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NXP Semiconductors UJA1078ATW/3V3WD,1
- Part No.:
- UJA1078ATW/3V3WD,1
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1078ATW/3V3WD,1.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,742
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Product details
Overview
UJA1078ATW/3V3WD,1 from NXP Semiconductors is a high-speed CAN/dual LIN core System Basis Chip (SBC) integrating a 3.3 V/250 mA microcontroller regulator, dedicated 5 V CAN transceiver regulator, ISO 11898-2/5-compliant HS-CAN transceiver, two LIN 2.2A transceivers, SPI interface, advanced watchdog, and limp home output - deployed in automotive ECUs for powertrain and body control modules.
For engineers reviewing the UJA1078ATW/3V3WD,1 datasheet, UJA1078ATW/3V3WD,1 pinout, UJA1078ATW/3V3WD,1 application, or UJA1078ATW/3V3WD,1 equivalent, key selection considerations include 3.3 V V1 regulator accuracy (±2 %), dual-LIN wake-up capability, CAN/LIN bus short-circuit robustness (±58 V), thermal shutdown behavior, and SPI-configurable watchdog timing with window mode support.
Technical Context
The UJA1078ATW/3V3WD,1 implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp modes with deterministic transitions triggered by VBAT thresholds, wake events, or register writes. Its SPI interface operates full-duplex with register-mapped diagnostics (WD_and_Status, Mode_Control, Int_Status) and supports read-only access to preserve configuration during status reads.
Power management includes independent V1 (3.3 V, ±2 %, 250 mA) and V2 (5 V) regulators, both operational down to 4.5 V (V1) or 5.5 V (V2) during cranking per ISO 7637; V1 supports external PNP extension with programmable current thresholds (50/85 mA activation/deactivation); V2 can be disabled to reduce quiescent current in Normal mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Output Voltage | 3.3 V ±2 % - supplies microcontroller and peripherals with stable voltage under cranking (VBAT ≥ 4.5 V) |
| V1 Max Current | 250 mA - extendable via external PNP transistor with selectable activation threshold (50 mA or 85 mA) |
| CAN Compliance | ISO 11898-2:2003 & ISO 11898-5:2006 - interoperable with TJA1042; supports bus floating when powered off |
| LIN Compliance | 2 × LIN 2.2A + SAE J2602 - backward compatible to LIN 1.0; low-slope mode for EMC optimization |
| Watchdog Modes | Window, Timeout, Off - clocked by on-chip oscillator; default period 128 ms; configurable via NWP bits |
| ESD Protection | ±8 kV HBM, ±6 kV IEC 61000-4-2 on CAN/LIN/wake pins - meets automotive EMC requirements |
| Bus Fault Tolerance | ±58 V short-circuit proof on CAN/LIN pins - enables robust operation in noisy vehicle environments |
Pinout & Package
UJA1078ATW/3V3WD,1 uses a 32-pin HTSSOP package (6.1 mm × 11 mm, 0.65 mm pitch) with exposed thermal pad for enhanced heat dissipation and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Main microcontroller supply output | 3.3 V regulated output (±2 %), 250 mA max; connects to MCU VCC and decoupling caps |
| V2 | Dedicated CAN transceiver supply | 5 V regulated output; can be disabled to reduce current in Normal mode |
| RXDC / TXDC | CAN data interface | Connects to MCU's CAN controller RX/TX pins; full-duplex SPI-controlled link |
| RXDL1 / TXDL1 RXDL2 / TXDL2 | Dual LIN data interfaces | Independent LIN1/LIN2 data paths to MCU UART or LIN controller peripherals |
| CANH / CANL | High-speed CAN bus interface | Direct connection to vehicle CAN bus; ±58 V fault tolerant; SPLIT pin stabilizes recessive level |
| LIN1 / LIN2 / DLIN | LIN bus physical layer | LIN1/LIN2 bidirectional bus lines; DLIN provides integrated termination diode connection point |
| WAKE1 / WAKE2 | Local wake-up inputs | Analog inputs detecting switch closures or sensor signals; configurable sampling (16/64 ms) via WBIAS |
| LIMP | Limp home activation output | Active-low open-drain output driving safety-critical hardware during Overtemp or severe fault |
| SPI Pins (SDI/SDO/SCK/SCSN) | Microcontroller communication | Full-duplex SPI interface for configuration, status reporting, and interrupt handling |
| RSTN | Bidirectional reset | Drives LOW during power-on, overtemperature, or watchdog timeout; accepts external reset pulses |
| INTN | Interrupt notification | Open-drain output signaling V1/V2 undervoltage, wake events, cyclic interrupts, or power-on |
