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Microcontroller
Teensy 4.0
Very fast compact Teensy with extensive peripheral muxing and Teensyduino Arduino tooling.
- GPIO
- I2C
- SPI
- UART
- ADC
- PWM
- CAN
- USB
- Processor
- i.MX RT1062 Cortex-M7 @ 600 MHz
- Logic
- 3.3 V GPIONot 5 V tolerant
- Power
- Micro-USB, VIN, 3.3 V rail
- Format
- Small DIP-style module
Before you wire
3 cautions- Teensy 4.x GPIO is 3.3 V only and not 5 V tolerant.
- Some pads are underside-only and harder to access.
- High-speed IO layouts need attention to grounding and signal integrity.
Pin map
Connector
Teensy 4.0 dual breadboard headers
USB at top, component side up, headers on both long edges
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
Pin
Hover, tap, or arrow to a pad to inspect it.
- Top-side breadboard pins (0-23) plus power, per the PJRC Teensy 4.0 pinout card; USB at the top.
- Teensy 4.x GPIO is 3.3 V and is NOT 5 V tolerant.
- Pins 14-23 double as analog inputs A0-A9; additional pads (A10-A13, second SD, etc.) are on the underside.
All 28 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | Ground | GND | ||
| 2 | UART | UART1 | RX1 / CRX2 | |
| 3 | UART | UART1 | TX1 / CTX2 | |
| 4 | PWM | |||
| 5 | PWM | |||
| 6 | PWM | |||
| 7 | PWM | |||
| 8 | PWM | |||
| 9 | UART | UART2 | RX2 | |
| 10 | UART | UART2 | TX2 | |
| 11 | PWM | |||
| 12 | SPI | SPI | CS | |
| 13 | SPI | SPI | MOSI | |
| 14 | SPI | SPI | MISO | |
| 28 | Power | VIN | 3.6-5.5 V input when USB is not used. | |
| 27 | Ground | GND | ||
| 26 | Power | 3V3 | Regulated 3.3 V output, 250 mA max. | |
| 25 | ADC | CAN1 | CRX1 | |
| 24 | ADC | CAN1 | CTX1 | |
| 23 | UART | UART5 | RX5 | |
| 22 | UART | UART5 | TX5 | |
| 21 | I2C | I2C | SCL | |
| 20 | I2C | I2C | SDA | |
| 19 | I2C | I2C1 | SDA1 / TX4 | |
| 18 | I2C | I2C1 | SCL1 / RX4 | |
| 17 | UART | UART3 | RX3 | |
| 16 | UART | UART3 | TX3 | |
| 15 | SPI | SPI | SCK / LED |
Source references
Why it matters
- Official PJRC page includes pinout card and peripheral tables.
- High clock speed makes it popular for audio, control, and signal projects.
- Small footprint suits dense embedded builds.
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