TinkerNewsWeekly · DIY electronicsEst. 2025
TinkerNews
SBC

Raspberry Pi 1 Model A+ specs, pinout & datasheets

Single-board computer · Raspberry Pi · Released November 2014

The small, low-power $20 Raspberry Pi of 2014: the B+ layout cut down to one USB port and no Ethernet, 65 mm long.

CPU
Arm1176JZF-S (ARMv6), single core
Clock
700 MHz
RAM
256 MB; later boards 512 MB
Storage
microSD card
I/O voltage
3.3 V
Released
November 2014

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

12 specs
Chip / SoC
Broadcom BCM2835[2]
CPU
Arm1176JZF-S (ARMv6), single core[3]
Clock
700 MHz[8]
RAM
256 MB; later boards 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]
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$20[7]

Can I still use it?

1 platforms
Raspberry Pi OS
Supported[9]32-bit image; the 64-bit image needs a 64-bit model such as the Pi 3 or later.

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

Pinout

40 pins
Raspberry Pi 40-pin GPIO header pinout diagramJ8 (40-pin GPIO)13V325V3GPIO245V5GPIO36GND7GPIO48GPIO149GND10GPIO1511GPIO1712GPIO1813GPIO2714GND15GPIO2216GPIO23173V318GPIO2419GPIO1020GND21GPIO922GPIO2523GPIO1124GPIO825GND26GPIO727ID_SD28ID_SC29GPIO530GND31GPIO632GPIO1233GPIO1334GND35GPIO1936GPIO1637GPIO2638GPIO2039GND40GPIO21
Raspberry Pi 40-pin GPIO header[4]
  • Power
  • Ground
  • GPIO
  • Special
  • Not connected
Pin table (40 pins)
J8 (40-pin GPIO)
PinLabelKindFunctions
13V3Power
25VPower
3GPIO2GPIOI2C1 SDA
45VPower
5GPIO3GPIOI2C1 SCL
6GNDGround
7GPIO4GPIOGPCLK0
8GPIO14GPIOUART TXD
9GNDGround
10GPIO15GPIOUART RXD
11GPIO17GPIO
12GPIO18GPIOPCM CLK, PWM0
13GPIO27GPIO
14GNDGround
15GPIO22GPIO
16GPIO23GPIO
173V3Power
18GPIO24GPIO
19GPIO10GPIOSPI0 MOSI
20GNDGround
21GPIO9GPIOSPI0 MISO
22GPIO25GPIO
23GPIO11GPIOSPI0 SCLK
24GPIO8GPIOSPI0 CE0
25GNDGround
26GPIO7GPIOSPI0 CE1
27ID_SDSpecialGPIO0, HAT EEPROM I2C SDA
28ID_SCSpecialGPIO1, HAT EEPROM I2C SCL
29GPIO5GPIO
30GNDGround
31GPIO6GPIO
32GPIO12GPIOPWM0
33GPIO13GPIOPWM1
34GNDGround
35GPIO19GPIOPCM FS, SPI1 MISO
36GPIO16GPIOSPI1 CE2
37GPIO26GPIO
38GPIO20GPIOPCM DIN, SPI1 MOSI
39GNDGround
40GPIO21GPIOPCM 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

SpecRaspberry Pi 1 Model ARaspberry Pi 1 Model A+
RAM256 MB256 MB; later boards 512 MB
StorageFull-size SD cardmicroSD card
GPIO26-pin header (P1)40-pin header
VideoHDMI and RCA composite; DSI display connectorHDMI; composite on the 3.5 mm AV jack; DSI display connector
Launch priceUS$25US$20

Next came the Raspberry Pi 3 Model A+

SpecRaspberry Pi 1 Model A+Raspberry Pi 3 Model A+
Chip / SoCBroadcom BCM2835Broadcom BCM2837B0
CPUArm1176JZF-S (ARMv6), single core4 × Cortex-A53 (ARMv8, 64-bit)
Clock700 MHz1.4 GHz
RAM256 MB; later boards 512 MB512 MB
Wireless—2.4/5 GHz 802.11ac Wi-Fi; Bluetooth 4.2 and BLE
Launch priceUS$20US$25

Power and battery

3 facts
Recommended supply
700 mA[5]
USB peripheral budget
500 mA[5]
Typical bare-board draw
180 mA[5]

History and use today

Editorial

History

The A+ arrived in November 2014 as the Model A rebuilt on the B+ layout: shorter, lighter and the lowest-power full-size Pi of its generation.[7]

Still useful for

At about 180 mA idle it remains a sensible choice for battery or solar projects that need the 40-pin header but not networking; the 3 Model A+ is the faster equivalent with wireless.

Sources

9 sources
  1. Raspberry Pi hardware, Raspberry Pi documentation
  2. Raspberry Pi hardware introduction (documentation source)
  3. Processors, Raspberry Pi documentation
  4. GPIO and the 40-pin header, Raspberry Pi documentation (source)
  5. Power supplies, Raspberry Pi documentation (source)
  6. Raspberry Pi OS, Raspberry Pi documentation
  7. Raspberry Pi Model A+ on sale now at $20, Raspberry Pi news
  8. Raspberry Pi, Wikipedia
  9. Raspberry Pi OS downloads, Raspberry Pi

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.

Report a mistake