NXP Semiconductors UJA1076TW/5V0/WD,1

Overview

UJA1076TW/5V0/WD from NXP Semiconductors is a high-speed CAN core System Basis Chip (SBC) integrating a CAN transceiver compliant with ISO 11898-2/5, a 5 V ±2 % voltage regulator delivering up to 250 mA for microcontrollers, an independent 5 V CAN transceiver supply (V2), a programmable window/timeout watchdog, and full-duplex SPI interface - deployed in automotive Electronic Control Units for controlled power-up, diagnostics, and limp-home safety response.

For engineers reviewing the UJA1076TW/5V0/WD datasheet, UJA1076TW/5V0/WD pinout, UJA1076TW/5V0/WD application, or UJA1076TW/5V0/WD equivalent, key selection criteria include its HTSSOP32 package with exposed die pad, dual-regulator architecture enabling cranking operation down to 4.5 V (V1) and 5.5 V (V2), wake-up source detection on WAKE1/WAKE2, and SPI-configurable system modes (Standby/Normal/Sleep) with overtemperature shutdown and LIMP output activation.

Technical Context

The UJA1076TW/5V0/WD implements a state-machine-based system controller managing five operating modes (Off, Standby, Normal, Sleep, Overtemp) with deterministic transitions triggered by battery voltage thresholds, wake events, or register writes. Its CAN transceiver features SPLIT pin stabilization, floating bus pins in Off mode, and ±58 V short-circuit protection on CANH/CANL.

Power management includes two independent regulators: V1 (5 V, 250 mA, ±2 % accuracy, extendable via external PNP transistor) and V2 (5 V dedicated for CAN transceiver), both supporting undervoltage warning (90 % threshold) and configurable reset thresholds (90 % or 70 %). The on-chip oscillator drives the watchdog independently of V1/V2 supplies.

Key Specifications

Pinout & Package

Package: HTSSOP32 (SOT549-1), thermally enhanced plastic thin shrink small outline package with 32 leads, 6.1 mm body width, 0.65 mm lead pitch, and exposed die pad (electrically isolated, may be left floating or connected to GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar System Basis Chip applications.

Compared with TJA1042TK/3 and UJA1075TW/5V0/WD, the UJA1076TW/5V0/WD delivers integrated dual-regulator architecture with isolated V2, enabling superior EMC, independent fault monitoring, and simplified layout - making it optimal for new automotive ECU designs demanding compact, robust, and diagnostics-rich SBC functionality.

Availability

UJA1076TW/5V0/WD is available at Aetrix Electronics and suitable for automotive Body Control Modules, Engine Control Units, Transmission Control Units, and ADAS ECUs requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified reliability.

Supply support for UJA1076TW/5V0/WD 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 applications, with deep expertise in CAN, SBC, and automotive power management ICs.

The UJA1076TW/5V0/WD belongs to NXP's System Basis Chip product line, designed specifically for automotive Electronic Control Units to consolidate discrete power, interface, and safety functions into a single AEC-Q100 qualified device with advanced diagnostics and low-power operation.

FAQ

What is the primary function of the UJA1076TW/5V0/WD in an automotive ECU?

The UJA1076TW/5V0/WD serves as a core System Basis Chip that integrates a high-speed CAN transceiver, dual voltage regulators (5 V V1 for MCU and 5 V V2 for CAN), a programmable watchdog, SPI interface, wake-up inputs, and limp-home output. It replaces multiple discrete components in automotive ECUs to ensure controlled power-up, robust communication, fault diagnostics, and fail-safe response - all within a single HTSSOP32 package.

Does the UJA1076TW/5V0/WD support operation during automotive cranking conditions?

Yes, the UJA1076TW/5V0/WD supports cranking operation: its V1 regulator remains functional down to 4.5 V (per ISO 7637-4b and ISO 16750-2), and V2 operates down to 5.5 V (per ISO 7637-4). This ensures uninterrupted microcontroller supply and CAN communication during engine start-up voltage sags, a critical requirement for Body Control Modules and Engine Control Units.

How does the watchdog in the UJA1076TW/5V0/WD differ between Window and Timeout modes?

In Window mode, the UJA1076TW/5V0/WD requires watchdog triggers within a defined time window (first half of period) to avoid reset; triggering too early or missing the window causes immediate reset. In Timeout mode, any trigger resets the timer, and overflow sets a cyclic interrupt - only overflow with pending interrupt causes reset. Both modes use the same on-chip oscillator and support programmable periods from 8 ms to 4096 ms.

Can the UJA1076TW/5V0/WD supply external components beyond the microcontroller?

Yes, the UJA1076TW/5V0/WD's V1 regulator delivers up to 250 mA at 5 V ±2 % and is explicitly designed to power not only the microcontroller but also its peripherals and additional external transceivers. An external PNP transistor can be added via VEXCTRL/VEXCC pins to increase current capability and distribute heat across the PCB - confirmed in Section 2.1 and Figure 7 of the datasheet.

What safety mechanisms does the UJA1076TW/5V0/WD provide for automotive fail-operational systems?

The UJA1076TW/5V0/WD provides overtemperature shutdown with automatic LIMP output activation, configurable undervoltage interrupts on V1/V2, hardware watchdog with window mode, bidirectional RSTN with variable reset timing, and SPI-accessible status registers for real-time diagnostics. These features enable fail-operational behavior in systems like ADAS ECUs, where the UJA1076TW/5V0/WD can assert LIMP to activate mechanical fallbacks independently of MCU software state.