Teensy 4.1 with Ethernet chip features the fastest microcontroller and an expanded set of powerful peripherals in a 2.4″x0.7″ form factor and can be programmed using the Arduino IDE with Teensyduino add-on.
We also stock a version of this board without the Ethernet chip (a workaround for the pesky chip shortages!) which is slightly cheaper – handy if you have no use for the Ethernet functionality.
Free headers!
We now include free headers with all of our unsoldered Teensy boards! This board comes with two 36-way header strips for you to cut down and solder.
We also sell the Teensy 4.1 with pre-assembled headers (great for those who don’t enjoy soldering!)
Comparison 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) |
-none- |
| 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 |
Pinouts
Teensy 4.1 is designed to bring all general-purpose I/O pins to breadboard-friendly pads on the outside edges.
Ethernet
To use the Ethernet port, a magjack and capacitor need to be connected.
We have the PJRC Ethernet kit available here.
Memory Expansion
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.
The PSRAM chip is meant to be soldered to the smaller pads on the bottom side of Teensy 4.1, underneath the SD card socket, between pins 31-32 and 33-34. Do not use the larger pads. A single PSRAM chip must be soldered to the smaller pads to be detected.
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