Aitech A175

Expands Avionics Computer I/O Capabilities, MIL-STD-1553B Interface to Avionics Computer

Manufacturer: Aitech
Aitech A175

Aitech's A175 I/O Expansion Subsystem is a small add-on unit for avionics systems specially designed to:

  • Expand I/O capabilities of existing avionics systems
  • Support Avionics I/O having sensitive signals

With its high variety of I/O interfaces, small form factor, low power dissipation, and standard MIL-STD-1553B avionics bus interface (RT), the A175 handily meets these requirements. It can be used to expand the I/O capabilities of any avionics computer with a standard MIL-STD-1553B interface. For sensitive signals, the unit can be mounted in close proximity to sensors enabling short wiring to ensure maximum signal integrity and minimum signal loss.

The A175 is ideal for expanding the capabilities of existing avionics systems, with inherent scaling capability provided by additional units that can be added as slaves to the main avionics computer. The number that can be added is limited only by the capabilities of the main avionics computer. All I/O interfaces are implemented in the unit's FPGA, with only the physical layers being dedicated devices. This minimizes power consumption and enables convenient customization of the unit to meet specific applications.

To ensure the highest reliability, the A175 includes extensive Built-in-Test (BIT) capabilities. Each discrete output line is routed to a dedicated discrete input to enable loopback testing. (These dedicated discrete inputs are in addition to the discrete inputs available at the I/O connectors). The FPGA compares the input and output signals and writes a health status bit for each channel to registers in the FPGA that are accessible to the avionics computer CPU via the MIL-STD-1553B link.


CPU SpecN/A - not a processor module
NetworkTwo Gigabit Ethernet Ports
SerialTwo* asynchronous RS-232/422/485 UART serial ports
AudioStereo Audio (In or Out)
OtherEight single ended 12-bit A/D input channels
Two differential 16-bit D/A output channels
Four differential 16-bit D/A output channels with an external or internal reference voltage
Voltage reference source set of +10 and -10Vdc

Discrete Input Channels
• Twenty-four GND/OPEN discrete input channels
• Ten 28V/OPEN discrete input channels
• Five 28V/GND discrete input channels

Discrete Output Channels
• Five GND/OPEN discrete output channels
• Ten 28V/OPEN discrete output channels
• Five 28V/GND discrete output channels

• Eight ARINC-429 receivers
• Four ARINC-429 line drivers
• Supports bit and character-oriented data transfers
• Complies with AEEC adoptions of ARINC-429 specification
• All receivers can detect time-out between two consecutive ARINC-429 words
• High speed or low-speed configuration
• Receivers can accept data at any standard rate
• Parity support

Temperature Sensor
Elapsed Time Meter
• Records cumulative operating time
• Records on-off cycles



Electrical16 – 31.5Vdc input voltage range
10W Typical Power Consumption (<15w maximum)
Integral input power line filter
Mechanical180 x 180 x 33 mm (L x W x D)
SoftwareWindows 7
TemperatureOperating Temp: -40 to +71C
Storage Temp: -54 to +105C
Humidity5% to 95% relative humidity with condensation
Weight< 1.1kg
Altitude-1,500 to +60,000ft
? MIL-STD-810F, Method 514.5, Procedure I
Gunfire Vibration
? MIL-STD-810F, Method 514.5, Procedure IV
ShockMIL-STD-810F, Method 516.5, Procedure I
MTBF>9000 hours - ARW @ 50 °C (MIL-STD-217F)
EMCMIL-STD-461/462: RS02, RS03, CS01, CS02, CS06, RE02, CE01, CE03, CE07
Warranty1 Year


Ordering Details

BoardRefer to datasheet for ordering part number scheme
Recab UK
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