{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "adafruit-stemma-qt-breakouts",
 "name": "Adafruit STEMMA QT sensor breakouts (BME280, BNO055/085, VL53, SCD-40, AHT20, SHT40, IMUs, light, magnet, RTC…)",
 "kind": "modern",
 "category": "Electronics",
 "group": "Modules & cameras",
 "year": null,
 "question": "What are the dimensions of Adafruit STEMMA QT breakout boards?",
 "tags": [
  "stemma qt",
  "qwiic",
  "sensor",
  "breakout",
  "adafruit"
 ],
 "aliases": [
  "stemma qt board size",
  "qwiic breakout dimensions",
  "bme280 breakout dimensions",
  "bno055 stemma",
  "vl53l4cd",
  "scd40 breakout",
  "adafruit breakout mounting holes"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": true,
 "xem_status": "free-files",
 "les": false,
 "free_files": 33,
 "url": "https://xemstudio.com/objects/adafruit-stemma-qt-breakouts/",
 "sheet_txt": "https://xemstudio.com/objects/adafruit-stemma-qt-breakouts/sheet.txt",
 "sheet": {
  "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",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "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."
  ],
  "table": {
   "columns": [
    "product",
    "bbox_l_mm",
    "bbox_w_mm",
    "bbox_h_mm"
   ],
   "rows": [
    [
     "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
    ],
    [
     "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
    ],
    [
     "3967 VL5SL1X TOF Sensor",
     25.4,
     17.8,
     4.5
    ],
    [
     "4415 Mini GPS PA1010D",
     25.4,
     25.4,
     12
    ],
    [
     "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
    ]
   ]
  }
 },
 "sheet_text": "Adafruit STEMMA QT sensor breakouts (BME280, BNO055/085, VL53, SCD-40, AHT20, SHT40, IMUs, light, magnet, RTC…) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/adafruit-stemma-qt-breakouts/  (CC BY 4.0)\nBasis: 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\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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.\n- 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).\n- Cable: STEMMA QT / Qwiic JST SH cables need 8 mm of clearance beyond the connector for the plug and strain relief.\n\nproduct  bbox_l_mm  bbox_w_mm  bbox_h_mm\n2652 Adafruit BME280  25.4  17.8  4.5\n4646 BNO055 Stemma  25.4  20.3  4.5\n4754 BNO085 STEMMA QT  25.4  22.9  4.5\n5396 VL53L4CD Sensor  25.4  17.8  4.5\n5187 SCD-40 C02 Sensor  25.4  22.9  7.9\n4566 AHT20 Sensor  25.4  17.8  4.5\n4885 SHT40 Sensor  25.4  17.8  4.5\n2809 LIS3DH  25.4  17.8  4.5\n4502 6DoF IMU  25.4  17.8  4.5\n5378 VEML7700 Lux Sensor  25.4  17.8  4.5\n3595 APDS9960 Sensor  25.4  17.8  4.5\n5188 DS3231 RTC  25.4  17.8  7.7\n904 INA219 Stemma  25.4  20.3  4.5\n5626 PCA9548 Stemma  40.6  20.3  4.5\n1085 ADS1115 ADC  25.4  17.8  4.5\n5346 MCP23017 Expander  43.2  17.8  4.5\n6357 AS5600 Magnetic Sensor  25.4  17.8  4.5\n4698 AS7341 Light Color Sensor  25.4  17.8  4.5\n4469 MLX90640 Stemma  25.4  17.8  11.7\n4632 PMSA003I  50.8  35.6  14.0\n4097 ADXL343 Accelerometer  25.4  17.8  4.5\n4494 DPS310 Sensor  25.4  17.8  4.5\n4816 BMP390 QT  25.4  17.8  4.5\n3660 BME680  25.4  17.8  4.5\n5046 BME688 Sensor  25.4  17.8  4.5\n4867 SCD-30 C02 Sensor  50.8  25.4  11.5\n4161 VCNL4040 Sensor  25.4  17.8  4.5\n4022 Wide-Range Triple-axis Magnetometer MLX90393  22.9  19.1  3.0\n3967 VL5SL1X TOF Sensor  25.4  17.8  4.5\n4415 Mini GPS PA1010D  25.4  25.4  12.0\n5579 MMC5603 Magnetometer  25.4  17.8  4.5\n5832 INA228 STEMMA QT  25.4  20.3  12.1\n6062 INA3221 Power Monitor  38.4  22.9  11.9\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Adafruit (official): Adafruit_CAD_Parts: STEP, Fusion 360 and STL for Adafruit products — STEP, F3D, STL — MIT — https://github.com/adafruit/Adafruit_CAD_Parts\n\nFree files (MIT License (Adafruit_CAD_Parts), Adafruit Industries; STEP + STL, 33 parts): https://xemstudio.com/files/adafruit/adafruit-stemma-qt-breakouts/index.json\nAPI: https://xemstudio.com/api/geometry?object=adafruit-stemma-qt-breakouts\n",
 "sources": [
  {
   "publisher": "Adafruit (official)",
   "title": "Adafruit_CAD_Parts: STEP, Fusion 360 and STL for Adafruit products",
   "url": "https://github.com/adafruit/Adafruit_CAD_Parts",
   "formats": [
    "STEP",
    "F3D",
    "STL"
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   "license": "MIT",
   "license_verified": true,
   "hosted": false
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  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
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 "related": [
  "jst-connectors",
  "raspberry-pi-pico",
  "adafruit-qt-py-itsybitsy-trinket",
  "pin-headers-2.54mm"
 ],
 "faq": [
  {
   "q": "What size are Adafruit STEMMA QT breakouts?",
   "a": "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."
  },
  {
   "q": "What connector is STEMMA QT?",
   "a": "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."
  }
 ],
 "files_license": {
  "name": "MIT License (Adafruit_CAD_Parts)",
  "holder": "Adafruit Industries",
  "url": "https://github.com/adafruit/Adafruit_CAD_Parts/blob/main/LICENSE",
  "note": "Direct links to Adafruit's own CAD repository on GitHub (MIT). Xem Studio computed the bounding boxes from the STEP files and hosts nothing. Adafruit does not endorse this site."
 },
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}