Where our footprints come from.

The footprint library in 3V3 is built from other people’s work. Every source is listed here, with its licence, whom to credit, and the exact version we loaded.

In short

Using a footprint in your board does not make your board open. No library below asks you to publish your board. KiCad, Digi-Key and Espressif say so in an exception for designs: the boards, Gerber files and other files you make with them are yours, under any licence you like. The others (MIT, Apache, CC BY, CERN-OHL-P) have no share-alike clause at all.
Würth Elektronik’s footprints are not under an open licence. They stay Würth’s property and Würth’s own terms (linked in its block below) apply to anyone who takes them from here; every one is marked as a converted copy and credits Würth as the source.
Copying the footprint library itself is different. If you take the footprints, or part of them, out of 3v3.dev and share them on as a collection, they stay under the licence they came with: the same licence, the credit, and the licence documents. For the CC BY-SA libraries that means the same licence; for the others, keeping their notice and the credit below. 3v3.dev keeps these footprints apart from its own built-in parts, labelled with their source, licence and credit on every one, and does not relicense them: the CC BY-SA libraries are, as a collection, still CC BY-SA 4.0 with their exception for designs.
This page covers the footprints we took from other libraries. The software and the site of 3v3.dev are not part of any of them and are not offered under their licences.

The sources

KiCad official footprint library

Where it is: https://gitlab.com/kicad/libraries/kicad-footprints
Version: commit 51f8a59e of 2026-10-04 (“Add TE M.2 connectors”). Pinned: the same commit every time we load it.
How much: 15,464 footprints in 155 libraries, 390,859 pads. 15,461 are in the store; 3 are left out because they have no pads and nothing 3V3 can read yet to draw (logos and symbols drawn on copper layers).
Licence: Creative Commons Attribution-ShareAlike 4.0 (CC BY-SA 4.0), with the KiCad Libraries exception for designs. The licence text that came with the library: LICENSE.md at that commit. KiCad’s own explanation: http://kicad.org/libraries/license.
Credit: The KiCad library contributors (the KiCad EDA project).
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

The exception to the licence, word for word from the library’s own LICENSE.md:

“To the extent that the creation of electronic designs that use 'Licensed Material' can be considered to be 'Adapted Material', then the copyright holder waives article 3 of the license with respect to these designs and any generated files which use data provided as part of the 'Licensed Material'.”

SparkFun KiCad Libraries

Where it is: https://github.com/sparkfun/SparkFun-KiCad-Libraries
Version: commit 25af7faf of 2026-10-09 (“Merge pull request #294 from sparkfun/pcUpdates”). Pinned: the same commit every time we load it.
How much: 624 footprints in 21 libraries, 7,870 pads. 617 are in the store; 7 are left out because they have no pads and nothing 3V3 can read yet to draw (logos and symbols drawn on copper layers).
Licence: Creative Commons Attribution 4.0 (CC BY 4.0), as stated in the library's README. The licence text that came with the library: README.md at that commit.
Credit: SparkFun Electronics.
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

ai03 MX_Alps_Hybrid (keyboard switches)

Where it is: https://github.com/ai03-2725/MX_Alps_Hybrid
Version: commit cdbfc72a of 2024-03-06 (“Update README.md”). Pinned: the same commit every time we load it.
How much: 289 footprints in 4 libraries, 2,782 pads.
Licence: MIT. The licence text that came with the library: LICENSE at that commit.
Credit: ai03 (Copyright (c) 2017 ai03).
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

ai03 MX_V2 (keyboard switches)

Where it is: https://github.com/ai03-2725/MX_V2
Version: commit 0b379eeb of 2024-08-15 (“Update readme to notify about hotswap footprint updates”). Pinned: the same commit every time we load it.
How much: 182 footprints in 11 libraries, 1,298 pads.
Licence: MIT. The licence text that came with the library: LICENSE at that commit.
Credit: ai03 (Copyright (c) 2017 ai03).
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

gekkio-kicad-libs

Where it is: https://github.com/Gekkio/gekkio-kicad-libs
Version: commit 043cfae6 of 2026-07-08 (“Add PTS540 3D model, adjust footprint”). Pinned: the same commit every time we load it.
How much: 142 footprints in 26 libraries, 7,328 pads.
Licence: Creative Commons Attribution 4.0 (CC BY 4.0). The licence text that came with the library: LICENSE at that commit.
Credit: Gekkio.
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

nordic-lib-kicad (community library for Nordic nRF parts, not made by Nordic Semiconductor)

