NXP Semiconductors UJA1076TW/3V3,118

Overview

UJA1076TW/3V3,118 from NXP Semiconductors is a high-speed CAN core System Basis Chip (SBC) integrating a 3.3 V/250 mA microcontroller regulator, ISO 11898-2/5-compliant CAN transceiver, SPI interface, dual wake-up inputs, limp-home output, and watchdog-designed for automotive ECU power management and communication. It enables controlled MCU startup, bus wake-up detection, and fault-safe operation in engine control, body electronics, and ADAS modules.

For engineers reviewing the UJA1076TW/3V3,118 datasheet, UJA1076TW/3V3,118 pinout, UJA1076TW/3V3,118 application, or UJA1076TW/3V3,118 equivalent, key selection criteria include 3.3 V regulator accuracy (±2 %), CAN bus short-circuit robustness (±58 V), ESD protection (±8 kV HBM on CAN/wake pins), and HTSSOP32 thermal performance with exposed die pad.

Technical Context

The UJA1076TW/3V3,118 implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp modes with deterministic transitions triggered by VBAT thresholds, wake events, or temperature faults. Its SPI interface operates full-duplex with register-mapped configuration (WD_and_Status, Mode_Control, Int_Control) and supports read-only access to preserve status integrity during diagnostics.

Power architecture separates V1 (3.3 V/250 mA MCU supply) and V2 (5 V CAN transceiver supply), each with independent undervoltage monitoring (90 % recovery threshold) and configurable reset behavior. The integrated watchdog uses an on-chip oscillator and supports Window/Timeout/Off modes with programmable periods (128 ms default) and automatic re-enable on interrupt.

Key Specifications

Pinout & Package

UJA1076TW/3V3,118 uses a 32-pin HTSSOP package (SOT549-1) with 6.1 mm body width, 0.65 mm lead pitch, and thermally enhanced exposed die pad (electrically isolated, may be connected to GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UJA1076TW/3V3,118, TJA1043TK/3V3/CM requires full external power management, increasing BOM count and layout complexity, while UJA1075TW/3V3,118 offers identical integration minus watchdog-enabling cost-optimized designs where functional safety certification is not mandated.

Availability

UJA1076TW/3V3,118 is available at Aetrix Electronics and suitable for automotive engine control, body electronics, ADAS sensor hubs, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for UJA1076TW/3V3,118 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in CAN, SBC, and automotive-grade power management.

The UJA1076 product line delivers integrated System Basis Chips for automotive ECUs, combining CAN transceivers, multi-rail regulators, watchdogs, and diagnostics to simplify ECU design and enhance reliability in harsh environments.

FAQ

What is the nominal output voltage and accuracy of the main regulator in UJA1076TW/3V3,118?

The UJA1076TW/3V3,118 features a 3.3 V main voltage regulator (V1) with ±2 % output accuracy across temperature and load. This precision ensures stable operation of connected microcontrollers and peripherals, even during automotive cranking conditions where battery voltage drops to 4.5 V. The regulator supports external PNP transistor extension for higher current demands beyond its native 250 mA capability.

Does UJA1076TW/3V3,118 include a watchdog timer, and how is it configured?

Yes, UJA1076TW/3V3,118 includes an advanced independent watchdog with Window, Timeout, and Off modes, clocked by an on-chip oscillator. Configuration is performed via the WD_and_Status register using the WMC bit and NWP[2:0] bits to set the watchdog period (default 128 ms). The watchdog can be disabled by pulling WDOFF HIGH or setting WMC = 1 in Standby mode, and automatically re-enables upon pending interrupt.

How does UJA1076TW/3V3,118 handle CAN bus fault conditions such as short circuits?

UJA1076TW/3V3,118 provides ±58 V short-circuit protection on CANH and CANL pins, preventing damage from load dump, reverse battery, or wiring faults. Its CAN transceiver complies with ISO 11898-2 and ISO 11898-5, and includes SPLIT pin support for common-mode stabilization. During overtemperature events, it asserts LIMP LOW and drives RSTN LOW to initiate fail-safe behavior.

What package type and thermal characteristics does UJA1076TW/3V3,118 use?

UJA1076TW/3V3,118 uses the HTSSOP32 package (SOT549-1) measuring 6.1 mm × 11 mm with 0.65 mm lead pitch and an exposed die pad. The pad is electrically isolated and may be connected to GND for improved thermal dissipation. This construction achieves low thermal resistance, supporting reliable operation in automotive under-hood environments up to 150 °C junction temperature.

Can UJA1076TW/3V3,118 operate with a 5 V microcontroller supply instead of 3.3 V?

No-UJA1076TW/3V3,118 is specifically configured for 3.3 V V1 output. For 5 V MCU supply, the functionally identical UJA1076TW/5V0,118 variant must be used. Both share the same HTSSOP32 package, pinout, and feature set except for regulator voltage; substituting one for the other without verifying V1 compatibility will cause MCU under-voltage or damage.