FlexRay Active Star Coupler – 2 Branch

Block Diagram

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TJA1086G Block Diagram

TJA1086G Block Diagram

Active star coupler that connects two branches of a FlexRay network

Active star coupler that connects two branches of a FlexRay network


Optimized for Time-Triggered Communication Systems

  • Compliant with FlexRay Electrical Physical Layer specification V3.0.1/ISO17458-4
  • Automotive product qualification in accordance with AEC-Q100
  • Data transfer rates from 2.5 Mbit/s to 10 Mbit/s
  • Supports 60 ns minimum bit time at 400 mV differential voltage
  • Low-power management for battery-supplied ECUs
  • Very low current consumption in AS_Sleep mode
  • Leadless HVQFN44 package with improved Automated Optical Inspection (AOI) capability


  • Supports autonomous active star operation independent of the host ensuring the TJA1086G remains active even if the host fails or is switched off
  • Branches can be independently configured
  • Branch extension via TRXD0/1 inner star interface
  • 16-bit bidirectional SPI interface up to 2 Mbit/s for host communication
  • Full host control over branch status
  • Enhanced wake-up capability:
    • Remote wake-up via wake-up pattern and dedicated FlexRay data frames
    • Local wake-up via pin LWU
    • Wake-up source recognition
    • configurable per branch
  • Enhanced supply voltage monitoring on VIO, VCC, VBUF and VBAT
  • Auto I/O level adaptation to host controller supply voltage VIO
  • Can be used in 14 V, 24 V and 48 V powered systems
  • Enhanced bus error detection - detects short-circuit conditions on the bus
  • Instant transmitter shut-down interface (BGE pin)
  • Selective branch shut-down (partial networking)


  • Bus pins protected against
  • 8 kV ESD pulses according to HBM and 6 kV ESD pulses according to IEC61000-4-2
  • All pins protected against 1000 V ESD according to CDM
  • All pins protected against 200 V ESD according to MM
  • No reverse currents from the digital input pins to VIO or VCC when the TJA1086G is not powered up
  • Bus pins short-circuit proof to battery voltage (14 V, 24 V or 48 V) and ground
  • Overtemperature detection and protection
  • Bus pins protected against transients in automotive environment (according to ISO 7637 class C)

Active Star Functional Classes

  • Active star - communication controller interface
  • Active star - bus guardian interface
  • Active star - voltage regulator control
  • Active star - logic level adaptation
  • Active star - host interface
  • Active star - increased voltage amplitude transmitter

Product Longevity Program

  • This product is included in the NXP Product Longevity Program ensuring a stable supply of products for your embedded designs. The TJA1086GHN/0Z is included in the 15-year program

Part numbers include: TJA1086GHN.


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