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NXP Semiconductors UJA1076TW/3V3/WD:1
- Part No.:
- UJA1076TW/3V3/WD:1
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1076TW/3V3/WD:1.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,031
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Product details
Overview
UJA1076TW/3V3/WD:1 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, advanced window/timeout watchdog, SPI interface, and dual local wake-up inputs - designed for automotive ECU power and communication management in engine control, body electronics, and ADAS modules.
For engineers reviewing the UJA1076TW/3V3/WD:1 datasheet, UJA1076TW/3V3/WD:1 pinout, UJA1076TW/3V3/WD:1 application, or UJA1076TW/3V3/WD:1 equivalent, key selection criteria include its 3.3 V ±2 % regulated output, 32-pin HTSSOP package with exposed die pad, CAN bus short-circuit protection up to ±58 V, 64 ms wake bias sampling, and configurable limp-home output for fail-safe operation.
Technical Context
The UJA1076TW/3V3/WD:1 implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp modes with deterministic transitions triggered by VBAT thresholds, CAN activity, or local wake events. Its on-chip oscillator independently clocks the watchdog, decoupling timing integrity from V1/V2 supply stability.
Power sequencing is enforced via programmable reset pulse width (long/short), bidirectional RSTN pin, and voltage-dependent undervoltage detection (90 % or 70 % V1 threshold). The SPI interface operates full-duplex at up to 10 MHz with register-mapped access to WD_and_Status, Mode_Control, and Int_Status registers for real-time diagnostics and mode control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Output Voltage | 3.3 V ±2 % - powers microcontroller and peripherals with precision regulation under cranking conditions (VBAT ≥ 4.5 V) |
| CAN Transceiver Standard | ISO 11898-2 and ISO 11898-5 compliant - ensures interoperability with TJA1042 and robust high-speed CAN network integration |
| Watchdog Modes | Window, Timeout, and Off - configurable via WMC bit and WDOFF pin for safety-critical timing supervision |
| Wake-up Inputs | WAKE1 and WAKE2 with selectable 16 ms or 64 ms sampling - enables low-current standby with reliable external switch detection |
| Limp-home Output | Dedicated LIMP pin driven LOW during Overtemp or serious fault - activates hardware-level fail-safe response without MCU intervention |
| Package | HTSSOP32 (SOT549-1), 6.1 mm × 11 mm, 0.65 mm pitch, exposed die pad - provides low thermal resistance for automotive under-hood environments |
| ESD Protection | ±8 kV HBM on CAN/wake pins - meets automotive EMC requirements for harsh electrical environments |
Pinout & Package
UJA1076TW/3V3/WD:1 uses a 32-pin HTSSOP package (SOT549-1) with an exposed die pad for enhanced thermal dissipation. The pad is electrically isolated and may be left floating or connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 4) | Main regulator output | 3.3 V ±2 % supply for MCU and peripherals; supports external PNP extension for >250 mA load sharing |
| RSTN (Pin 6) | Bidirectional reset | Drives LOW during power-on, watchdog fault, or overtemperature; accepts external reset assertion |
| INTN (Pin 7) | Interrupt output | Active-low signal indicating V1/V2 undervoltage, CAN/local wake-up, or cyclic interrupt events |
| EN (Pin 8) | Enable output | Controls external safety-critical hardware; driven HIGH only in Normal mode per ENC bit setting |
| SDI/SDO/SCK/SCSN (Pins 9–12) | SPI interface | Full-duplex 16-bit SPI for configuration, status readback, and diagnostic register access |
| TXDC/RXDC (Pins 13–14) | CAN logic interface | Connects to MCU's CAN controller; isolates digital domain from bus-side transceiver |
| WDOFF (Pin 16) | Watchdog disable | Hardware override: HIGH disables watchdog regardless of WMC setting |
| LIMP (Pin 17) | Limp-home control | Asserted LOW during Overtemp or software-triggered limp-home activation for hardware fail-safe |
| WAKE1/WAKE2 (Pins 18–19) | Local wake inputs | Digital wake sources with configurable sampling and bias control via WBIAS (Pin 28) |
| V2 (Pin 20) | CAN transceiver supply | Dedicated 5 V regulator for internal CAN PHY - independent of V1, improving EMC and bus stability |
| CANH/CANL (Pins 21–22) | CAN bus interface | High-speed differential bus terminals with ±58 V short-circuit tolerance and floating behavior in Off mode |
| SPLIT (Pin 24) | Bus common-mode stabilization | Drives termination midpoint to stabilize recessive bus level and reduce reflections |
| WBIAS (Pin 28) | Wake bias control | Provides bias current to external wake switches; sampling time set to 16 ms or 64 ms via WBC bit |
