SBC

Raspberry Pi 3 Model A+ specs, pinout & datasheets

Single-board computer · Raspberry Pi · Released November 2018

The Pi 3B+ processor and dual-band wireless on the small A+ board, with 512 MB of RAM and a single USB port.

Chip / SoC: Broadcom BCM2837B0
CPU: 4 × Cortex-A53 (ARMv8, 64-bit)
Clock: 1.4 GHz
RAM: 512 MB
Storage: microSD card
Wireless: 2.4/5 GHz 802.11ac Wi-Fi; Bluetooth 4.2 and BLE
I/O voltage: 3.3 V
Released: November 2018
Status: In production

Draft entry: these specs were compiled from the linked sources and are waiting for a second check. Spotted a mistake? Use the form at the end of the page.

Specifications

13 specs

Chip / SoC: Broadcom BCM2837B0^[2]
CPU: 4 × Cortex-A53 (ARMv8, 64-bit)^[3]
Clock: 1.4 GHz^[3]
RAM: 512 MB^[2]
Storage: microSD card^[2]
GPIO: 40-pin header^[2]
I/O voltage: 3.3 V^[4]
Input voltage: 5 V via micro-USB^[2]
Wireless: 2.4/5 GHz 802.11ac Wi-Fi; Bluetooth 4.2 and BLE^[2]
USB: 1 × USB 2.0^[2]
Video: HDMI; composite on the 3.5 mm AV jack; DSI display connector^[2]
Expansion: CSI camera connector^[2]
Launch price: US$25^[7]

Can I still use it?

1 platforms

Raspberry Pi OS: Supported^[8]32-bit and 64-bit images.

As published by each project, checked weekly. A platform not listed has no published information here, which is not the same as no support.

Datasheets and documents

2 documents

Raspberry Pi hardware documentationGuide
Raspberry Pi 3 Model A+ reduced schematicsSchematic

Pinout

40 pins

Raspberry Pi 40-pin GPIO header^[4]

Power
Ground
GPIO
Special
Not connected

Pin table (40 pins)

J8 (40-pin GPIO)
Pin	Label	Kind	Functions
1	3V3	Power
2	5V	Power
3	GPIO2	GPIO	I2C1 SDA
4	5V	Power
5	GPIO3	GPIO	I2C1 SCL
6	GND	Ground
7	GPIO4	GPIO	GPCLK0
8	GPIO14	GPIO	UART TXD
9	GND	Ground
10	GPIO15	GPIO	UART RXD
11	GPIO17	GPIO
12	GPIO18	GPIO	PCM CLK, PWM0
13	GPIO27	GPIO
14	GND	Ground
15	GPIO22	GPIO
16	GPIO23	GPIO
17	3V3	Power
18	GPIO24	GPIO
19	GPIO10	GPIO	SPI0 MOSI
20	GND	Ground
21	GPIO9	GPIO	SPI0 MISO
22	GPIO25	GPIO
23	GPIO11	GPIO	SPI0 SCLK
24	GPIO8	GPIO	SPI0 CE0
25	GND	Ground
26	GPIO7	GPIO	SPI0 CE1
27	ID_SD	Special	GPIO0, HAT EEPROM I2C SDA
28	ID_SC	Special	GPIO1, HAT EEPROM I2C SCL
29	GPIO5	GPIO
30	GND	Ground
31	GPIO6	GPIO
32	GPIO12	GPIO	PWM0
33	GPIO13	GPIO	PWM1
34	GND	Ground
35	GPIO19	GPIO	PCM FS, SPI1 MISO
36	GPIO16	GPIO	SPI1 CE2
37	GPIO26	GPIO
38	GPIO20	GPIO	PCM DIN, SPI1 MOSI
39	GND	Ground
40	GPIO21	GPIO	PCM DOUT, SPI1 SCLK

Gotchas

2 known issues

3.3 V only. The GPIO pins are 3.3 V. Do not connect 5 V signals or components to them.^[4]
Little current per pin. Each GPIO pin can supply up to about 16 mA and all pins together about 50 mA; drive motors and other loads through a transistor or driver board.^[5]

What changed

From the specs

Since the Raspberry Pi 1 Model A+

Spec	Raspberry Pi 1 Model A+	Raspberry Pi 3 Model A+
Chip / SoC	Broadcom BCM2835	Broadcom BCM2837B0
CPU	Arm1176JZF-S (ARMv6), single core	4 × Cortex-A53 (ARMv8, 64-bit)
Clock	700 MHz	1.4 GHz
RAM	256 MB; later boards 512 MB	512 MB
Wireless	—	2.4/5 GHz 802.11ac Wi-Fi; Bluetooth 4.2 and BLE
Launch price	US$20	US$25

Power and battery

3 facts

Recommended supply: 2.5 A^[5]
USB peripheral budget: Limited only by the supply, board and connector ratings^[5]
Typical bare-board draw: 350 mA^[5]

History and use today

Editorial

History

Released in November 2018, the 3A+ filled the gap for a small, cheap Pi with modern wireless between the Zero and the 3B+.^[7]

Still useful for

Good for embedded builds that need more CPU than a Zero 2 W and a full-size HDMI port, such as robots, camera rigs and media players.

Projects from the archive

1 build

Building 'Garbage': A Music NodeIssue 45

Sources

8 sources

Spotted a mistake?

Reviewed by hand

Every report is read by a person and checked against a source before anything changes. Please link one if you have it.

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