| WDOFF | Watchdog disable control | Hardware override: HIGH disables watchdog and triggers software reset |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-LIN + HS-CAN transceivers | Reduces BOM count by replacing 3 discrete transceivers and associated protection components |
| Programmable watchdog with window mode | Enables fail-safe MCU supervision with precise timing windows to detect firmware hangs or timing violations |
| V1 regulator with external PNP extension | Allows scalable current delivery up to >1 A while distributing thermal load across PCB for improved reliability |
| Multi-source wake-up capability | Supports concurrent wake from CAN bus activity, LIN bus activity, or two local inputs - critical for low-power ECU sleep states |
| LIMP output with overtemperature linkage | Automatically activates safety hardware (e.g., mechanical valve hold-open) during thermal shutdown without MCU intervention |
Applications
| Body Control Module (BCM) | Powertrain Control Unit (PCU) |
|---|---|
Use Scenario: Centralized control of door locks, lighting, wipers, and HVAC actuators in modern vehicles. IC Role / Device Role / Timing Role: Core SBC providing regulated 3.3 V power to BCM MCU, HS-CAN gateway to main vehicle network, and dual-LIN sub-buses for low-cost sensor/actuator clusters. Use Value: Enables single-chip integration of power, communication, and safety functions - reducing board space and improving startup predictability during cold cranking. | Use Scenario: Engine or transmission ECU requiring robust communication with sensors, actuators, and diagnostic tools. IC Role / Device Role / Timing Role: Supplies 3.3 V to powertrain MCU, isolates CAN bus with dedicated V2-regulated transceiver, and manages wake-up from OBD-II or LIN-connected throttle position sensors. Use Value: Maintains CAN/LIN communication integrity under ±58 V bus faults and ISO 7637-3 transients - ensuring diagnostic availability during engine start-stop cycles. |
| Advanced Driver Assistance Systems (ADAS) Sensor Hub | Electric Vehicle (EV) Battery Management Interface |
Use Scenario: Aggregation node for radar, camera, and ultrasonic sensors communicating over LIN and CAN. IC Role / Device Role / Timing Role: Provides low-noise 3.3 V supply to imaging processors, dual-LIN interfaces for sensor calibration, and HS-CAN link to ADAS domain controller. Use Value: Low-slope LIN mode and dedicated CAN regulator minimize electromagnetic interference affecting sensitive analog sensor signals. | Use Scenario: Communication bridge between battery pack sensors (LIN) and vehicle CAN network in EV battery packs. IC Role / Device Role / Timing Role: Powers BMS microcontroller via V1, interfaces with cell monitoring ICs over LIN2, and relays SOC/SOH data via HS-CAN to vehicle gateway. Use Value: LIMP output triggers safe discharge path activation during thermal runaway detection - enabling hardware-level response before software fails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar core SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UJA1076ATW/3V3WD,1 | Single-LIN variant; lacks second LIN transceiver and DLIN pin; identical V1/V2 regulators and CAN functionality | Suitable only where one LIN sub-bus suffices (e.g., simpler body modules); not drop-in for dual-LIN designs | Select UJA1076ATW/3V3WD,1 only if LIN2 is unused and board layout allows pin count reduction |
| TJA1128BK/3V3/1 | Includes integrated CAN FD transceiver and Ethernet PHY; no LIN; higher integration but larger QFN48 package | Targets next-gen gateways requiring CAN FD and Ethernet; incompatible pinout and software stack | Choose TJA1128BK/3V3/1 only when upgrading to CAN FD/Ethernet architecture - not a functional substitute for LIN-dependent systems |
Compared with UJA1078ATW/3V3WD,1, UJA1076ATW/3V3WD,1 reduces cost and footprint where dual-LIN is unnecessary, while TJA1128BK/3V3/1 shifts architecture toward CAN FD/Ethernet - neither offers pin-compatible replacement nor preserves LIN2 functionality required by the original design.
Availability
UJA1078ATW/3V3WD,1 is available at Aetrix Electronics and suitable for automotive body control, powertrain, ADAS sensor hub, and EV battery interface applications requiring stable component supply, AEC-Q100 qualification, and long-term automotive lifecycle support.
Supply support for UJA1078ATW/3V3WD,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 company specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with leadership in automotive MCUs, SBCs, and radar technology.
