Teensy 4.1 Development Board

  1. ARM Cortex-M7 at 600MHz
  2. 1024K RAM (512K is tightly coupled)
  3. 8 Mbyte Flash (64K reserved for recovery & EEPROM emulation)
  4. USB Host Port
  5. 2 chips Plus Program Memory
  6. 55 Total I/O Pins


The Teensy 4.1 is the newest iteration of the astoundingly popular development platform that features an ARM Cortex-M7 processor at 600MHz, with an NXP iMXRT1062 chip, four times larger flash memory than the 4.0, and two new locations to optionally add more memory. The Teensy 4.1 is the same size and shape as the Teensy 3.6 (2.4in by 0.7in) and provides greater I/O capability, including an ethernet PHY, SD card socket, and USB host port.

When running at 600 MHz, the Teensy 4.1 consumes approximately 100mA current and provides support for dynamic clock scaling. Unlike traditional microcontrollers, where changing the clock speed causes wrong baud rates and other issues, Teensy 4.1 hardware and Teensyduino’s software support for Arduino timing functions are designed to allow dynamically speed changes. Serial baud rates, audio streaming sample rates, and Arduino functions like delay() and millis(), and Teensyduino’s extensions like IntervalTimer and elapsedMillis, continue to work properly while the CPU changes speed. Teensy 4.1 also provides a power shut off feature. By connecting a pushbutton to the On/Off pin, the 3.3V power supply can be completely disabled by holding the button for five seconds and turned back on by a brief button press. If a coin cell is connected to VBAT, Teensy 4.1’s RTC also continues to keep track of date & time while the power is off. Teensy 4.1 also can also be overclocked, well beyond 600MHz!

Teensy 4.1’s Cortex-M7 processor includes a floating-point unit (FPU) that supports both 64 bit “double” and 32-bit “float”. With M4’s FPU on Teensy 3.5 & 3.6, and also Atmel SAMD51 chips, only 32-bit float is hardware accelerated. Any use of double, double functions like log(), sin(), cos() means slow software implemented math. Teensy 4.1 executes all of these with FPU hardware.

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Pin diagram

Teensy 4.1 Development Board


  1. 10 / 100 Mbit DP83825 PHY (6 pins)
  2. ARM Cortex-M7 at 600MHz
  3. 1024K RAM (512K is tightly coupled)
  4.  CAN Bus (1 with CAN FD)
  5. 2 I2S Digital Audio
  6. 1 S/PDIF Digital Audio
  7. 3 SPI, all with 16 word FIFO
  8. 7 Bottom SMT Pad Signals
  9. 8 Serial ports
  10. 32 general-purpose DMA channels
  11. Cryptographic Acceleration
  12. Random Number Generator
  13. RTC for date/time
  14. Programmable FlexIO
  15. Pixel Processing Pipeline
  16. Peripheral cross triggering
  17. microSD Card Socket
  18. Power On/Off management


Processor ARM
Core Cortex-M7
Ethernet 10 / 100 Mbit DP83825 PHY (6 pins)
USB Host 5 Pins with power management
SDIO (4 bit data) Micro SD Socket
PWM Pins 35
Analog Inputs 18
Serial Ports 8
Flash Memory 8 Mbyte
QSPI Memory 2 chips Plus Program Memory
Breadboard Friendly I/O 42
Bottom SMT Pad Signals 7
SD Card Signals 6
Total I/O Pins 55
Lenght(mm) 60.96
Width(mm) 17.78

Related Article:

Teensy 4.1 Is the First Arduino-Compatible Board

Package includes:

1 x Teensy 4.1 Development Board


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