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 4.1 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.
||10 / 100 Mbit
||5 Pins with
|2 SMT Pads
|SDIO (4 bit data)
||Micro SD Socket
||8 SMT Pads
Plus Program Memory
|Program memory only
|Breadboard Friendly I/O
|Bottom SMT Pad Signals
|SD Card Signals
|Total I/O Pins
Teensy 4.1 is designed to bring all general purpose I/O pins to breadboard friendly pads on the outside edges.
To use the Ethernet port, a magjack and capacitor need to be connected.
This is currently available only as a DIY project using this OSH Park Shared Circuit Board. PJRC is planning to offer this as a DIY kit in the near future. You can also make the connection by soldering wires.
These parts are recommended to build the Ethenet connection.
1 Ethernet Magjack RB1-125BAG1A, Mouser 950-RB1-125BAG1A, Digikey 1278-1011-ND
2 Header, 3x2, 2mm pitch Digikey 1849-1000-ND
2 Socket, 3x2, 2mm pitch Amphenol FCI 89361-706LF, Digikey 609-3139-ND
1 Ribbon Cable, 3 to 6 inch Digikey HF06S-5-ND
1 Capacitor, 0.1uF, 805
1 Capacitor, 1uF, 805 probably not needed
1 Capacitor, 1nF, 805 optional, should be high voltage rated if used
1 Resistor, 1M optional
1 Circuit Board OSH Park Shared PCB
Basic memory layout is documented on the Teensy 4.0 page.
The bottom side of Teensy 4.1 has locations to solder 2 memory chips.
The smaller location is meant for a PSRAM chip. The larger location is intended for flash memory.
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.
USB hubs may be used if more than 1 device is needed. See the USBHost_t36 examples for details.