UJA1076ATW/3V3/WDJ

Specialized Overview

The UJA1076ATW/3V3/WDJ is a high-speed CAN core system basis chip 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, an advanced independent watchdog, and two voltage regulators. The main regulator (V1) provides a scalable 3.3 V output at up to 250 mA, while the dedicated CAN transceiver regulator (V2) supplies 5 V. The device operates within a supply voltage range of 4.5 V to 28 V and supports data rates up to 1 Mb/s. It features a full-duplex 16-bit SPI interface, two local wake-up ports, and a limp-home output. Packaged in a 32-lead HTSSOP format, it includes enhanced EMC performance and ±8 kV ESD protection on bus pins.

Specialized Feature Summary

• Integrates a high-speed CAN transceiver with a dedicated low-dropout voltage regulator to significantly improve electromagnetic compatibility performance.
• Features an advanced independent watchdog supporting Window and Timeout modes with an on-chip oscillator for reliable system monitoring.
• Includes a scalable 3.3 V main voltage regulator capable of delivering up to 250 mA, extendable via external PNP transistor for improved heat distribution.
• Provides comprehensive diagnostic capabilities through a 16-bit serial peripheral interface and detailed status reporting on system levels.

Specialized Applications

• Automotive electronic control units requiring high-speed Controller Area Network interfaces
• Power and sensor peripheral networking applications in vehicles
• Systems utilizing remote flash programming via the CAN bus

Specialized Procurement Notes

Verify component authenticity by checking the manufacturer's marking code against official documentation. Confirm the specific ordering suffix matches the required voltage regulator version and watchdog configuration. Ensure the package type aligns with the design footprint requirements. Cross-reference the revision level to guarantee compatibility with existing firmware drivers.

Specialized Selection Notes

Select this variant when a 3.3 V microcontroller supply is required alongside high-speed CAN communication. The integrated watchdog is essential for safety-critical applications needing window or timeout monitoring. Consider the thermal dissipation limits of the HTSSOP32 package and utilize the external PNP transistor option if load currents approach the maximum rated capacity.

Specialized Part Context

This component belongs to the UJA1076A family of core system basis chips. It serves as a consolidated solution replacing discrete components typically found in ECUs. The part number indicates the inclusion of a 3.3 V regulator and the watchdog feature, distinguishing it from variants lacking these specific integrations.

Specialized Replacement Considerations

Direct replacements must match the HTSSOP32 package and pinout. Verify that substitute parts support the same ISO 11898-2 compliance and offer equivalent watchdog functionality. Ensure the replacement maintains the 250 mA current capability for the main voltage regulator.