UJA1078ATW/3W/2Z

Overview

The UJA1078ATW/3W/2Z is a high-speed CAN and dual LIN core System Basis Chip (SBC) from NXP Semiconductors, designed for automotive electronic control units. It integrates a high-speed CAN transceiver compliant with ISO 11898-2 and ISO 11898-5 standards, alongside two LIN 2.1-compatible transceivers. The device features an advanced independent watchdog timer with window and timeout modes, a serial peripheral interface for microcontroller communication, and a 250 mA voltage regulator for the microcontroller. It includes a dedicated 5 V regulator for the CAN transceiver and supports low-power concepts with detailed status reporting.

Feature Summary

• Integrates high-speed CAN transceiver and dual LIN transceivers for comprehensive ECU networking capabilities
• Includes an advanced independent watchdog timer with window and timeout modes for system safety
• Provides a 250 mA voltage regulator for the microcontroller and a separate 5 V regulator for the CAN transceiver
• Features enhanced electromagnetic compatibility performance with robust electrostatic discharge protection

Applications

• Automotive electronic control units requiring integrated power and sensor peripheral control
• Networking applications utilizing high-speed CAN as the primary bus interface
• Systems employing LIN interfaces as local auxiliary buses for peripheral management

Procurement Notes

Verify the specific suffix '3W/2Z' against official NXP documentation to confirm pinout and feature configuration, as ordering suffixes define functional variants. Ensure the component matches the HTSSOP32 package requirements for your PCB layout. Cross-reference the discontinuation notice for related models like UJA1078ATW/3V3/WD1T if availability is constrained. Confirm RoHS compliance and deep green status for environmental regulations.

Selection Notes

Select this SBC when a single package solution is needed to replace discrete CAN/LIN transceivers and power regulators in automotive ECUs. It is suitable for designs requiring strict EMC performance and robust transient protection on battery and bus lines. Consider the 250 mA output current limit for the MCU regulator; external PNP transistors may be required for higher current demands or improved thermal distribution. Ensure the microcontroller supports SPI communication for SBC configuration and status monitoring.

Part Context

The UJA1078A series represents NXP's core SBC architecture, combining essential ECU functions into a compact HTSSOP32 package. This integration reduces board space and simplifies design by merging communication interfaces with power management. The family supports various voltage regulator options and watchdog configurations, catering to diverse automotive networking needs while maintaining backward compatibility with established transceiver standards.

Replacement Considerations

Officially documented substitute part numbers include UJA1078ATW/3W/2. Verify functional equivalence regarding voltage regulator outputs and watchdog features before substitution.