UJA1078TW/5V0,112

Specialized Overview

The UJA1078TW/5V0,112 is a System Basis Chip (SBC) integrating a high-speed CAN transceiver compliant with ISO 11898-2 and ISO 11898-5, alongside two LIN transceivers supporting LIN 2.1, LIN 2.0, SAE J2602, and LIN 1.3. It features a scalable 5 V main voltage regulator (V1) delivering up to 250 mA for microcontroller supply, extendable via an external PNP transistor. A dedicated 5 V regulator (V2) powers the on-board CAN transceiver independently. The device includes a programmable watchdog with Window and Timeout modes, a full-duplex 16-bit SPI interface, two local wake-up ports, and a limp home output. It operates within a -40 °C to +125 °C temperature range in a 32-lead HTSSOP package.

Specialized Feature Summary

• Integrates high-speed CAN and dual LIN interfaces with advanced low-power concepts and safe system start-up behavior.
• Features a scalable 5 V voltage regulator capable of 250 mA output, with options for external heat distribution via PNP transistors.
• Provides comprehensive diagnostic capabilities including a programmable watchdog, detailed status reporting, and interrupt outputs.
• Ensures robust automotive reliability with ±8 kV HBM ESD protection and transient immunity per ISO 7637-3.

Specialized Applications

• Electronic Control Units (ECU) requiring integrated power management and networking.
• Automotive sensor peripherals controlled via local sub-busses.
• Power control applications utilizing high-speed CAN as the main network interface.

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's current product data sheet to confirm regulatory compliance and feature set. Ensure the component matches the required voltage regulator configuration and package type for your design. Cross-reference the part number with official distributor catalogs to validate authenticity and availability status before finalizing procurement plans.

Specialized Selection Notes

Select this component when designing ECUs that require a unified solution for CAN/LIN communication and microcontroller power regulation. Consider the external PNP transistor option if higher current handling or improved thermal dissipation across the PCB is necessary. Verify compatibility with the target microcontroller's reset timing and SPI interface requirements during the initial hardware architecture phase.

Specialized Part Context

This component belongs to NXP's UJA1078 family of System Basis Chips, designed specifically for automotive electronic control units. It consolidates discrete components into a single package to reduce board space and improve system reliability. The family supports various voltage configurations and watchdog implementations to meet diverse automotive networking standards.

Specialized Replacement Considerations

The datasheet indicates downward compatibility with the TJA1042 CAN transceiver. Designers should verify pin-to-pin compatibility and electrical parameter alignment if substituting discrete CAN transceivers. No direct single-package replacements are explicitly listed in the provided documentation; consult the manufacturer for updated family members.