Teensy 4.0 ARM Cortex-M7 Microcontroller Development Board (Standard & Lockable Versions)

📋 Overview

The Teensy 4.0 is a compact, high-performance microcontroller development board from PJRC, built around a 600 MHz ARM Cortex-M7 processor with 2MB of flash memory and 1MB of RAM. It delivers processing power that rivals many microcomputers — all packed into the same tiny, breadboard-friendly footprint as the popular Teensy 3.2, measuring just 1.4 × 0.7 inches.

With 40 I/O pins, hardware floating point for both 32-bit and 64-bit math, 7 serial ports, 3 SPI, 3 I2C, 3 CAN Bus, and versatile USB device emulation, the Teensy 4.0 is ideal for projects that demand serious performance in the smallest possible package — all while remaining fully compatible with the Arduino IDE.

💡 Teensy 4.0 vs. Teensy 4.1: Both boards share the same 600 MHz processor and 1MB of RAM. The Teensy 4.1 is larger (2.4 × 0.7 in), has 4× more flash (8MB), and adds built-in Ethernet, a microSD card socket, USB host with power management, and more I/O pins. Choose the Teensy 4.0 when you need maximum performance in the smallest footprint, or as a drop-in upgrade from a Teensy 3.2.

🏪 Why Buy from Envistia Mall?

As an authorized PJRC/SparkFun reseller, our pricing is always competitive with other suppliers — and often better than distributors who mark these boards up at a premium.

• Competitive Pricing — No inflated markups. We price Teensy products competitively with the manufacturer's suggested retail price..
• User Guides & Documentation — Most products we sell include our own plain-English user guides with wiring diagrams and getting-started instructions, so you can get up and running quickly.
• Curated Accessories — We stock the compatible accessories you'll actually need — header pins, USB cables, and more — all in one place.
• Responsive Customer Support — We're here to help with orders, shipping, and general product questions. For in-depth technical questions, we'll connect you with the right resources.
• Fast US Shipping — We ship from the United States with quick handling times.
• Hassle-Free Returns — Simple, no-hassle return policy if something isn't right.

⭐ Key Features & Benefits

• 600 MHz ARM Cortex-M7 Processor — One of the fastest microcontrollers available. The dual-issue superscalar architecture can execute two instructions per clock cycle, delivering performance many times faster than typical 32-bit microcontrollers.
• 2MB Flash + 1MB RAM — Plenty of room for complex programs, with 512K of tightly coupled RAM for single-cycle access at full processor speed.
• Compact Teensy 3.2 Footprint — Same size and breadboard-friendly layout as the Teensy 3.2 (1.4 × 0.7 inches), making it a powerful drop-in upgrade for existing projects.
• Hardware Floating Point Unit (32 & 64-bit) — Full hardware acceleration for both single and double precision math. Functions like sin(), cos(), and log() execute at hardware speed — not through slow software emulation.
• 40 Digital I/O Pins (24 Breadboard-Friendly) — Extensive I/O capability including 31 PWM outputs, 14 analog inputs, 7 serial ports, 3 SPI, 3 I2C, and 3 CAN Bus ports.
• USB Device (480 Mbit/s) + USB Host — The main USB port supports Serial, Keyboard, Mouse, MIDI, Joystick, Audio, and more. A secondary USB host port (via bottom SMT pads) lets you connect USB devices directly to the Teensy.
• Versatile USB Device Emulation — Appear as a keyboard, mouse, MIDI controller, joystick, audio device, flight sim controller, or multiple device types simultaneously.
• 32 DMA Channels — Hardware-accelerated data transfer for audio, LEDs, displays, and communication peripherals.
• Real-Time Clock (RTC) — Built-in RTC with dedicated 32.768 kHz crystal. Add a CR2032 coin cell to maintain date/time while powered off.
• Arduino IDE Compatible — Program with the familiar Arduino IDE using the Teensyduino add-on. Also supports PlatformIO, Visual Micro, CircuitPython, and command-line toolchains.
• Overclockable to 912 MHz — For projects that need even more speed, the Teensy 4.0 can be overclocked well beyond its rated 600 MHz.
• Cryptographic Acceleration & Random Number Generator — Built-in hardware security features.

🎯 Ideal Applications

• Multi-channel audio processing and synthesis (with the Teensy Audio Library and Audio Shield)
• Large-scale addressable LED installations (WS2812B/NeoPixel via OctoWS2811)
• Custom USB HID devices — keyboards, MIDI controllers, joysticks, flight sim panels
• CAN Bus automotive and industrial control projects
• Real-time signal processing and DSP
• Robotics and motor control (31 PWM channels)
• DMX lighting control
• Drop-in performance upgrade from Teensy 3.2
• Commercial and secure embedded products (Lockable variant available)

📊 Specifications

📦 What's in the Box

• 1× Teensy 4.0 Development Board (Standard or Lockable, depending on variant selected)
• 1× Pinout Reference Card

Note: Header pins and USB cable are sold separately.

🔧 Available Variants

The Lockable variant supports PJRC's Code Security features, including encrypted firmware updates, program memory protection, and JTAG disable — ideal for commercial products where intellectual property protection is critical.

💻 Software Compatibility

• Arduino IDE — Primary development environment with the Teensyduino boards add-on (installed via Boards Manager). Includes a large collection of optimized libraries.
• PlatformIO — Cross-platform IDE with advanced features. Supports Windows, Mac, and Linux.
• Visual Micro — Use Microsoft Visual Studio to program Teensy (Windows only, commercial software).
• CircuitPython — Python-based programming (partial hardware support).
• Command Line / Makefile — For non-graphical development workflows.

⚠️ Important Notes

• 3.3V Logic Only — All digital and analog pins operate at 3.3V. The pins are not 5V tolerant. Do not apply more than 3.3V to any pin.
• Header Pins Not Soldered — The board ships without header pins. Solder your own or purchase pre-soldered variants if available.
• USB Cable Required — A USB Micro-B cable is needed for programming and power (not included).
• USB Host Port — The USB host port is accessed via two small SMT pads on the bottom of the board (soldering required). Unlike the Teensy 4.1, there is no power management — do not hot-plug USB devices.
• SD Card Not Built In — SD card access is available via SPI (using a breakout board) or via bottom SMT pads (SDIO). For a built-in SD card socket, see the Teensy 4.1.

📄 Documentation & Resources

• User Guide:
• PJRC Official Product Page:
• PJRC Teensy Model Comparison:
• Teensyduino Software:
• Processor Reference Manual:
• All Teensy Products:

Sold and supported by . Ships from the USA. For wiring diagrams, sample code, and troubleshooting, see the User Guide. The manufacturer and Envistia LLC (dba Envistia Mall) are not responsible for any damages or losses resulting from the use of this product. Always follow proper electrical safety practices when working with electronic components. Specifications are based on manufacturer data and are subject to change without notice.