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Flagship Teensy Board for High-Speed I/O, Ethernet, SD, and Memory Expansion
The Teensy 4.1 Development Board is the larger and more expandable sibling of Teensy 4.0. It keeps the same 600 MHz Cortex-M7 core while adding more pins, more storage features, Ethernet hardware support, and extra room for memory expansion.
It is a strong choice for advanced embedded systems, gateways, industrial-style controllers, high-end audio builds, large LED and display projects, and prototypes that need more I/O headroom.
Important: Teensy 4.1 is a 3.3V-only board. Its digital pins are not 5V tolerant, so use level shifting if your project has 5V signals.
Why you'll love it
- Same fast 600 MHz core as Teensy 4.0: Excellent for heavy real-time processing
- More I/O than Teensy 4.0: Better for wide interfaces and larger systems
- Built for expansion: Adds SD, Ethernet support, and extra memory options
- Strong for advanced embedded work: A great fit for serious prototypes and end-use controllers
- Best all-around choice in this group: Combines speed, memory, and connectivity
Comparison table
| Product | Best for | Core / Speed | Main edge |
|---|---|---|---|
| Teensy 3.6 without headers | Bigger legacy builds, audio, USB host | 32-bit Cortex-M4 / 180 MHz | Legacy high-end 3.x board with USB host |
| Teensy 4.0 | Fast DSP, displays, robotics, compact high-speed work | 32-bit Cortex-M7 / 600 MHz | Very high speed in a tiny footprint |
| Teensy 4.1 Development Board | Large systems, Ethernet, SD, memory expansion | 32-bit Cortex-M7 / 600 MHz | Most I/O, SD, Ethernet, memory expansion |
| Teensy 3.5 without headers | More I/O with easier 5V digital interfacing | 32-bit Cortex-M4 / 120 MHz | More I/O and 5V-tolerant digital inputs |
What you can build
Use it for Ethernet-connected controllers, complex synth or audio systems, large robotics, SD-heavy loggers, USB host tools, display engines, and advanced sensor hubs with lots of I/O.
Starter bundles
Popular pairings include the Teensy 4 Audio Shield, Ethernet parts, USB host accessories, storage, and memory expansion parts depending on your design.
Recommended add-ons
Recommended add-ons include audio hardware, Ethernet kits, USB host cables, PSRAM or supported memory parts, displays, and sensors that need many serial or digital lines.
Technical specifications
| Product | Teensy 4.1 Development Board |
|---|---|
| Main MCU | ARM Cortex-M7 |
| Clock Speed | 600 MHz |
| Memory | 7936 KB Flash, 1024 KB RAM, 4 KB EEPROM emulated |
| USB | USB device 480 Mbit/sec and USB host 480 Mbit/sec |
| I/O Pins | 55 digital I/O, 35 PWM |
| Analog | 18 analog inputs |
| Communication | 8 Serial, 3 SPI, 3 I2C, 3 CAN |
| Storage and Expansion | Native SD card, QSPI memory expansion, Ethernet support |
| Logic Notes | Accepts 0 to 3.3V signals only; not 5V tolerant |
Pinout & power notes
Teensy 4.1 brings many more edge-accessible signals than 4.0 and adds strong expansion options, but it remains a 3.3V logic platform. Plan level shifting if you need to talk to 5V devices.
Official resources
Official technical specs · Pinout reference · Schematic reference · Teensyduino setup
What’s in the box
1 × Teensy 4.1 Development Board
Frequently Asked Questions
Why choose 4.1 over 4.0? Choose 4.1 when you need more pins, Ethernet support, SD features, or memory expansion.
Is it still as fast as 4.0? Yes. Both use the same 600 MHz Cortex-M7 core.
Can I use 5V sensors directly? Only with proper level shifting, because the digital pins are not 5V tolerant.
Is this the best Teensy for larger systems? Yes. It is usually the strongest all-around option in the Teensy range.
Manila stock. Order before 16:00 PHT, ships today via J&T or LBC. Provincial: 1–3 working days.
Schools / class POs: we accept Purchase Orders for accredited schools and universities. contact us with your PO details.
Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
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