TT21 Mode S Transponder

Part No:

Manufacturer: TRIG




  • Compact form factor – takes minimal panel space, fits in a compact or standard 57mm instrument hole.
  • Minimal depth – create space on your panel for other avionics.
  • Integrated altitude encoder
  • Certified for IFR / VFR flight
  • Manual dimming feature (adjustable backlight)
  • Low power consumption
  • EASA ETSO and FAA TSO Certification – includes TSO-C166b the latest ADS-B standard
  • Free European Minor Change approvals
  • Free FAA ADS-B STC for 576 aircraft types
  • Unbeatable value and quality – designed and manufactured in the U.K.
Specification TT21 Transponder TT22 Transponder
Type Transponder Class 2 Mode S level 2els ADS-B Class B0 Transponder Class 1 Mode S level 2els
ADS-B Class B1S
Certification ETSO C88A, C112C, C166A
TSO C88b, C112c, C166b, approved for IFR and VFR flight
Compliance ED-73C, DO-160F, DO-178B Level B, DO-254
Level C, DO-260B, DO-181D
Supply voltage (DC) 9-33 V
Typical consumption (at 14v) idle: 0.15 A active: 0.28 A idle: 0.15A active: 0.34 A
Nominal Transmitter Power 130 W at connector 250 W at connector
Operating temperature for the transponder -40°C to +70°C
for the controller -25°C to +70°C
Cooling requirement no fan required
Weight (hardware back box) 440g / 0.8 lbs
Weight (TC20 control head) 90g / 0.11 lbs
Dimensions (mm) controller: H 44 x W 63 x L 54 mm
transponder in tray: H 48 x W 68 x L 160 mm
Dimensions (inches) controller: H 1.8 x W 2.4 x L 2.1 inches
transponder in tray: H 1.8 x W 2.6 x L 6.2 inches





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