Loading source-backed pinouts…
Microcontroller
Teensy 4.0
A very fast compact Teensy board with extensive peripheral muxing and Arduino-compatible tooling through Teensyduino.
Processor
NXP i.MX RT1062 Arm Cortex-M7 @ 600 MHz
Logic
3.3 V GPIO
Power
Micro-USB, VIN, 3.3 V rail
Format
Small DIP-style module
Check before wiring
- 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.
Interfaces
GPIOI2CSPIUARTADCPWMCANUSB
Source-backed connector
Interactive pin map
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.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- 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 |
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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