The UJA1078ATW/3V3WD,1 belongs to NXP's core System Basis Chip product line, designed specifically for automotive ECU consolidation - integrating power, communication, and safety functions into a single AEC-Q100 qualified device for body, powertrain, and chassis applications.
FAQ
What is the nominal output voltage and accuracy of the V1 regulator in UJA1078ATW/3V3WD,1?
The V1 regulator in UJA1078ATW/3V3WD,1 delivers a nominal 3.3 V output with ±2 % accuracy across temperature and load conditions. This tight tolerance ensures reliable operation of connected microcontrollers and peripherals, especially during battery cranking events where VBAT drops to 4.5 V - a requirement validated per ISO 16750-2. The UJA1078ATW/3V3WD,1 maintains regulation stability even under transient load steps due to internal compensation and external capacitor support.
Does UJA1078ATW/3V3WD,1 support both LIN 2.2A and legacy LIN versions?
Yes, UJA1078ATW/3V3WD,1 supports LIN 2.2A and is fully backward compatible with LIN 2.2, LIN 2.1, LIN 2.0, LIN 1.3, LIN 1.2, LIN 1.1, and LIN 1.0. Its dual LIN transceivers comply with SAE J2602 and include low-slope mode for optimized EMC performance - making UJA1078ATW/3V3WD,1 suitable for mixed-generation LIN networks in vehicles undergoing platform evolution.
How does the watchdog function in UJA1078ATW/3V3WD,1 differ from basic timeout watchdogs?
The UJA1078ATW/3V3WD,1 implements a programmable watchdog with three distinct modes: Window, Timeout, and Off. In Window mode, the watchdog requires a trigger within a defined time window - not just before timeout - preventing premature or late resets caused by timing jitter. This feature, combined with an on-chip oscillator independent of V1/V2, ensures deterministic supervision of MCU firmware execution. The UJA1078ATW/3V3WD,1 watchdog defaults to 128 ms and is configurable via NWP bits in the WD_and_Status register.
Can UJA1078ATW/3V3WD,1 operate during automotive battery cranking conditions?
Yes, UJA1078ATW/3V3WD,1 is designed to remain functional during cranking: its V1 regulator operates down to VBAT = 4.5 V and V2 down to 5.5 V, complying with ISO 7637-2 pulse 4 and ISO 16750-2 cold-cranking profiles. Both regulators maintain stable output and enable wake-up detection, allowing the ECU to retain communication readiness and respond to CAN/LIN messages even under severe voltage sag - a critical capability confirmed in UJA1078ATW/3V3WD,1 automotive qualification testing.
What is the purpose and behavior of the LIMP output in UJA1078ATW/3V3WD,1?
The LIMP output in UJA1078ATW/3V3WD,1 is an active-low, open-drain signal that drives external safety hardware (e.g., mechanical valve latches or relay drivers) during critical failures. It activates automatically upon entry into Overtemp mode or when the limp home control bit (LHC) is set via SPI. Unlike software-triggered outputs, LIMP asserts independently of MCU operation - ensuring fail-operational behavior. The UJA1078ATW/3V3WD,1 guarantees LIMP activation within 10 µs of overtemperature detection, providing hardware-level response before thermal damage occurs.
UJA1078ATW/3V3WD,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:
- Not For New Designs
- Applications:
- -
- Interface:
- CAN, LIN
- Voltage - Supply:
- 4.5V ~ 28V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1078ATW/3V3WD,1 FAQ
1.How can I place an order for UJA1078ATW/3V3WD,1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1078ATW/3V3WD,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 UJA1078ATW/3V3WD,1 reliable?
The price and inventory of UJA1078ATW/3V3WD,1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UJA1078ATW/3V3WD,1 is usually 5 days.
3.What payment methods are accepted for UJA1078ATW/3V3WD,1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1078ATW/3V3WD,1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1078ATW/3V3WD,1?
UJA1078ATW/3V3WD,1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1078ATW/3V3WD,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 UJA1078ATW/3V3WD,1?
For technical support, including UJA1078ATW/3V3WD,1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1078ATW/3V3WD,1 requirements.
6.How does Aetrix verify that UJA1078ATW/3V3WD,1 is sourced from the original manufacturer or authorized distributors?
All UJA1078ATW/3V3WD,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 UJA1078ATW/3V3WD,1 meets industry standards.
7.What is the process for return or replacement of UJA1078ATW/3V3WD,1?
All UJA1078ATW/3V3WD,1 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1078ATW/3V3WD,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 UJA1078ATW/3V3WD,1 part is unused and in its original packaging.
Return procedure for UJA1078ATW/3V3WD,1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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