NXP Semiconductors UJA1076ATW/5V0,118

Overview

UJA1076ATW/5V0,118 from NXP Semiconductors is a high-speed CAN core System Basis Chip (SBC) integrating a 5 V/250 mA microcontroller voltage regulator (V1), ISO 11898-2/5-compliant CAN transceiver, SPI interface, dual local wake-up inputs, limp home output, and advanced watchdog with window/timeout modes. It replaces discrete ECU power, communication, and safety functions in automotive body control modules and gateway ECUs.

For engineers reviewing the UJA1076ATW/5V0,118 datasheet, UJA1076ATW/5V0,118 pinout, UJA1076ATW/5V0,118 application, or UJA1076ATW/5V0,118 equivalent, key selection criteria include its 5 V V1 regulator accuracy (±2 %), CAN bus short-circuit robustness (±58 V), 8 kV HBM ESD on wake/CAN pins, HTSSOP32 thermal performance, and programmable watchdog timing (128 ms default).

Technical Context

The UJA1076ATW/5V0,118 implements a dedicated system controller state machine managing Off/Standby/Normal/Sleep/Overtemp mode transitions triggered by VBAT thresholds, wake events, or register writes. Its dual-regulator architecture isolates V1 (5 V for MCU) from V2 (5 V for CAN transceiver), enabling independent undervoltage monitoring and EMC-optimized bus operation.

SPI communication uses full-duplex 16-bit framing with register-mapped access (WD_and_Status, Mode_Control, Int_Control, Int_Status), while hardware-level safety features include overtemperature shutdown, bidirectional RSTN with configurable reset length, and LIMP output activation during critical faults. The watchdog operates from an independent on-chip oscillator, unaffected by V1/V2 supply states.

Key Specifications

Pinout & Package

UJA1076ATW/5V0,118 is housed in a 32-pin HTSSOP package (SOT549-1) with exposed thermal pad. Pin functions are validated per NXP Rev. 3.0 datasheet (Dec 2024), including dedicated V1/V2 regulators, CANH/CANL transceiver I/O, SPI interface (SDI/SDO/SCK/SCSN), dual wake-up inputs (WAKE1/WAKE2), and safety-critical outputs (RSTN, INTN, LIMP, EN).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TJA1043TK/0Z and UJA1075ATW/5V0,118, the UJA1076ATW/5V0,118 uniquely delivers integrated V2 regulation, LIMP output, and watchdog - making it optimal for ASIL-B-compliant gateways and safety-critical body controllers requiring autonomous fault response.

Availability

UJA1076ATW/5V0,118 is available at Aetrix Electronics and suitable for automotive body control modules, powertrain gateways, ADAS sensor hubs, and EV battery interface applications requiring stable component supply, AEC-Q100 qualification, and long-term automotive lifecycle support.

Supply support for UJA1076ATW/5V0,118 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 specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in automotive electronics and functional safety.

The UJA1076A product line delivers integrated System Basis Chips for automotive ECUs, designed to consolidate power, communication, and safety functions into single-package solutions meeting AEC-Q100 Grade 0/1 and ISO 26262 requirements.

FAQ

What is the primary function of the UJA1076ATW/5V0,118 in an automotive ECU?

The UJA1076ATW/5V0,118 serves as a core System Basis Chip that integrates a 5 V/250 mA microcontroller regulator (V1), a dedicated 5 V CAN transceiver regulator (V2), an ISO 11898-2/5-compliant CAN transceiver, SPI interface, watchdog, and wake-up logic. It replaces discrete components in automotive ECUs to reduce size, cost, and design complexity while enhancing reliability and safety.

Does the UJA1076ATW/5V0,118 support both 3.3 V and 5 V microcontroller supplies?

No - the UJA1076ATW/5V0,118 is specifically the 5 V version of the UJA1076A family. Its V1 regulator delivers a fixed 5 V ±2 % output. The 3.3 V variant is designated UJA1076ATW/3V3,118. The '/5V0' suffix in UJA1076ATW/5V0,118 explicitly confirms the 5 V V1 output configuration.

How does the watchdog in the UJA1076ATW/5V0,118 differ from basic timeout watchdogs?

The UJA1076ATW/5V0,118 implements an advanced watchdog with three distinct modes: Window, Timeout, and Off. In Window mode, it requires triggering within a defined time window (not just before expiry), preventing premature or late resets. Its default 128 ms period and independent on-chip oscillator ensure timing integrity even if V1/V2 supplies are unstable - a key differentiator from basic timeout-only watchdogs.

Can the UJA1076ATW/5V0,118 operate during automotive cranking conditions?

Yes - the UJA1076ATW/5V0,118 is designed for automotive cranking, supporting V1 operation down to 4.5 V VBAT and V2 operation down to 5.5 V VBAT per ISO 7637 and ISO 16750-2. Its V1 regulator maintains ±2 % accuracy and stable output under these low-voltage transients, ensuring continuous MCU power during engine start.

What safety features does the UJA1076ATW/5V0,118 provide for ASIL-B compliance?

The UJA1076ATW/5V0,118 supports ASIL-B compliance through multiple hardware safety mechanisms: overtemperature shutdown, programmable watchdog with independent clock source, LIMP output for fail-safe hardware activation, bidirectional RSTN with configurable timing, and detailed status reporting via SPI registers (WD_and_Status, Int_Status). These features enable systematic fault detection and controlled response per ISO 26262 requirements.