TJA1128BTK/1Z

Specialized Overview

The TJA1128BTK/1Z is a LIN Mini System Basis Chip (SBC) from NXP Semiconductors, designed for automotive applications with a nominal 12 V system. It integrates a LIN transceiver compliant with ISO 17987-4:2016 and SAE J2602 standards, supporting baud rates up to 20 kBd. The device includes a low-dropout voltage regulator (LDO) providing 3.3 V output with an 85 mA current capability. Additional integrated features include a window watchdog, two local wake-up inputs (WAKE1, WAKE2), a general-purpose input (GPI), and a high-voltage multipurpose output (HVMPO). It operates within a battery supply range of 5.0 V to 28 V and supports very low current consumption in STANDBY and SLEEP modes.

Specialized Feature Summary

• Integrates a LIN transceiver, LDO voltage regulator, window watchdog, and multiple I/O pins into a single HVSON14 package.
• Supports configurable wake-up sources including remote LIN bus signals and local level-sensitive or cyclic sampled detection via WAKE1 and WAKE2.
• Features quasi one-time configuration via SPI to customize functions such as watchdog periods, reset pulse widths, and HVMPO modes.
• Includes robust protection mechanisms such as overtemperature shutdown, limp home functionality, and ESD protection rated at ±8 kV on the LIN pin.

Specialized Applications

• Body Control Modules (BCM)
• Seat control units
• Sensor nodes requiring cost-effective integration

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact LDO output voltage, number of wake-up inputs, and watchdog availability. Ensure that the component meets the required AEC-Q100 qualification standards for your specific automotive application environment before finalizing procurement.

Specialized Selection Notes

Select the TJA1128B variant specifically when a 3.3 V microcontroller supply is required, as opposed to the 5.0 V option found in other family members. Confirm whether the application necessitates a built-in window watchdog; if not, consider variants without this feature to optimize cost. Evaluate the need for local wake-up inputs to determine if the B variant's single WAKE input suffices or if a dual-input variant is necessary.

Specialized Part Context

The TJA1128 belongs to the TJA1128x family of LIN mini system basis chips. This series is engineered to reduce bill-of-materials complexity by consolidating discrete components like transceivers, regulators, and watchdogs into a compact leadless HVSON14 package. It serves as a central interface node for LIN-based automotive networks, enabling efficient power management and communication.

Specialized Replacement Considerations

Direct replacements within the same family include TJA1128A, C, D, E, F, G, and H. Selection depends on matching the LDO voltage (3.3 V vs 5.0 V), presence of a watchdog, and number of wake-up inputs. Verify pin compatibility and configuration register mappings before substitution.