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NXP Semiconductors UJA1078TW/5V0/WD:1
- Part No.:
- UJA1078TW/5V0/WD:1
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1078TW/5V0/WD:1.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
UJA1078TW/5V0/WD:1 from NXP Semiconductors is a core System Basis Chip (SBC) integrating a high-speed CAN transceiver (ISO 11898-2/5 compliant), two LIN 2.1 transceivers, a 5 V/250 mA microcontroller voltage regulator (V1), a dedicated 5 V CAN transceiver regulator (V2), and an advanced independent watchdog with window/timeout modes. It serves as the central power, communication, and safety controller in automotive ECUs - enabling controlled microcontroller startup, bus wake-up, and limp-home functionality in engine control modules.
For engineers reviewing the UJA1078TW/5V0/WD:1 datasheet, UJA1078TW/5V0/WD:1 pinout, UJA1078TW/5V0/WD:1 application, or UJA1078TW/5V0/WD:1 equivalent, this device delivers verified automotive-grade ECU integration - including ±58 V short-circuit protected CAN/LIN pins, ISO 7637-3 transient protection, 16-bit SPI configuration interface, and dual local wake-up inputs with bias control - for robust design-in of body control units and powertrain subsystems.
Technical Context
The UJA1078TW/5V0/WD:1 implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp mode transitions triggered by VBAT thresholds, wake events, or thermal conditions. Its dual-regulator architecture isolates V1 (5 V/250 mA for MCU) from V2 (5 V for CAN transceiver), ensuring EMC-stable bus operation even during cranking (VBAT ≥ 4.5 V for V1, ≥ 5.5 V for V2).
It features full-duplex 16-bit SPI with register-mapped diagnostics (WD_and_Status, Mode_Control, Int_Status), programmable watchdog with on-chip oscillator timing, and hardware-level bus wake-up detection on CAN, LIN1, LIN2, WAKE1, and WAKE2 - all coordinated via interrupt-driven status reporting to the host MCU.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CAN Interface | High-speed CAN transceiver compliant with ISO 11898-2 and ISO 11898-5; supports bus wake-up and SPLIT output for recessive level stabilization. |
| LIN Interfaces | Dual LIN transceivers compliant with LIN 2.1, SAE J2602, and backward-compatible with LIN 2.0/1.3; include low-slope mode and integrated termination diode at DLIN. |
| V1 Regulator | 5 V ±2 % (LIN master) / ±3 % (LIN slave) output; delivers up to 250 mA; supports external PNP transistor for thermal load sharing; operates down to VBAT = 4.5 V. |
| V2 Regulator | 5 V dedicated regulator for internal CAN transceiver; undervoltage warning at 90 % nominal; switchable off; operates down to VBAT = 5.5 V. |
| Watchdog | Independent on-chip oscillator–clocked watchdog with Window, Timeout, and Off modes; programmable period (8 ms to 4096 ms); WDOFF pin disables watchdog and triggers software reset. |
| SPI Interface | Full-duplex 16-bit SPI with SCSN/SCK/SDI/SDO; register-addressed access (A2–A0); read-only option; supports status feedback during write operations. |
| Package | HTSSOP32 (SOT549-1): 6.1 mm × 11 mm, 0.65 mm pitch, exposed die pad for PCB thermal dissipation; RoHS and dark green compliant. |
Pinout & Package
UJA1078TW/5V0/WD:1 uses the HTSSOP32 (SOT549-1) package: 32-pin thermally enhanced thin shrink small outline package with 6.1 mm body width, 0.65 mm lead pitch, and exposed die pad for PCB heat conduction. The die pad is electrically isolated and may be left floating or connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TXDL2 (1) | LIN2 transmit data input | Drives LIN2 bus via internal driver; logic-level input synchronized to SPI-controlled LIN physical layer. |
| RXDL2 (2) | LIN2 receive data output | Provides LIN2 bus signal to MCU; includes wake-up flag visibility during standby/sleep modes. |
| V1 (4) | Main regulator output | 5 V supply for MCU and peripherals; supports external PNP current boost via VEXCTRL/VEXCC pins. |
| RSTN (6) | Bidirectional reset I/O | Active-low reset signal with programmable pulse length; supports variable POR timing for diverse MCU families. |
| INTN (7) | Interrupt output | Open-drain interrupt signal indicating V1/V2 undervoltage, CAN/LIN/wake events, or cyclic interrupts. |
| WDOFF (16) | Watchdog disable input | Hardware-disable pin: HIGH forces watchdog off and initiates software reset; overrides register settings. |
| LIMP (17) | Limp home output | Active-low output activated during overtemperature or critical failure; enables fail-safe hardware activation. |
| WAKE1/WAKE2 (18/19) | Local wake-up inputs | Configurable edge-sensitive inputs with WBIAS bias control and selectable 16 ms/64 ms sampling windows. |
| V2 (20) | CAN transceiver regulator | Dedicated 5 V supply for internal CAN PHY; electrically isolated from V1 to prevent EMC coupling. |
| CANH/CANL (21/22) | CAN bus differential pair | High-speed CAN physical layer interface; ±58 V short-circuit tolerant; floating when powered off. |
