NXP Semiconductors TJA1081BTS,112

Overview

TJA1081BTS,112 from NXP Semiconductors is a FlexRay node transceiver compliant with FlexRay V3.0.1 physical layer specification, implementing the JASPAR 'Bus driver increased voltage amplitude transmitter' functional class. It operates at data rates from 2.5 Mbit/s to 10 Mbit/s, supports 14 V/24 V/48 V automotive systems, and provides differential transmit/receive capability between protocol controller and FlexRay bus in safety-critical vehicle networks.

For engineers reviewing the TJA1081BTS,112 datasheet, TJA1081BTS,112 pinout, TJA1081BTS,112 application, or TJA1081BTS,112 equivalent, key selection considerations include its AEC-Q100 qualification, integrated low-power management (Sleep/Standby modes), remote/local wake-up support, fail-silent undervoltage behavior, and ESD protection up to ±6 kV on bus pins.

Technical Context

The TJA1081BTS,112 implements a dual-supply architecture with independent ramp-up for VBAT (4.75 V–60 V), VCC (+5 V), and VIO (host controller I/O level adaptation). Its state machine manages five operating modes-Normal, Receive-only, Standby, Go-to-sleep, and Sleep-with automatic transitions triggered by EN/STBN pins, undervoltage flags (UVVBAT/UVVCC/UVVIO), or wake events.

It features dedicated diagnostics including overtemperature detection, short-circuit monitoring on BP/BM, clamping diagnosis on TXEN, and BGE status feedback. Bus error detection compares TXD input with received BP/BM data, while ERRN pin signals either wake-up (in low-power modes) or error conditions (in Normal/Receive-only modes), configurable via STBN/EN logic levels.

Key Specifications

Pinout & Package

Package: SSOP16 (SOT338-1), plastic shrink small outline package, 16 leads, body width 5.3 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FlexRay transceiver applications.

Compared with TJA1081BTS,112, the TJA1080ATS/0Z offers reduced electromagnetic robustness in unshielded harnesses, while the MC33662AEKR2 trades JASPAR compliance for integrated system monitoring-neither provides drop-in replacement without validation of bus timing, voltage margins, and wake-up behavior.

Availability

TJA1081BTS,112 is available at Aetrix Electronics and suitable for Advanced Driver Assistance Systems (ADAS), Powertrain Control Units (PCU), and Electric Vehicle Battery Management Systems (BMS) requiring stable component supply across automotive production lifecycles.

Supply support for TJA1081BTS,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in automotive networking and functional safety.

The TJA1081BTS,112 belongs to NXP's FlexRay transceiver product line, designed specifically for time-triggered, safety-critical vehicle networks demanding deterministic latency, high EMC resilience, and fail-operational behavior.

FAQ

What is the primary compliance standard met by the TJA1081BTS,112?

The TJA1081BTS,112 is fully compliant with the FlexRay electrical physical layer specification V3.0.1 and implements the JASPAR-specific 'Bus driver increased voltage amplitude transmitter' functional class. It also meets AEC-Q100 Grade 1 qualification for automotive reliability. This dual compliance ensures interoperability in time-triggered automotive networks where high noise immunity and deterministic timing are mandatory. The TJA1081BTS,112 achieves ±2.5 V differential output swing to satisfy JASPAR's voltage amplitude requirement.

How does the TJA1081BTS,112 handle undervoltage conditions on its supply pins?

The TJA1081BTS,112 implements independent undervoltage detection on VBAT, VCC, and VIO pins, triggering defined fail-silent responses: UVVBAT forces Sleep mode, UVVCC forces Standby mode, and UVVIO internally forces TXEN HIGH and EN/STBN LOW. All three conditions cause the digital state machine to enter a passive, predictable state-preventing undefined bus driving. The TJA1081BTS,112 also generates corresponding flags (UVVBAT/UVVCC/UVVIO) readable by the host microcontroller for diagnostic logging.

What wake-up mechanisms does the TJA1081BTS,112 support, and how are they differentiated?

The TJA1081BTS,112 supports both local wake-up via the WAKE pin (edge-triggered with configurable pull-up/pull-down) and remote wake-up via bus patterns (DATA_0/DATA_1 sequence) or dedicated FlexRay data frames. Local wake-up sets the local wake-up source flag; remote wake-up sets the remote wake-up source flag. Both flags combine into a single wake flag that drives ERRN LOW in low-power modes. The TJA1081BTS,112 distinguishes sources by reading internal status registers after wake-up, enabling precise root-cause analysis in safety-critical systems.

What is the role of the BGE pin in the TJA1081BTS,112, and how does it interact with transmitter control?

The BGE (Bus Guardian Enable) pin on the TJA1081BTS,112 is an active-LOW input that disables the transmitter independently of TXEN, allowing coordination with an external bus guardian IC. When BGE is LOW, the transmitter is disabled regardless of TXD or TXEN state-ensuring strict enforcement of bus access timing. This feature is essential for systems requiring hardware-enforced time-slot arbitration. In the TJA1081BTS,112, BGE and TXEN form a two-level safety interlock: TXEN controls functional enable, while BGE provides fail-safe override.

How does the TJA1081BTS,112 ensure electromagnetic compatibility in unshielded automotive harnesses?

The TJA1081BTS,112 achieves EMC compliance through very low electromagnetic emissions (EME) and high electromagnetic immunity (EMI): its differential receiver supports a wide common-mode range to reject noise, and its transmitter uses controlled slew rates to minimize spectral content. It meets industry standards for unshielded cable use without external filters. The TJA1081BTS,112 also integrates ±6 kV ESD protection on bus pins per IEC61000-4-2 and withstands ISO 7637-2 transients-reducing system-level EMC design effort and component count.