{ "version": "2026-10-20", "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.", "slug": "adafruit-tca9548a-2717", "name": "Adafruit TCA9548A 1-to-8 I2C multiplexer (#2717): 17.78 × 30.48 mm board and 2 mounting holes", "kind": "modern", "category": "Electronic components", "group": "Modules, sensors & displays", "year": null, "question": "What are the Adafruit TCA9548A (product 2717) breakout dimensions and mounting-hole positions?", "tags": [ "tca9548a", "i2c multiplexer", "adafruit tca9548a dimensions", "tca9548a mounting holes", "i2c mux breakout" ], "aliases": [ "Adafruit TCA9548A", "Adafruit 2717", "TCA9548A I2C multiplexer", "TCA9548A 1-to-8 I2C Multiplexer Breakout", "I2C mux breakout", "TCA9548A breakout board" ], "overall_mm": { "length": 30.48, "width": 17.78, "height": 1.6 }, "official_cad": false, "xem_status": "free-files", "les": false, "free_files": 1, "url": "https://xemstudio.com/objects/adafruit-tca9548a-2717/", "sheet_txt": "https://xemstudio.com/objects/adafruit-tca9548a-2717/sheet.txt", "sheet": { "basis": "Adafruit's EagleCAD board file for the TCA9548A I2C multiplexer breakout, including its own dimension lines.", "overall_mm": { "length": 30.48, "width": 17.78, "height": 1.6 }, "notes": [ "Board 17.78 × 30.48 with square corners, centred, board bottom at 0. Board thickness 1.6 is assumed (Adafruit's board file does not state it); everything else is from the board file.", "Two plated Ø2.5 mounting holes on the long centre line at (0, ±12.70): 25.40 apart, 2.54 in from each short edge.", "No STEMMA QT connectors on this SKU (2717); Adafruit's STEMMA QT I2C mux is a different board (PCA9548, product 5626).", "Not modelled: the two loose 1×12 0.1 in headers along the long edges, the TSSOP-24 chip and passives.", "All dimensions are exact nominal millimetres, true size, with no tolerance added." ], "table": { "columns": [ "hole", "x (mm)", "y (mm)", "diameter (mm)" ], "rows": [ [ "1", "0", "-12.70", "2.5" ], [ "2", "0", "+12.70", "2.5" ] ] } }, "sheet_text": "Adafruit TCA9548A 1-to-8 I2C multiplexer (#2717): 17.78 × 30.48 mm board and 2 mounting holes — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/adafruit-tca9548a-2717/ (sheet CC BY 4.0)\nBasis: Adafruit's EagleCAD board file for the TCA9548A I2C multiplexer breakout, including its own dimension lines.\nCatalog version: 2026-10-20\n\nOverall (mm): length 30.48, width 17.78, height 1.6\n- Board 17.78 × 30.48 with square corners, centred, board bottom at 0. Board thickness 1.6 is assumed (Adafruit's board file does not state it); everything else is from the board file.\n- Two plated Ø2.5 mounting holes on the long centre line at (0, ±12.70): 25.40 apart, 2.54 in from each short edge.\n- No STEMMA QT connectors on this SKU (2717); Adafruit's STEMMA QT I2C mux is a different board (PCA9548, product 5626).\n- Not modelled: the two loose 1×12 0.1 in headers along the long edges, the TSSOP-24 chip and passives.\n- All dimensions are exact nominal millimetres, true size, with no tolerance added.\n\nhole x (mm) y (mm) diameter (mm)\n1 0 -12.70 2.5\n2 0 +12.70 2.5\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Adafruit: TCA9548A I2C Multiplexer (#2717) — web — Publisher's page; dimensions are facts — https://www.adafruit.com/product/2717\n- Adafruit: Adafruit-TCA9548A-I2C-Multiplexer-PCB repository — web — Publisher's page; dimensions are facts — https://github.com/adafruit/Adafruit-TCA9548A-I2C-Multiplexer-PCB\n- Adafruit Learning System: Adafruit TCA9548A 1-to-8 I2C Multiplexer Breakout guide — web — Publisher's page; dimensions are facts — https://learn.adafruit.com/adafruit-tca9548a-1-to-8-i2c-multiplexer-breakout\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/adafruit-tca9548a-2717/index.json\nAPI: https://xemstudio.com/api/geometry?object=adafruit-tca9548a-2717\n", "sources": [ { "publisher": "Adafruit", "title": "TCA9548A I2C Multiplexer (#2717)", "url": "https://www.adafruit.com/product/2717", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Adafruit", "title": "Adafruit-TCA9548A-I2C-Multiplexer-PCB repository", "url": "https://github.com/adafruit/Adafruit-TCA9548A-I2C-Multiplexer-PCB", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Adafruit Learning System", "title": "Adafruit TCA9548A 1-to-8 I2C Multiplexer Breakout guide", "url": "https://learn.adafruit.com/adafruit-tca9548a-1-to-8-i2c-multiplexer-breakout", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false } ], "xem": { "status": "free-files", "sheet_free": true, "mesh_price_usd": null, "step_price_usd": null, "tolerance_mm": null }, "related": [ "adafruit-stemma-qt-breakouts", "pin-headers-2.54mm", "threaded-standoffs-metric", "adafruit-ads1115-1085", "adafruit-pca9685-16-channel-pwm-servo-driver" ], "fits": [], "dimensions": "exact (nominal, no tolerance added)", "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/", "mating": [ { "feature": "Mounting holes", "exact": "2 × Ø2.5, 25.40 apart on the centre line", "mates": "M2.5 or #2-56 screws and standoffs", "fit": "designed", "files": "all" }, { "feature": "Header rows", "exact": "2 × 1×12 at 2.54 pitch along the long edges", "mates": "0.1 in female headers or breadboard", "fit": "designed", "files": "all" } ], "fit_classes": { "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.", "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. ISO 286 equivalent: H7/g6 or H7/h6.", "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).", "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.", "clamp": "split part that closes on the mating part with screws: make it at size.", "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change." }, "faq": [ { "q": "How big is the Adafruit TCA9548A breakout?", "a": "17.78 × 30.48 mm, 1.6 mm board (assumed)." }, { "q": "Where are its mounting holes?", "a": "Two Ø2.5 holes on the long centre line, 25.40 mm apart (2.54 mm from each short edge)." }, { "q": "Does it have STEMMA QT connectors?", "a": "No. Product 2717 has only 0.1 in header pads; the STEMMA QT mux is the PCA9548 board, product 5626." } ], "files_license": null, "offers": [ { "file": "adafruit-tca9548a-2717", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/adafruit-tca9548a-2717/adafruit-tca9548a-2717.step", "stl": "https://xemstudio.com/files/hardware/adafruit-tca9548a-2717/adafruit-tca9548a-2717.stl", "note": "Adafruit TCA9548A 1-to-8 I2C multiplexer (#2717): 17.78 × 30.48 mm board and 2 mounting holes" } ], "markdown": "https://xemstudio.com/objects/adafruit-tca9548a-2717/index.md" }