AS9100 Rev D/ISO 9001:2015 Certified
Serving the Aviation Industry since 1973
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SSD120 Altitude Encoder/Digitizer
SSD120-(XX)N Features:
  • FAA TSO-C88a and EASA ETSO-C88a Approval
  • Tested and Conforming to MIL-STD-704E and RTCA DO-160E
  • Operating Voltage +10 to +33Vdc
  • Low Power Consumption
  • Standard D-Subminiature Electrical Connectors or MIL Cylindrical Connectors
  • Dual 1/8-27NPT Static Port Inlets or Optional 1/8" Hose Barb with 360° Adjustable Swivel
  • All Aluminum Housings Treated to Resist Corrosion as per MIL-C-5541E or Anodized as per MIL-A-8625 or Black Powder Coat
  • Standard Operating Temperature Range: -20° to +70°C (-4° to +158°F)
  • Optionally Available with Extended Temperature Range: -55° to +70°C (-67° to +158°F)


The SSD120-(XX)C Series is designed to provide a rugged and reliable altitude digitizer for applications where size, weight and economy are critical.

Model SSD120-(XX)C Incorporates one (1) ICAO grey code port.

Model SSD120-(XX)C-RS232 Incorportates one (1) ICAO grey code port and two(2) RS232 serial altitude data outputs.

Trans-Cal Model SSD120-(XX)C Series of Altitude Digitizers are a simple and robust addition to any avionics installations requiring accurate pressure altitude information for multiple aircraft systems.

SSD120-(XX)C Features:
  • One (1) ICAO pressure Altitude Grey Code Output
  • Two (2) RS232 Serial Altitude Data Outputs
  • Selectable Serial Data Output (Choose from six (6) baud rate & message combinations)
  • FAA TSO-C88a and ETSO-C88a Approved
  • Tested and Conforming to MIL-STD-704E and RTCA DO-160E
  • Operating Altitude Range -1000 to +35,000 feet
  • Operating Voltage +10 to +33Vdc
  • Operating Standard Temperature Range: -20C to +70C
  • Weight: 4.3 oz.
  • 42 Month Warranty
  • Calculated MTBF in excess of 8 years!



SSD120-(XX)N
SSD120-(XX)N-RS232
SSD120-(XX)N1-RS232
SSD120-(XX)C-RS232