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Teensy 4.1 Development Board

(£29.95 UK, incl VAT)
Price in points: 4992 points
14 g
In stock

Teensy 4.1 features the fastest micocontroller and an expanded set of powerful peripherals in a 2.4 by 0.7 inch form factor.

Teensy 4.0 can be programmed using the Arduino IDE with Teensyduino add-on.


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 Pin Out Connections


To use the Ethernet port, a magjack and capacitor need to be connected.

This is currently available only as a DIY project using this DIY kit here.

Memory Expansion

Teensy 4.1 Memory ExpansionThe bottom side of Teensy 4.1 has locations to solder 2 memory chips.

The smaller location is meant for a PSRAM chip AP Memory APS6404L or IPUS IPS6404L, see here for more info. The larger location is intended for flash memory.

USB Host

Teensy 4.1's USB Host port allow you to connect USB devices, like keyboards and MIDI musical instruments. A 5 pin header and a USB Host cable are needed to be able to plug in a USB device.



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