The Teensy 4.1 is built around the NXP i.MX RT1062 ARM Cortex-M7, operating at 600 MHz and delivering up to 1000+ DMIPS. It features tightly coupled memory (TCM), high-speed buses, and advanced DMA support, enabling deterministic execution with extremely low interrupt latency.
Designed as a bare-metal MCU platform with no operating system overhead, the Teensy 4.1 is optimized for hard real-time applications, including digital signal processing, audio synthesis, motor control, robotics, and high-speed data acquisition, while retaining full Arduino IDE compatibility through the Teensyduino core.
Official pinout
| Feature | Count |
|---|---|
| Total I/O pins | 55 |
| Breadboard-friendly I/O | 42 |
| PWM capable pins | 35 |
| Analog input pins | 18 |
| UART interfaces | 8 |
| I2C buses | 3 |
| SPI buses | 3 |
| CAN buses | 3 (1 with CAN FD) |
| 3.3 V power pins | Multiple |
| Ground pins | Many |
| Ethernet PHY pins | External kit required |
Pin functions
| Pin | Signal | Function | Pin | Signal | Function |
|---|---|---|---|---|---|
| 0 | RX1 | UART1 RX | 1 | TX1 | UART1 TX |
| 2 | OUT2 | GPIO / PWM | 3 | LRCLK2 | GPIO / PWM |
| 4 | BCLK2 | GPIO / PWM | 5 | IN2 | GPIO / PWM |
| 6 | OUT1D | GPIO / PWM | 7 | RX2 | UART2 RX |
| 8 | TX2 | UART2 TX | 9 | OUT1C | GPIO / PWM |
| 10 | CS | SPI CS / PWM | 11 | MOSI | SPI MOSI |
| 12 | MISO | SPI MISO | 13 | SCK / LED | SPI SCK / Onboard LED |
| 14 | A0 | Analog In / PWM | 15 | A1 | Analog In / PWM |
| 16 | A2 | Analog In / PWM | 17 | A3 | Analog In / PWM |
| 18 | A4 / SDA | I2C SDA | 19 | A5 / SCL | I2C SCL |
| 20 | A6 | Analog In | 21 | A7 | Analog In |
| 22 | A8 | Analog In | 23 | A9 | Analog In |
| 24 | A10 | Analog In | 25 | A11 | Analog In |
| 26 | A12 | Analog In | 27 | A13 | Analog In |
| 28 | A14 | Analog In | 29 | A15 | Analog In |
| 30 | RX7 | UART7 RX | 31 | TX7 | UART7 TX |
| 32 | OUT1B | GPIO / PWM | 33 | MCLK2 | GPIO / PWM |
| 34 | RX8 | UART8 RX | 35 | TX8 | UART8 TX |
| 36 | CS2 | SPI CS | 37 | CS3 | SPI CS |
| 38 | A16 | Analog In | 39 | A17 | Analog In |
| 40 | RX6 | UART6 RX | 41 | TX6 | UART6 TX |
Specifications
The Teensy 4.1 prioritizes processing power and I/O over onboard peripherals to stay compact.
| Feature | Details |
|---|---|
| MCU | NXP i.MX RT1062 (ARM Cortex-M7 @ 600 MHz) |
| RAM | 1024 KB (512 KB tightly coupled) |
| Flash memory | ~8 MB (with EEPROM emulation) |
| GPIO | 55 total I/O pins (42 easily breadboard-accessible) |
| PWM pins | 35 |
| Analog inputs | 18 (12-bit ADC) |
| Communication interfaces | UART, SPI, I2C, CAN, USB (host + device) |
| Ethernet | 10/100 Mbit via DP83825 PHY |
| SD card | MicroSD card socket |
| Operating voltage / I/O logic | 3.3 V (not 5 V tolerant) |
| Power options | USB or external 5 V at VIN |
| Dimensions | ~2.4 × 0.7 inches |
Compatibility
- Arduino IDE compatible (via Teensyduino)
- 3.3V logic level
- Supports bare-metal real-time programming
- Ideal for high-speed and low-latency applications
- Breadboard-friendly (with headers)
- Cross-platform support (Windows, Linux, macOS)
- Ethernet capable
Helpful Resources
- Get started with Teensy 4.1(video tutorial):
- Benchmark test: Official documentation