The Teensy 3.5 is a compact, powerful USB development board built around a 32-bit ARM Cortex-M4 processor running at 120 MHz with a hardware floating-point unit. With 512 KB of flash, 256 KB of RAM, and 64 digital I/O pins (all 5V tolerant), it packs serious capability into a small form factor.

Features include a built-in SD card slot with native 4-bit SDIO, dual DAC outputs, 27 analogue inputs, and extensive communication interfaces. All Teensy boards ship assembled and fully tested.

Key Features

• 120 MHz Cortex-M4 – With hardware floating-point and DSP extensions
• 512 KB Flash / 256 KB RAM – Ample space for complex projects
• 64 Digital I/O Pins – All 5V tolerant
• 27 Analogue Inputs – High channel count for sensor-heavy projects
• 2× DAC Outputs – Analogue audio and signal generation
• 20 PWM Outputs – For motors, LEDs, and servos
• Built-In SD Card Slot – Native 4-bit SDIO for fast data logging
• USB Device Interface – Configurable as serial, MIDI, audio, keyboard, joystick, and more
• 6 Serial / 3 SPI / 3 I²C – Plus CAN bus and I²S/TDM digital audio
• Real-Time Clock – With optional coin cell backup

Specifications

• Processor – ARM Cortex-M4 (MK64FX512)
• Clock Speed – 120 MHz
• Flash – 512 KB
• RAM – 256 KB
• EEPROM – 4 KB (emulated)
• DMA Channels – 16
• USB – 12 Mbps device
• Dimensions – 2.4 × 0.7 inches (61 × 18 mm)

Ideal For

• Audio and music synthesis projects
• Data logging with SD card
• USB MIDI controllers and HID devices
• Signal processing and sensor arrays

Package Contents

• 1× Teensy 3.5 (assembled and tested)

Resources

• PJRC Teensy 3.5 Product Page