Where it is: https://github.com/hlord2000/nordic-lib-kicad
Version: commit 05a4dae2 of 2026-09-14 (“Merge pull request #35 from 21km43/main”). Pinned: the same commit every time we load it.
How much: 29 footprints in 9 libraries, 1,878 pads.
Licence: CERN Open Hardware Licence Version 2 - Permissive (CERN-OHL-P-2.0). The licence text that came with the library: LICENSE at that commit.
Credit: hlord2000 and contributors.
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

ki-lime-pi-pico (community library for the Raspberry Pi Pico, not made by Raspberry Pi)

Where it is: https://github.com/recursivenomad/ki-lime-pi-pico
Version: commit 042623e2 of 2024-10-26 (“Move TPs on Pico W model to accurately reflect HW”). Pinned: the same commit every time we load it.
How much: 26 footprints in 2 libraries, 1,639 pads. 24 are in the store; 2 are left out because they have no pads and nothing 3V3 can read yet to draw (logos and symbols drawn on copper layers).
Licence: MIT-0 (taken under MIT-0; the library offers MIT-0 or CC0-1.0). The licence text that came with the library: LICENSE.txt at that commit.
Credit: Peter S. Hollander.
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

teensy.pretty (Teensy boards)

Where it is: https://github.com/XenGi/teensy.pretty
Version: commit 126e054a of 2024-04-20 (“Update README.md”). Pinned: the same commit every time we load it.
How much: 12 footprints in 1 libraries, 608 pads.
Licence: MIT. The licence text that came with the library: LICENSE at that commit.
Credit: Ricardo Band (Copyright (c) 2015).
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

Paw-Connect (Tag-Connect TC2030 alternative)

Where it is: https://github.com/LeoDJ/Paw-Connect
Version: commit fdf0e45b of 2024-10-28 (“Update README.md”). Pinned: the same commit every time we load it.
How much: 5 footprints in 1 libraries, 29 pads.
Licence: Creative Commons Attribution 4.0 (CC BY 4.0). The licence text that came with the library: LICENSE at that commit.
Credit: LeoDJ.
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

wemos-d1-mini-kicad

Where it is: https://github.com/rubienr/wemos-d1-mini-kicad
Version: commit df4790b8 of 2020-05-22 (“fix of issue #2: turned pinout in symbol and modules 180°”). Pinned: the same commit every time we load it.
How much: 4 footprints in 1 libraries, 64 pads.
Licence: Apache License 2.0. The licence text that came with the library: LICENSE at that commit.
Credit: rubienr.
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

Digi-Key KiCad Library (footprints)

Where it is: https://github.com/Digi-Key/digikey-kicad-library
Version: commit d4bd68f4 of 2022-02-02 (“Added Library Status Advisory”). Pinned: the same commit every time we load it.
How much: 464 footprints in 1 libraries, 6,912 pads.
Licence: Creative Commons Attribution-ShareAlike 4.0 (CC BY-SA 4.0), with an exception for designs. The licence text that came with the library: LICENSE.md at that commit.
Credit: Digi-Key Corporation. The library says it is unmaintained. Redistributing it as a collection keeps this licence (CC BY-SA 4.0), the credit and the licence documents.
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

The exception to the licence, word for word from the library’s own LICENSE.md:

Espressif KiCad libraries (footprints)

Where it is: https://github.com/espressif/kicad-libraries
Version: commit dd765618 of 2026-07-28 (“Kicad supported version updated on README (#230)”). Pinned: the same commit every time we load it.
How much: 54 footprints in 1 libraries, 2,734 pads.
Licence: Creative Commons Attribution-ShareAlike 4.0 (CC BY-SA 4.0), with an exception for designs. The licence text that came with the library: LICENSE.md at that commit.
Credit: Espressif Systems.
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

