Sensor/4566-AHT20-Sensor.stl) — Adafruit #4566 AHT20 Sensor; bbox 25.4 × 17.8 × 4.5 mm; 0.5 MB on GitHub
- 4885-sht40-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4885%20SHT40%20Sensor/4485%20SHT40.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4885%20SHT40%20Sensor/4485%20SHT40.stl) — Adafruit #4885 SHT40 Sensor; bbox 25.4 × 17.8 × 4.5 mm; 0.8 MB on GitHub
- 2809-lis3dh: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/2809%20LIS3DH/2809%20LIS3DH.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/2809%20LIS3DH/2809%20LIS3DH.stl) — Adafruit #2809 LIS3DH; bbox 25.4 × 17.8 × 4.5 mm; 1.0 MB on GitHub
- 4502-6dof-imu: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4502%206DoF%20IMU/4502%206DoF%20IMU.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4502%206DoF%20IMU/4502%206DoF%20IMU.stl) — Adafruit #4502 6DoF IMU; bbox 25.4 × 17.8 × 4.5 mm; 0.8 MB on GitHub
- 5378-veml7700-lux-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5378%20VEML7700%20Lux%20Sensor/5378%20VEML7700%20Lux%20Sensor.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5378%20VEML7700%20Lux%20Sensor/5378%20VEML7700%20Lux%20Sensor.stl) — Adafruit #5378 VEML7700 Lux Sensor; bbox 25.4 × 17.8 × 4.5 mm; 0.8 MB on GitHub
- 3595-apds9960-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/3595%20APDS9960%20Sensor/3595%20APDS9960%20Sensor.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/3595%20APDS9960%20Sensor/3595%20APDS9960%20Sensor.stl) — Adafruit #3595 APDS9960 Sensor; bbox 25.4 × 17.8 × 4.5 mm; 0.7 MB on GitHub
- 5188-ds3231-rtc: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5188%20DS3231%20RTC/5188%20DS3231%20RTC.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5188%20DS3231%20RTC/5188%20DS3231%20RTC.stl) — Adafruit #5188 DS3231 RTC; bbox 25.4 × 17.8 × 7.7 mm; 0.9 MB on GitHub
- 904-ina219-stemma: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/904%20INA219%20Stemma/904%20INA219%20Stemma.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/904%20INA219%20Stemma/904%20INA219%20Stemma.stl) — Adafruit #904 INA219 Stemma; bbox 25.4 × 20.3 × 4.5 mm; 0.6 MB on GitHub
- 5626-pca9548-stemma: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5626%20PCA9548%20Stemma/5626%20PCA9548%20Stemma.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5626%20PCA9548%20Stemma/5626%20PCA9548%20Stemma.stl) — Adafruit #5626 PCA9548 Stemma; bbox 40.6 × 20.3 × 4.5 mm; 1.4 MB on GitHub
- 1085-ads1115-adc: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/1085%20ADS1115%20ADC/1085%20ADS1115%20ADC.step) — Adafruit #1085 ADS1115 ADC; bbox 25.4 × 17.8 × 4.5 mm; 0.6 MB on GitHub
- 5346-mcp23017-expander: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5346%20MCP23017%20Expander/5346-MCP23017-Expander.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5346%20MCP23017%20Expander/5346-MCP23017-Expander.stl) — Adafruit #5346 MCP23017 Expander; bbox 43.2 × 17.8 × 4.5 mm; 0.7 MB on GitHub
- 6357-as5600-magnetic-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/6357%20AS5600%20Magnetic%20Sensor/6357%20AS5600%20Magnetic%20Sensor.step) — Adafruit #6357 AS5600 Magnetic Sensor; bbox 25.4 × 17.8 × 4.5 mm; 0.9 MB on GitHub
- 4698-as7341-light-color-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4698%20AS7341%20Light%20Color%20Sensor/4698%20AS7341%20Light%20Color%20Sensor.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4698%20AS7341%20Light%20Color%20Sensor/4698%20AS7341%20Light%20Color%20Sensor.stl) — Adafruit #4698 AS7341 Light Color Sensor; bbox 25.4 × 17.8 × 4.5 mm; 1.0 MB on GitHub
- 4469-mlx90640-stemma: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4469%20MLX90640%20Stemma/4469%20MLX90640%20Stemma.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4469%20MLX90640%20Stemma/4469%20MLX90640%20Stemma.stl) — Adafruit #4469 MLX90640 Stemma; bbox 25.4 × 17.8 × 11.7 mm; 0.7 MB on GitHub
- 4632-pmsa003i: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4632%20PMSA003I/4632%20PMSA003I.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4632%20PMSA003I/4632%20PMSA003I.stl) — Adafruit #4632 PMSA003I; bbox 50.8 × 35.6 × 14.0 mm; 1.4 MB on GitHub
- 4097-adxl343-accelerometer: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4097%20ADXL343%20Accelerometer/4097%20ADXL343%20STEMMA%20QT.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4097%20ADXL343%20Accelerometer/4097%20ADXL343%20STEMMA%20QT.stl) — Adafruit #4097 ADXL343 Accelerometer; bbox 25.4 × 17.8 × 4.5 mm; 0.9 MB on GitHub