| SPLIT (24) | CAN common-mode stabilization | Output used to stabilize recessive bus level via external 47 kΩ resistor to VCAN; improves signal integrity. |
| DLIN (26) | LIN termination diode node | Internal connection point for LIN bus termination diode; simplifies external LIN network design. |
| WBIAS (28) | Wake bias control output | Drives external bias transistor for WAKE1/WAKE2; sampling time set via Mode_Control register bit WBC. |
| VEXCTRL (31) | External PNP base control | Drives base of external PNP transistor to extend V1 current capability beyond 250 mA. |
| BAT (32) | Battery supply input | Primary power input (VBAT); supports ISO 7637-3 transient protection and cranking operation down to 4.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-bus networking | Single-chip replacement for discrete CAN + dual-LIN transceivers, eliminating 3+ ICs and reducing BOM count and layout area in ECU designs. |
| Automotive-grade protection | ±8 kV HBM / ±6 kV IEC 61000-4-2 ESD on CAN/LIN/WAKE pins; ±58 V short-circuit tolerance; ISO 7637-3 transient immunity on BAT/CAN/LIN. |
| Thermally optimized power delivery | V1 regulator with external PNP support (via VEXCTRL/VEXCC) enables scalable current delivery while distributing heat across PCB copper. |
| Fail-safe system management | Overtemperature shutdown with LIMP output activation, configurable watchdog with window mode, and bidirectional RSTN with programmable POR timing. |
| Low-power wake architecture | Three-tier power states (Standby/Sleep/Off) with selective bus transceiver enable/disable and wake-source detection on CAN, LIN, and local inputs. |
Applications
| Engine Control Module (ECM) | Body Control Module (BCM) |
|---|---|
Use Scenario: Central ECU managing fuel injection, ignition timing, and OBD-II diagnostics in gasoline/diesel powertrains. IC Role / Device Role / Timing Role: Core SBC provides regulated 5 V power to MCU, interfaces with CAN backbone for ECU-to-ECU communication, and manages LIN sub-buses for throttle position, knock sensor, and camshaft actuator nodes. Use Value: Enables deterministic startup sequencing, bus-initiated wake-up during cranking, and limp-home activation upon thermal fault - meeting ASIL-B functional safety requirements. | Use Scenario: Integrated vehicle body controller coordinating door locks, lighting, HVAC, and seat/mirror positioning. IC Role / Device Role / Timing Role: Acts as power and communication hub: V1 powers body MCU; dual LIN interfaces manage distributed sensors/actuators; CAN connects to gateway for infotainment and ADAS domains. Use Value: Reduces component count vs. discrete solutions; supports remote flash programming over CAN; delivers stable 5 V under battery dip conditions (ISO 16750-2 Pulse 4b). |
| Transmission Control Unit (TCU) | Advanced Driver Assistance Systems (ADAS) Sensor Hub |
Use Scenario: Real-time gear-shifting control unit interfacing with engine ECU, wheel speed sensors, and solenoid valves. IC Role / Device Role / Timing Role: Provides fault-tolerant power (V1/V2), high-speed CAN for torque coordination, and LIN for valve position feedback; monitors thermal margin via on-die temperature sensing. Use Value: Ensures uninterrupted CAN communication during transmission shifts; supports cyclic wake-up for periodic sensor polling; meets AEC-Q100 Grade 1 reliability. | Use Scenario: Central aggregation node for radar, camera, and ultrasonic sensors in parking assist or blind-spot detection systems. IC Role / Device Role / Timing Role: Supplies 5 V to vision/MCU subsystems; routes CAN messages to domain controller; uses LIN interfaces for low-bandwidth sensor calibration and status reporting. Use Value: Eliminates need for separate CAN/LIN transceivers and LDOs; enables synchronized wake-up of multiple sensors via LIN broadcast; supports diagnostic logging via SPI-accessible status registers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar core SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UJA1076TW/5V0/WD | Single-LIN variant (1 LIN transceiver vs. 2); identical CAN, V1/V2 regulators, watchdog, and HTSSOP32 package. | Targeted at cost-sensitive ECUs where only one LIN sub-bus is required (e.g., simple lighting control). | Select UJA1076TW/5V0/WD when dual-LIN is unnecessary; retains same footprint, SPI interface, and diagnostic register map. |
| TJA1043TK/3 | Standalone high-speed CAN transceiver (no LIN, no regulators, no watchdog); ISO 11898-2/5 compliant; SO14 package. | Used only for CAN physical layer extension where power management and secondary buses are handled externally. | Choose TJA1043TK/3 only if full SBC integration is not needed; requires external LDOs, LIN transceivers, and watchdog circuitry. |
Compared with UJA1078TW/5V0/WD:1, UJA1076TW/5V0/WD reduces LIN channel count but maintains full compatibility in power, CAN, and diagnostics - while TJA1043TK/3 offers CAN-only functionality in a smaller package but demands complete external system integration.
