{
 "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-qt-py-itsybitsy-trinket",
 "name": "Adafruit QT Py, ItsyBitsy, Trinket, GEMMA and Trinkey boards",
 "kind": "modern",
 "category": "Electronics",
 "group": "Microcontroller boards",
 "year": null,
 "question": "What are the QT Py and ItsyBitsy board dimensions?",
 "tags": [
  "qt py",
  "itsybitsy",
  "trinket",
  "gemma",
  "adafruit",
  "board"
 ],
 "aliases": [
  "qt py dimensions",
  "qtpy rp2040",
  "itsybitsy m4",
  "trinket m0",
  "gemma m0",
  "kb2040",
  "neo trinkey"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": true,
 "xem_status": "free-files",
 "les": false,
 "free_files": 18,
 "url": "https://xemstudio.com/objects/adafruit-qt-py-itsybitsy-trinket/",
 "sheet_txt": "https://xemstudio.com/objects/adafruit-qt-py-itsybitsy-trinket/sheet.txt",
 "sheet": {
  "basis": "Adafruit CAD (MIT): QT Py 21.8 × 17.8 mm (0.86 × 0.7 in), ItsyBitsy 36 × 18 mm (1.4 × 0.7 in), Trinket M0 27 × 15.3 mm, GEMMA M0 Ø27.9 mm",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "QT Py (every variant: SAMD21, RP2040, ESP32-S2/S3/C3/PICO): 21.8 × 17.8 mm, USB-C at one end, STEMMA QT JST SH at the other, no mounting holes; cases hold it by the edge with a 0.3 mm lip.",
   "ItsyBitsy: 36 × 18 mm, 28 pins on 2.54 mm pitch, no holes. Trinket M0: 27 × 15.3 mm with two Ø2.5 holes. GEMMA M0: Ø27.9 mm round with three large sew pads.",
   "Trinkeys are USB-A plug boards (~34 × 18 mm with the plug); KB2040 is a Pro Micro footprint (33 × 18 mm, 24 pins)."
  ],
  "table": {
   "columns": [
    "product",
    "bbox_l_mm",
    "bbox_w_mm",
    "bbox_h_mm"
   ],
   "rows": [
    [
     "4600 QT Py",
     21.8,
     17.8,
     6.3
    ],
    [
     "4900 QTPy RP2040",
     21.8,
     17.8,
     5.9
    ],
    [
     "5426 QT Py ESP32-S3",
     21.8,
     17.8,
     5.9
    ],
    [
     "5395 QT Py ESP32 PICO",
     21.7,
     17.8,
     5.6
    ],
    [
     "5325 QTPy ESP32S2",
     21.7,
     17.8,
     5.9
    ],
    [
     "5405 QTPy ESP32 C3",
     21.7,
     17.8,
     5.9
    ],
    [
     "3800 ItsyBitsy M4",
     36,
     17.8,
     4.3
    ],
    [
     "4888 ItsyBitsy RP2040",
     36.1,
     17.8,
     4.3
    ],
    [
     "4481 ItsyBitsy nRF52840",
     36.2,
     17.8,
     5.7
    ],
    [
     "5889 ItsyBitsy ESP32",
     36.1,
     17.8,
     7.4
    ],
    [
     "3500 Trinket M0",
     27.2,
     15.2,
     3.6
    ],
    [
     "3501 GEMMA M0",
     28,
     27.9,
     6.4
    ],
    [
     "5302 KB2040",
     34.2,
     17.8,
     4.8
    ],
    [
     "4870 Neo Trinkey",
     31.7,
     12.1,
     3.9
    ],
    [
     "4964 Rotary Trinkey",
     32.4,
     30.4,
     16.5
    ],
    [
     "5020 NeoKey Trinkey",
     31.6,
     19.2,
     16.5
    ],
    [
     "5056 Trinkey QT2040",
     38.1,
     19.7,
     5.5
    ],
    [
     "5953 Pixel Trinkey",
     40.2,
     15.2,
     12
    ]
   ]
  }
 },
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 "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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 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "seeed-xiao",
  "adafruit-feather-boards",
  "pin-headers-2.54mm",
  "usb-c-receptacle"
 ],
 "faq": [
  {
   "q": "What are QT Py dimensions?",
   "a": "21.8 × 17.8 mm, about 5 mm tall with the USB-C and STEMMA QT connectors; no mounting holes, same outline as the Seeed XIAO."
  },
  {
   "q": "Does the QT Py fit XIAO cases?",
   "a": "The outline is the same 21 × 17.8 mm class and the castellated pins match; the STEMMA QT connector on the QT Py adds 1.5 mm at the back end, so check that side."
  },
  {
   "q": "What are ItsyBitsy dimensions?",
   "a": "36 × 18 mm, 2.54 mm headers down both long edges, no mounting holes."
  }
 ],
 "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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}