NXP Semiconductors TJA1128FTK/1Z

Overview

TJA1128FTK/1Z from NXP Semiconductors is a LIN Mini System Basis Chip (SBC) integrating a LIN transceiver, 3.3 V/85 mA LDO regulator, window watchdog, two level-sensitive WAKE inputs, one GPI, and an open-drain HVMPO output. It operates across 5.0–28 V battery supply, supports ISO 17987-4:2016 and SAE J2602, and enables STANDBY (22 µA) and SLEEP (14 µA) modes for automotive body electronics.

For engineers reviewing the TJA1128FTK/1Z datasheet, TJA1128FTK/1Z pinout, TJA1128FTK/1Z application, or TJA1128FTK/1Z equivalent, key selection criteria include LIN bus wake-up capability, configurable HVMPO limp-home function, SPI-configurable watchdog period (16–128 ms), and AEC-Q100 qualification for under-hood sensor nodes and door modules.

Technical Context

The TJA1128FTK/1Z implements a state-machine-based system controller supporting nine operating modes-including NORMAL, STANDBY, SLEEP, CONFIG, and OVERTEMP-with deterministic transitions triggered by EN, STBN, RSTN, and wake events. Its LIN transceiver includes integrated termination for responder applications and TXD dominant time-out protection.

Watchdog operation uses a microcontroller-independent clock source with Window, Timeout, and Autonomous modes; the HVMPO supports four programmable functions-cyclic wake bias control, limp-home output, GPI-controlled output, or state-dependent drive-configured via SPI register address 15h.

Key Specifications

Pinout & Package

HVSON14 package (SOT1086-2), 3.0 mm × 4.5 mm × 0.85 mm body, exposed thermal pad soldered to PCB ground for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LIN SBC applications.

Compared with TLIN1029DSWR and UJA1075ATW/3V3/1Z, the TJA1128FTK/1Z uniquely balances ultra-low quiescent current (14 µA SLEEP), dual configurable wake inputs, and multi-function HVMPO - making it optimal for space-constrained, safety-aware LIN endpoints where autonomous wake and limp-home are mandatory.

Availability

TJA1128FTK/1Z is available at Aetrix Electronics and suitable for automotive door modules, seat position sensors, roof consoles, and trunk actuators requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for TJA1128FTK/1Z 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 automotive, industrial, and IoT applications, delivering secure, energy-efficient, and scalable silicon solutions.

The TJA1128FTK/1Z belongs to NXP's LIN System Basis Chip portfolio, designed specifically for intelligent, low-power LIN network endpoints in automotive body electronics - emphasizing integration, functional safety, and robustness in harsh electrical environments.

FAQ

What LIN protocol versions does the TJA1128FTK/1Z support?

The TJA1128FTK/1Z supports LIN 2.0, LIN 2.1, LIN 2.2, and LIN 2.2A protocols, and is fully compliant with ISO 17987-4:2016 (12 V LIN) and SAE J2602-1. It maintains backward compatibility with earlier LIN physical layers including LIN 1.x variants, enabling interoperability across legacy and new vehicle architectures without protocol translation.

How does the TJA1128FTK/1Z achieve ultra-low power consumption in SLEEP mode?

The TJA1128FTK/1Z achieves 14 µA typical SLEEP-mode current by disabling the LDO regulator, LIN transceiver, and watchdog while retaining wake detection on LIN, WAKE1, and WAKE2 pins. The internal state machine remains active to monitor for wake events, and RSTN is forced LOW to ensure MCU reset - enabling rapid recovery without external supervision.

Can the HVMPO pin on the TJA1128FTK/1Z be used for both limp-home and cyclic wake functions?

No - the HVMPO pin on the TJA1128FTK/1Z is configured for one function at a time via the MPOMOD bits in register 15h. It can be set to limp-home output (011), cyclic wake bias control (010), GPI-controlled output (001), or state-driven logic (100–111). Simultaneous use requires external logic; the TJA1128FTK/1Z itself does not support concurrent HVMPO modes.

What is the purpose of the CONFIG mode in the TJA1128FTK/1Z, and how is it entered?

The CONFIG mode in the TJA1128FTK/1Z enables SPI-based device configuration (e.g., watchdog settings, wake enable, HVMPO mode) using pins TXD, EN, RXD, and STBN as SDI, SCK, SDO, and SCSN. It is entered from RESET mode when the device lacks a valid CRC value and VBAT exceeds Vth(config)min (typically 5.5 V); entry is confirmed by RXD going LOW after STBN goes HIGH.

Does the TJA1128FTK/1Z include built-in protection against automotive electrical transients?

Yes - the TJA1128FTK/1Z includes load dump protection up to 43 V on BAT, ±8 kV HBM ESD on LIN, ±6 kV IEC 61000-4-2 ESD on WAKE1/WAKE2/BAT, and ISO 7637-2/3 transient immunity on LIN and BAT pins. Its LIN bus pin is short-circuit proof to battery and ground, and overtemperature shutdown activates at 150 °C virtual junction temperature.