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Raspberry Pi 4 Model B: specs and pinout

Single-board computer with a 1.5GHz quad-core BCM2711 processor, 4GB LPDDR4 RAM, dual micro-HDMI and a 40-pin GPIO header.

Every value cites its sourceOfficial pinout

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Specs

Spec	Value	Source
Processor	Broadcom BCM2711, Quad-core Cortex-A72 (ARM v8) 64-bit @ 1.5GHz	Compoden listing
RAM	4GB LPDDR4-3200 SDRAM	Compoden listing
Wireless	Dual-band Wi-Fi 5 (802.11ac), Bluetooth 5.0	Compoden listing
Ethernet	Gigabit Ethernet	Compoden listing
GPIO	40-pin GPIO header (fully backward compatible)	source
Video	2x micro-HDMI ports (up to 4Kp60 supported)	Compoden listing
Power input	5V DC via USB-C connector (minimum 3A)	Compoden listing

Power

	Value	Source
Supply	5V DC via USB-C, minimum 3A	Compoden listing

Pinout

Pin	Function	Voltage	Source
pin 1: 3V3	3V3	3.3 V DC	source
pin 2: 5V	5V	5.0 V DC	source
pin 3: GP2	Serial Data Line (SDA); transmits data to and from an I2C device; this pin has a 1.8 kΩ on-board pull-up resistor to 3.3 V	3.3 V logic	source
pin 4: 5V	5V	5.0 V DC	source
pin 5: GP3	Serial Clock Line (SCL); provides a clock signal that synchronises communication between your Raspberry Pi and an I2C device; this pin has a 1.8 kΩ on-board pull-up resistor to 3.3 V	3.3 V logic	source
pin 6: GND	Ground		source
pin 7: GP4	GP4	3.3 V logic	source
pin 8: GP14	GP14	3.3 V logic	source
pin 9: GND	Ground		source
pin 10: GP15	GP15	3.3 V logic	source
pin 11: GP17	GP17	3.3 V logic	source
pin 12: GP18	GP18	3.3 V logic	source
pin 13: GP27	GP27	3.3 V logic	source
pin 14: GND	Ground		source
pin 15: GP22	GP22	3.3 V logic	source
pin 16: GP23	GP23	3.3 V logic	source
pin 17: 3V3	3V3	3.3 V DC	source
pin 18: GP24	GP24	3.3 V logic	source
pin 19: GP10	GP10	3.3 V logic	source
pin 20: GND	Ground		source
pin 21: GP9	GP9	3.3 V logic	source
pin 22: GP25	GP25	3.3 V logic	source
pin 23: GP11	GP11	3.3 V logic	source
pin 24: GP8	GP8	3.3 V logic	source
pin 25: GND	Ground		source
pin 26: GP7	GP7	3.3 V logic	source
pin 27: GP0	GP0	3.3 V logic	source
pin 28: GP1	GP1	3.3 V logic	source
pin 29: GP5	GP5	3.3 V logic	source
pin 30: GND	Ground		source
pin 31: GP6	GP6	3.3 V logic	source
pin 32: GP12	GP12	3.3 V logic	source
pin 33: GP13	GP13	3.3 V logic	source
pin 34: GND	Ground		source
pin 35: GP19	GP19	3.3 V logic	source
pin 36: GP16	GP16	3.3 V logic	source
pin 37: GP26	GP26	3.3 V logic	source
pin 38: GP20	GP20	3.3 V logic	source
pin 39: GND	Ground		source
pin 40: GP21	GP21	3.3 V logic	source

Common mistakes

Feeding 5V into GPIO pins: GPIO pins operate at 3.3 V and are not 5 V tolerant (source)
Back-powering the board through GPIO: avoid back-powering via GPIO to prevent damage (source)
Using an underpowered supply: use a stable 5V 3A USB-C supply (source)

What we could not confirm

40-pin header: pin names are the GPn names as printed on the official page; the alternate-function table is not covered (only GP2 and GP3 functions are given).
Specs come from the store listing; the official product specification page for this model is not covered.
Typical current draw: not stated in an official source.
Max current per GPIO pin: not stated in the official source.

Sources

Building with the Raspberry Pi 4 Model B? Describe your project on Soldr: it assigns pins from the board's published pinout, checks power and logic levels, and shows how to wire every part.