Availability
UJA1078TW/5V0/WD:1 is available at Aetrix Electronics and suitable for automotive engine control modules, body control units, transmission control units, and ADAS sensor hubs requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified parts.
Supply support for UJA1078TW/5V0/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 applications, with deep expertise in automotive-grade analog and mixed-signal ICs.
The UJA1078TW/5V0/WD:1 belongs to NXP's System Basis Chip product line, designed specifically to consolidate power regulation, high-speed CAN, dual-LIN, and safety monitoring into a single AEC-Q100 qualified device for next-generation automotive ECUs.
FAQ
What is the primary function of the UJA1078TW/5V0/WD:1 in an automotive ECU?
The UJA1078TW/5V0/WD:1 serves as a core System Basis Chip that integrates power management (5 V/250 mA V1 regulator + dedicated 5 V V2 for CAN), high-speed CAN and dual-LIN physical layers, an advanced watchdog, and system supervision logic. In an automotive ECU, the UJA1078TW/5V0/WD:1 ensures controlled MCU startup, bus-initiated wake-up, fault detection, and limp-home activation - replacing multiple discrete components while meeting ISO 11898, LIN 2.1, and AEC-Q100 requirements.
Does the UJA1078TW/5V0/WD:1 support both 3.3 V and 5 V microcontroller supplies?
No - the UJA1078TW/5V0/WD:1 is the 5 V version of the device, delivering a nominal 5 V ±2 % (for LIN master) or ±3 % (for LIN slave) output from its V1 regulator. The 3.3 V variant is designated UJA1078TW/3V3/WD. The "5V0" suffix in UJA1078TW/5V0/WD:1 explicitly denotes the 5 V regulator output; mixing voltage versions risks MCU damage or unstable operation.
How does the watchdog in the UJA1078TW/5V0/WD:1 differ from basic timeout watchdogs?
The UJA1078TW/5V0/WD:1 watchdog features three distinct operating modes - Window, Timeout, and Off - all clocked by an independent on-chip oscillator. In Window mode, it enforces strict timing boundaries: triggering too early (first half of period) or too late (overflow) causes immediate reset. This prevents both premature and delayed servicing - a critical requirement for ASIL-B systems. The UJA1078TW/5V0/WD:1 also supports cyclic wake-up interrupts and hardware disable via the WDOFF pin, offering greater flexibility than basic timeout-only watchdogs.
Can the UJA1078TW/5V0/WD:1 operate during automotive battery cranking events?
Yes - the UJA1078TW/5V0/WD:1 is designed for cranking resilience. Its V1 regulator operates down to VBAT = 4.5 V (per ISO 7637 Pulse 4/4b and ISO 16750-2), maintaining stable 5 V output to the MCU during engine start. The V2 regulator sustains CAN transceiver operation down to VBAT = 5.5 V. Both regulators include undervoltage detection and reset functions, ensuring safe MCU behavior even under severe battery dip conditions encountered in 12 V automotive systems.
What is the purpose of the SPLIT pin on the UJA1078TW/5V0/WD:1?
The SPLIT pin on the UJA1078TW/5V0/WD:1 outputs a stabilized common-mode voltage used to bias an external 47 kΩ resistor connected between SPLIT and the CAN bus (typically at the center of the termination network). This actively stabilizes the recessive (dominant-idle) bus level, reducing ringing and improving signal integrity - especially in longer or unterminated CAN networks. It is a key feature for achieving robust EMC performance in noisy automotive environments.
UJA1078TW/5V0/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:
- CAN, LIN
- Voltage - Supply:
- 4.5V ~ 28V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1078TW/5V0/WD:1 FAQ
1.How can I place an order for UJA1078TW/5V0/WD:1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1078TW/5V0/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 UJA1078TW/5V0/WD:1 reliable?
The price and inventory of UJA1078TW/5V0/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 UJA1078TW/5V0/WD:1 is usually 5 days.
3.What payment methods are accepted for UJA1078TW/5V0/WD:1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1078TW/5V0/WD:1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1078TW/5V0/WD:1?
UJA1078TW/5V0/WD:1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1078TW/5V0/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 UJA1078TW/5V0/WD:1?
For technical support, including UJA1078TW/5V0/WD:1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1078TW/5V0/WD:1 requirements.
6.How does Aetrix verify that UJA1078TW/5V0/WD:1 is sourced from the original manufacturer or authorized distributors?
All UJA1078TW/5V0/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 UJA1078TW/5V0/WD:1 meets industry standards.
7.What is the process for return or replacement of UJA1078TW/5V0/WD:1?
All UJA1078TW/5V0/WD:1 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1078TW/5V0/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 UJA1078TW/5V0/WD:1 part is unused and in its original packaging.
Return procedure for UJA1078TW/5V0/WD:1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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