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

Resources

• Teensy Quick Start
• Teensyduino Software
• Help Page and FAQ