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# Compatible Microcontrollers
QMK runs on any USB-capable AVR or ARM microcontroller with enough flash space - generally 32kB or more, though it will *just* squeeze into 16kB with most features disabled.
## Atmel AVR
The following use [LUFA ](https://www.fourwalledcubicle.com/LUFA.php ) as the USB stack:
* [ATmega16U2 ](https://www.microchip.com/wwwproducts/en/ATmega16U2 ) / [ATmega32U2 ](https://www.microchip.com/wwwproducts/en/ATmega32U2 )
* [ATmega16U4 ](https://www.microchip.com/wwwproducts/en/ATmega16U4 ) / [ATmega32U4 ](https://www.microchip.com/wwwproducts/en/ATmega32U4 )
* [AT90USB64 ](https://www.microchip.com/wwwproducts/en/AT90USB646 ) / [AT90USB128 ](https://www.microchip.com/wwwproducts/en/AT90USB1286 )
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* [AT90USB162 ](https://www.microchip.com/wwwproducts/en/AT90USB162 )
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Certain MCUs which do not have native USB will use [V-USB ](https://www.obdev.at/products/vusb/index.html ) instead:
* [ATmega32A ](https://www.microchip.com/wwwproducts/en/ATmega32A )
* [ATmega328P ](https://www.microchip.com/wwwproducts/en/ATmega328P )
* [ATmega328 ](https://www.microchip.com/wwwproducts/en/ATmega328 )
## ARM
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You can also use any ARM chip with USB that [ChibiOS ](https://www.chibios.org ) supports. Most have plenty of flash. Known to work are:
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### STMicroelectronics (STM32)
* [STM32F0x2 ](https://www.st.com/en/microcontrollers-microprocessors/stm32f0x2.html )
* [STM32F103 ](https://www.st.com/en/microcontrollers-microprocessors/stm32f103.html )
* [STM32F303 ](https://www.st.com/en/microcontrollers-microprocessors/stm32f303.html )
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* [STM32F401 ](https://www.st.com/en/microcontrollers-microprocessors/stm32f401.html )
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* [STM32F407 ](https://www.st.com/en/microcontrollers-microprocessors/stm32f407-417.html )
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* [STM32F411 ](https://www.st.com/en/microcontrollers-microprocessors/stm32f411.html )
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* [STM32F446 ](https://www.st.com/en/microcontrollers-microprocessors/stm32f446.html )
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* [STM32G431 ](https://www.st.com/en/microcontrollers-microprocessors/stm32g4x1.html )
* [STM32G474 ](https://www.st.com/en/microcontrollers-microprocessors/stm32g4x4.html )
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* [STM32L412 ](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x2.html )
* [STM32L422 ](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x2.html )
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* [STM32L433 ](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x3.html )
* [STM32L443 ](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x3.html )
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### NXP (Kinetis)
* [MKL26Z64 ](https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/kl-series-cortex-m0-plus/kinetis-kl2x-72-96-mhz-usb-ultra-low-power-microcontrollers-mcus-based-on-arm-cortex-m0-plus-core:KL2x )
* [MK20DX128 ](https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/k-series-cortex-m4/k2x-usb/kinetis-k20-50-mhz-full-speed-usb-mixed-signal-integration-microcontrollers-based-on-arm-cortex-m4-core:K20_50 )
* [MK20DX256 ](https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/k-series-cortex-m4/k2x-usb/kinetis-k20-72-mhz-full-speed-usb-mixed-signal-integration-microcontrollers-mcus-based-on-arm-cortex-m4-core:K20_72 )
## Atmel ATSAM
There is limited support for one of Atmel's ATSAM microcontrollers, that being the [ATSAMD51J18A ](https://www.microchip.com/wwwproducts/en/ATSAMD51J18A ) used by the [Massdrop keyboards ](https://github.com/qmk/qmk_firmware/tree/master/keyboards/massdrop ).