| VEXCTRL/VEXCC (Pins 31–29) | External PNP interface | VEXCTRL drives base; VEXCC monitors collector current - enables thermal load distribution across PCB |
| BAT (Pin 32) | Battery input | Accepts 4.5 V–27 V automotive battery range; protected per ISO 7637-3 transient standards |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CAN transceiver + dual regulators | Eliminates discrete BOM components while maintaining ISO 11898-2/5 compliance and independent V1/V2 supplies for EMC isolation |
| Configurable watchdog with on-chip oscillator | Enables functional safety monitoring without external timing components; window mode prevents premature or late resets |
| Programmable limp-home output | Provides hardware-level fail-safe activation path independent of MCU firmware state during overtemperature or critical faults |
| Low-power wake architecture | Supports <100 µA standby current with synchronized 16/64 ms wake sampling - extends battery life in always-on vehicle modules |
| Thermally optimized HTSSOP32 package | Exposed die pad reduces junction-to-board thermal resistance, enabling reliable operation at 125 °C ambient in engine bay applications |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time engine parameter monitoring and actuator control in gasoline/diesel powertrains under wide temperature and voltage ranges. IC Role / Device Role / Timing Role: Core SBC providing controlled MCU startup, CAN network interface, and fail-safe limp-home activation during sensor or software faults. Use Value: Ensures deterministic boot sequence and safe degradation via LIMP output, meeting ASIL-B functional safety requirements for throttle and ignition subsystems. | Use Scenario: Centralized management of door locks, lighting, HVAC, and window controls in modern vehicle architectures. IC Role / Device Role / Timing Role: Power and communication hub supplying 3.3 V MCU, enabling CAN messaging, and detecting wake events from mechanical switches or sensors. Use Value: Reduces component count vs. discrete solutions while supporting ultra-low standby current (<100 µA) for extended battery life in parked vehicles. |
| Advanced Driver Assistance Systems (ADAS) | Electric Power Steering (EPS) |
Use Scenario: Sensor fusion and camera/radar data aggregation in forward collision warning and lane departure systems. IC Role / Device Role / Timing Role: High-integrity CAN interface with ±58 V bus protection and precise 3.3 V regulation for image processing SoCs and microcontrollers. Use Value: Maintains CAN communication integrity during load dump transients (ISO 7637-2 Pulse 5a), preventing false alarms or missed detections. | Use Scenario: Torque assist control and motor feedback in steer-by-wire and column-assist EPS systems requiring high reliability. IC Role / Device Role / Timing Role: Safety-critical SBC delivering watchdog supervision, V1/V2 regulation, and hardware-initiated limp-home for mechanical fallback. Use Value: Enables ISO 26262 ASIL-C compliant design through independent watchdog clock source, overtemperature shutdown, and dedicated LIMP output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TJA1043TK/3V3/WD | Single-chip CAN transceiver with integrated 3.3 V regulator; lacks SPI interface, watchdog, and limp-home output | Targeted at simpler nodes where full SBC functionality is unnecessary; no system-level power management or diagnostics | Select when only basic CAN physical layer + regulator required; not suitable for complex ECU control or fail-safe needs |
| UJA1075TW/3V3/WD | Pin-compatible predecessor with identical 3.3 V regulator and watchdog; lacks SPLIT pin and updated CAN bus EMC performance | Legacy design-in with lower bus reflection suppression; same functional scope but older qualification and thermal specs | Choose UJA1076TW/3V3/WD:1 for new designs requiring improved CAN bus stability and extended thermal capability |
Compared with TJA1043TK/3V3/WD and UJA1075TW/3V3/WD, the UJA1076TW/3V3/WD:1 delivers superior system-level integration - including SPI-configurable diagnostics, SPLIT pin for recessive bus stabilization, and hardware limp-home - making it optimal for next-generation automotive ECUs demanding ASIL-compliant safety and robust EMC.
Availability
UJA1076TW/3V3/WD:1 is available at Aetrix Electronics and suitable for automotive engine control, body electronics, and ADAS applications requiring stable component supply, long lifecycle support, and AEC-Q100 qualified parts.
Supply support for UJA1076TW/3V3/WD:1 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-grade ICs and functional safety certification.
