The Teensy 4.1 is a larger, more capable version of the Teensy 4.0, featuring the same 600MHz ARM Cortex-M7 processor with expanded I/O, built-in SD card socket, USB host port, and locations for optional memory expansion. Same footprint as Teensy 3.6 (61 × 17.8mm). This version does not include Ethernet capability. Fully compatible with Arduino IDE through Teensyduino. Key Features 600MHz ARM Cortex-M7 – Dual-issue superscalar with branch prediction 8MB Flash / 1024KB RAM – Four times the flash of Teensy 4.0 Built-in SD Card Socket – SDIO 4-bit native interface USB Host Port – Connect USB devices directly Memory Expansion – Two locations for optional PSRAM/Flash chips Hardware FPU – Accelerates 32-bit float and 64-bit double Dynamic Clock Scaling – Change speed without timing issues Overclockable – Runs well beyond 600MHz Specifications Processor – NXP iMXRT1062 (ARM Cortex-M7) Clock Speed – 600MHz (overclockable) Flash Memory – 8MB (64KB reserved for recovery/EEPROM) RAM – 1024KB (512KB tightly coupled) I/O Pins – 55 total (42 breadboard-friendly) Analog Inputs – 18 PWM Outputs – 35 Serial Ports – 8 SPI – 3 (all with 16-word FIFO) CAN Bus – 3 (1 with CAN FD) I2S Digital Audio – 2 S/PDIF Digital Audio – 1 DMA Channels – 32 Dimensions – 61 × 17.8mm Additional Features Cryptographic acceleration and random number generator Real-time clock with battery backup Programmable FlexIO Pixel processing pipeline Power on/off management Note: This version does not include Ethernet. Headers not included – purchase separately and solder as needed. Resources Teensy Quick Start Teensyduino Software Help Page and FAQ