- 4494-dps310-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4494%20DPS310%20Sensor/4494-DPS310-Sensor.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4494%20DPS310%20Sensor/4494-DPS310-Sensor.stl) — Adafruit #4494 DPS310 Sensor; bbox 25.4 × 17.8 × 4.5 mm; 0.8 MB on GitHub
- 4816-bmp390-qt: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4816%20BMP390%20QT/4816%20BMP390%20QT.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4816%20BMP390%20QT/4816%20BMP390%20QT.stl) — Adafruit #4816 BMP390 QT; bbox 25.4 × 17.8 × 4.5 mm; 0.8 MB on GitHub
- 3660-bme680: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/3660%20BME680/3660%20BME680.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/3660%20BME680/3660%20BME680.stl) — Adafruit #3660 BME680; bbox 25.4 × 17.8 × 4.5 mm; 0.9 MB on GitHub
- 5046-bme688-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5046%20BME688%20Sensor/5046%20BME688%20Sensor.step) — Adafruit #5046 BME688 Sensor; bbox 25.4 × 17.8 × 4.5 mm; 0.8 MB on GitHub
- 4867-scd-30-c02-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4867%20SCD-30%20C02%20Sensor/4867%20Adafruit%20SCD30.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4867%20SCD-30%20C02%20Sensor/4867%20Adafruit%20SCD30.stl) — Adafruit #4867 SCD-30 C02 Sensor; bbox 50.8 × 25.4 × 11.5 mm; 2.5 MB on GitHub
- 4161-vcnl4040-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4161%20VCNL4040%20Sensor/4161%20VCNL4040%20Sensor.step) — Adafruit #4161 VCNL4040 Sensor; bbox 25.4 × 17.8 × 4.5 mm; 0.7 MB on GitHub
- 4022-wide-range-triple-axis-magnetometer-mlx90393: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4022%20Wide-Range%20Triple-axis%20Magnetometer%20MLX90393/4022%20Wide-Range%20Triple-axis%20Magnetometer%20MLX90393.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4022%20Wide-Range%20Triple-axis%20Magnetometer%20MLX90393/4022%20Wide-Range%20Triple-axis%20Magnetometer%20MLX90393.stl) — Adafruit #4022 Wide-Range Triple-axis Magnetometer MLX90393; bbox 22.9 × 19.1 × 3.0 mm; 0.7 MB on GitHub
- 3967-vl5sl1x-tof-sensor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/3967%20VL5SL1X%20TOF%20Sensor/3967%20VL5SL1X%20TOF%20Sensor.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/3967%20VL5SL1X%20TOF%20Sensor/3967%20VL5SL1X%20TOF%20Sensor.stl) — Adafruit #3967 VL5SL1X TOF Sensor; bbox 25.4 × 17.8 × 4.5 mm; 1.0 MB on GitHub
- 4415-mini-gps-pa1010d: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4415%20Mini%20GPS%20PA1010D/4415%20Mini%20GPS%20PA1010D.step) — Adafruit #4415 Mini GPS PA1010D; bbox 25.4 × 25.4 × 12.0 mm; 1.4 MB on GitHub
- 5579-mmc5603-magnetometer: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5579%20MMC5603%20Magnetometer/5579%20MMC5603%20Magnetometer.step) — Adafruit #5579 MMC5603 Magnetometer; bbox 25.4 × 17.8 × 4.5 mm; 0.7 MB on GitHub
- 5832-ina228-stemma-qt: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5832%20INA228%20STEMMA%20QT/5832%20INA228%20STEMMA%20QT.step) · [STL](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/5832%20INA228%20STEMMA%20QT/5832%20INA228%20STEMMA%20QT.stl) — Adafruit #5832 INA228 STEMMA QT; bbox 25.4 × 20.3 × 12.1 mm; 1.2 MB on GitHub
- 6062-ina3221-power-monitor: [STEP](https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/6062%20INA3221%20Power%20Monitor/6062%20INA3221%20Power%20Monitor.step) — Adafruit #6062 INA3221 Power Monitor; bbox 38.4 × 22.9 × 11.9 mm; 1.5 MB on GitHub

## Questions

**What size are Adafruit STEMMA QT breakouts?**

Most are 25.4 × 17.8 mm with two Ø2.5 mm holes 20.3 mm apart; the same footprint as SparkFun Qwiic 1 × 1 in boards minus the width.

**What connector is STEMMA QT?**

JST SH 1.0 mm pitch, 4 pin (same as Qwiic); two per board so they daisy-chain. The larger STEMMA (not QT) is JST PH 2.0 mm, 3 or 4 pin.

## Fits with

- [JST PH, XH, EH and GH connectors, 2–8 pin](https://xemstudio.com/objects/jst-connectors/)
- [Raspberry Pi Pico](https://xemstudio.com/objects/raspberry-pi-pico/)
- [Adafruit QT Py, ItsyBitsy, Trinket, GEMMA and Trinkey boards](https://xemstudio.com/objects/adafruit-qt-py-itsybitsy-trinket/)
- [2.54 mm pin headers, 1×2 to 2×20, vertical and right-angle](https://xemstudio.com/objects/pin-headers-2.54mm/)