The exception to the licence, word for word from the library’s own LICENSE.md:

KiSwitch (keyboard switches)

Where it is: https://github.com/kiswitch/kiswitch
Version: commit aefcf650 of 2024-11-28 (“Update metadata.json GitHub Link”). Pinned: the same commit every time we load it.
How much: 510 footprints in 6 libraries, 3,120 pads.
Licence: MIT (the library is dual licensed MIT or CC BY-SA 4.0 with an exception; taken under MIT). The licence text that came with the library: LICENSE-MIT at that commit.
What we changed: Each footprint was converted from KiCad’s .kicad_mod text into 3V3’s own footprint format, with every dimension kept to a nanometre. Where 3V3 cannot draw something yet it is left out or approximated, and the footprint says so when you place it: lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, and a slotted hole becomes a round one the narrow way. Each footprint keeps its KiCad name, as Library:Name (for example Resistor_SMD:R_0805_2012Metric).

Würth Elektronik KiCad library (footprints)

Where it is: https://github.com/WurthElektronik/KiCad-Library
Version: commit 1fe8f831 of 2026-10-09 (“update library”). Pinned: the same commit every time we load it.
In the store: Not yet. The library is converted and checked; loading it into the store follows.
How much: 7,565 footprints in 43 libraries, 73,796 pads.
Licence: Würth Elektronik eiSos “License Terms” for its KiCad library (the vendor's own terms, not an open-source licence). The licence text that came with the library: License_Terms_WE_KiCad_library.pdf at that commit. Also with it: Disclaimer_WE_KiCad_library.pdf.
Credit: Würth Elektronik eiSos GmbH & Co. KG. Footprints only: the repository's 3D models and symbols are not loaded. Questions about the library itself go to Würth: libraries@we-online.com.
What we changed: Each footprint was converted from KiCad's .kicad_mod text into 3V3's own footprint format. We changed no dimension and moved or renamed nothing, but 3V3 cannot draw everything yet (lettering on the silkscreen is left out, a pad with a custom shape becomes the rectangle that just covers it, a slotted hole becomes a round one the narrow way), so a footprint is a converted copy and not Würth's original file, and every one is marked that way: originally provided by Würth Elektronik eiSos, converted by 3v3.dev. Each keeps its Würth name, as Library:Name (for example Inductor_SMD_Wurth:...). Würth's disclaimer travels with the data.

Their terms are not an open-source licence. The parts that matter here, word for word from License_Terms_WE_KiCad_library.pdf:

“WE eiSos hereby grants you a limited, non-exclusive, non-transferable, non- sublicensable, royalty-free license to use the Models under the conditions set forth in these license terms.”

“You shall be allowed to create designs with the Models and share those designs. You shall be allowed to modify the Models. You shall be allowed to share the modified Models.”

“You must attribute WE eiSos as the provider of the original Model. You must clearly mark all modified Models in such a way that it is immediately clear to any third party that it is a modified Model, which was originally provided by WE eiSos in its original form.”

“The Models created and provided by WE eiSos are and will remain the exclusive property of WE eiSos.”

Our reading, which is not legal advice: you may use these footprints in your designs and share those designs; a copy that has been changed has to say so and name Würth as the source, so every Würth footprint here is marked as a converted copy of Würth’s original; and the footprints stay Würth’s, so we do not relicense them.

Sources on this page: KiCad official footprint library, SparkFun KiCad Libraries, ai03 MX_Alps_Hybrid (keyboard switches), ai03 MX_V2 (keyboard switches), gekkio-kicad-libs, nordic-lib-kicad (community library for Nordic nRF parts, not made by Nordic Semiconductor), ki-lime-pi-pico (community library for the Raspberry Pi Pico, not made by Raspberry Pi), teensy.pretty (Teensy boards), Paw-Connect (Tag-Connect TC2030 alternative), wemos-d1-mini-kicad, Digi-Key KiCad Library (footprints), Espressif KiCad libraries (footprints), KiSwitch (keyboard switches), Würth Elektronik KiCad library (footprints). Each is listed with the version we use and whether its footprints are in the store yet.