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Main Features

  • Very small size
  • QCA AR9331, MIPS 24K, SoC @400 MHz
  • 64MB DDR2 memory,
  • 16MB SPI NOR Flash, bootable
  • Wifi IEEE 802.11 b/g/n, 150Mbps max.
  • Frequency Band 2.4-2.4835GHz ISM Band
  • Antenna U.FL connector for IPEX/RP SMA
  • 2 × LAN ports and 1 × WAN port, 100Mbps
  • 1 × USB 2.0 Host
  • 1 × High-speed UART for console
  • 1 × SPI for external use
  • 1 × JTAG interface
  • 21 × GPIO / LED support
  • Surface mountable 29 × 25 × 2mm
  • Power 300mA @3.3V typ.

SOM-9331 New



Quick Link: | Main Features | More Pictures | Overview | Software Specifications | Core Components | Interfaces (typical / max) | Power Requirements | Mechanical | Environmental Data | Standards | MTBF (Mean Time Between Failures) | Warranty | Ordering Information | Packaging |


  More Pictures

Click on the thumbnails to enlarge them …

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The SOM-9331 is a complete, small form factor and surface mountable System-On-Module (SOM) that is optimized for low-cost, low-power and highly integrated networking devices. The module supports a full spectrum of functionality on a 39×25×2mm PCB design, requiring only a 3.3V power supply. It features the AR9331 MIPS 24K SoC, which is accompanied by a 64MByte DDR2 memory and 16MB SPI NOR Flash as a boot device. The SoC provides a complete CPU infrastructure, with a variety of connectivity interfaces: besides WAN/LAN, USB, SPI and SPDIF interfaces, the SOM includes a fully functional Wifi core that complies with the IEEE 802.11 b/g/n with internal PA and LNA. Further, it supports IEEE 802.11 b/g at standard data rates and IEEE 802.11n operations up to 7.2Mbps and 150Mbps for for 20MHz and 40MHz channels, respectively. The module is compatible with Linux operating systems and can run OpenWrt.

The SoC has many interface options, which are multiplexed on the connection pins. As a result, this yields a lot of available function; however, not all of them can be utilised in the same configuration. The specifications below name the number of functions in a typical configuration, as well as the maximum number of usable ones in certain setups. OEM/ODM customers can get support in developing their own carrier board for the target application using proven interface designs.

  Software Specifications


BSP with Kernel and bootloader patches and basic configuration (Github)
Buildroot are suitable for installation to NOR Flash

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  Core Components


Atheros AR9331 MIPS 24Kc RISC CPU @400MHz


  • 64MB DDR2
  • 16MB SPI NOR Flash


from SPI NOR Flash


Watchdog Timer

WLAN Standards

IEEE 802.11b/g/n 2.4 GHz ISM Band

WLAN Modes

Access Point (AP) or Client (Station)

TX Power

Typ. 19.5dBm @ 1Mbps (CCK)
Typ. 20.0dBm @ 11Mbps (OFDM)
Typ. 19.5dBm @ 6Mbps (CCK)
Typ. 20.0dBm @ 54Mbps (OFDM)
Typ. 21dBm, HT=20MHz @ 7.2Mbps (OFDM)
Typ. 15dBm, HT=40MHz @ 150Mbps (OFDM)

RX Sensitivity

-93.0dBm @ 1Mbps, -87.0dBm @ 11Mbps
-88.0dBm @ 6Mbps, -74.0dBm @ 54 Mbps
-94dBm @ 7.2Mbps (20 MHz), -73.0dBm @ 72.2Mbps (20 MHz)
-89dBm @ 15Mbps (40 MHz), -69.0dBm @ 150Mbps (40 MHz)


U.FL antenna connector or side pad

Connection Pads

Surface mount with 52 side pads

  • 41 × signal pads
  • 7 × GND pads
  • 2 × 3.3V pads
  • 1 × 2.0V output for ext. ETH-Transformer
  • 1 × antenna pad

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  Interfaces (typical / max)

Fast Ethernet

3 / 3 × 10/100 Mbit PHY


1/ 1 × USB 2.0

Audio / Telephony

0 / 2 I²S
0 / 1 SPDIF out
0 / 1 SLIC


1 / 1 Port

Serial Ports UART

1 / 1 Port


1 / 1 JTAG


14 / 21 signals from MPU

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  Power Requirements

Input Voltage

3.3V @ 300mA

Aux. Power Output

2.0V @ 120mA max.

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39×25×2 mm³

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  Environmental Data

Operating Temp

-20°C - 75°C

Storage Temp

-20°C - 85°C

Ambient Humidity

10-85% non-condensing

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  • EMC: FCC Class A, CE Class A
  • Environment: RoHS

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  MTBF (Mean Time Between Failures)


117.5 Years @ 25°C


Telcordia (Bellcore) Standard; RelCalc. 5.0 BELL-7

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Warranty Period

2 years

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  Ordering Information



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Packing list

SOM-9331 System on Module

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* Specifications are subject to change without notice.
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