The UJA1076TW/3V3/WD:1 belongs to NXP's System Basis Chip product line, engineered specifically for automotive electronic control units to consolidate power management, CAN communication, and safety supervision into a single AEC-Q100 qualified device.
FAQ
What is the nominal output voltage and accuracy of the main regulator in UJA1076TW/3V3/WD:1?
The UJA1076TW/3V3/WD:1 features a 3.3 V main regulator (V1) with ±2 % output voltage accuracy across temperature and load. This precision enables reliable operation of 3.3 V microcontrollers and peripherals even during automotive cranking events down to VBAT = 4.5 V, as specified in ISO 16750-2. The UJA1076TW/3V3/WD:1 maintains this accuracy without external trimming components.
Does UJA1076TW/3V3/WD:1 support hardware-based fail-safe operation during overtemperature conditions?
Yes. When the UJA1076TW/3V3/WD:1 detects die temperature exceeding the OTP activation threshold, it enters Overtemp mode, driving RSTN LOW and asserting the LIMP pin LOW to activate external fail-safe hardware. This behavior is fully hardware-controlled and does not depend on MCU firmware execution, ensuring deterministic response during thermal faults. The UJA1076TW/3V3/WD:1 remains in this state until temperature drops below the hysteresis release threshold.
How is wake-up functionality implemented on UJA1076TW/3V3/WD:1, and what sampling options are available?
The UJA1076TW/3V3/WD:1 provides two dedicated local wake-up inputs (WAKE1 and WAKE2) with configurable sampling via the WBIAS pin and WBC bit in the Mode_Control register. Sampling time is selectable between 16 ms and 64 ms to balance responsiveness and current consumption. Wake events trigger interrupts and transition the SBC from Sleep or Standby mode. The UJA1076TW/3V3/WD:1 also supports CAN bus wake-up with Lowpower mode enabled.
What are the key differences between UJA1076TW/3V3/WD:1 and its predecessor UJA1075TW/3V3/WD?
The UJA1076TW/3V3/WD:1 improves upon the UJA1075TW/3V3/WD with enhanced CAN bus EMC performance, inclusion of the SPLIT pin for recessive bus level stabilization, updated thermal characteristics for higher ambient operation, and refined watchdog timing behavior. Both share pin compatibility and identical 3.3 V regulator specs, but the UJA1076TW/3V3/WD:1 is recommended for new designs requiring improved bus signal integrity and extended thermal margin.
Can UJA1076TW/3V3/WD:1 operate with an external PNP transistor, and how is current sharing controlled?
Yes. The UJA1076TW/3V3/WD:1 supports external PNP transistor extension of the V1 regulator using VEXCTRL (base drive) and VEXCC (collector current sense) pins. Current sharing is controlled via the PDC bit: when set, activation threshold is 50 mA rising / 15 mA falling; when cleared, it is 85 mA rising / 50 mA falling. This allows thermal load distribution across the PCB while maintaining tight 3.3 V regulation. The UJA1076TW/3V3/WD:1 monitors VEXCC to ensure safe transistor operation.
UJA1076TW/3V3/WD:1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- SPI Serial
- Voltage - Supply:
- 4.5V ~ 28V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1076TW/3V3/WD:1 FAQ
1.How can I place an order for UJA1076TW/3V3/WD:1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1076TW/3V3/WD:1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UJA1076TW/3V3/WD:1 reliable?
The price and inventory of UJA1076TW/3V3/WD:1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UJA1076TW/3V3/WD:1 is usually 5 days.
3.What payment methods are accepted for UJA1076TW/3V3/WD:1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1076TW/3V3/WD:1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1076TW/3V3/WD:1?
UJA1076TW/3V3/WD:1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1076TW/3V3/WD:1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UJA1076TW/3V3/WD:1?
For technical support, including UJA1076TW/3V3/WD:1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1076TW/3V3/WD:1 requirements.
6.How does Aetrix verify that UJA1076TW/3V3/WD:1 is sourced from the original manufacturer or authorized distributors?
All UJA1076TW/3V3/WD:1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UJA1076TW/3V3/WD:1 meets industry standards.
7.What is the process for return or replacement of UJA1076TW/3V3/WD:1?
All UJA1076TW/3V3/WD:1 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1076TW/3V3/WD:1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UJA1076TW/3V3/WD:1 part is unused and in its original packaging.
Return procedure for UJA1076TW/3V3/WD:1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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