PJRC Teensy 4.1 ARM Cortex-M7 Microcontroller + Ethernet Kit

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  • Regular price $38.50

Teensy 4.1 is the latest Teensy microcontroller development board from PJRC. It features an ARM Cortex-M7 IMXRT1062 processor at 600 MHz. The actual size is 2.4 by 0.7 inch, the same form-factor as Teensy 3.6.

This kit includes the Teensy 4.1 Microcontroller board with a Teensy 4.1 Ethernet Kit. This kit has all the parts needed to connect to the Ethernet port on the Teensy 4.1. It includes an Ethernet MagJack, bare circuit board, ribbon cable assembly, 2 header pins, and a capacitor. DIY soldering is required to assemble the kit (the Teensy 4.1 board is fully assembled and tested).

Teensy 4.1 uses the same processor as Teensy 4.0, but provides greater I/O capability, including an ethernet PHY, SD card socket, and USB host port. Teensy 4.1 also comes with 4X larger flash memory, and has 2 locations to optionally add more memory.

Technical Specifications compared to Teensy 4.0

Teensy 4.1 & 4.0 use the same IMXRT1062, so most technical specifications are the same.

Please refer to the Teensy 4.0 page for common specifications and features.

Feature Teensy 4.1 Teensy 4.0
Ethernet 10 / 100 Mbit
DP83825 PHY
(6 pins)
USB Host 5 Pins with
power management
2 SMT Pads
SDIO (4 bit data) Micro SD Socket 8 SMT Pads
PWM Pins 35 31
Analog Inputs 18 14
Serial Ports 8 7
Flash Memory 8 Mbyte 2 Mbyte
QSPI Memory 2 chips
Plus Program Memory
Program memory only
Breadboard Friendly I/O 42 24
Bottom SMT Pad Signals 7 16
SD Card Signals 6 0
Total I/O Pins 55 40



Teensy 4.1 is designed to bring all general purpose I/O pins to breadboard friendly pads on the outside edges.

Teensy 4.1 pinout and specification card

Note: The Teensy 4.1 does not include headers and, if needed in your application, will need to be purchased separately and soldered on yourself.


PJRC forum for Teensy Users

PJRC Teensy 4.1 Product Page

Teensyduino Add-on for Arduino IDE Download

Hackster.io's Teensy Section