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NXP Semiconductors UJA1079TW/5V0,112
- Part No.:
- UJA1079TW/5V0,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1079TW/5V0,112.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,991
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Product details
Overview
UJA1079TW/5V0,112 from NXP Semiconductors is a LIN 2.1–compliant System Basis Chip (SBC) integrating a 5 V/250 mA voltage regulator, LIN transceiver, advanced watchdog, SPI interface, dual local wake-up inputs, and limp-home output - designed for automotive ECU power management and communication control in body electronics and sensor nodes.
For engineers reviewing the UJA1079TW/5V0,112 datasheet, UJA1079TW/5V0,112 pinout, UJA1079TW/5V0,112 application, or UJA1079TW/5V0,112 equivalent, this page delivers verified functional roles, HTSSOP32 package mapping, LIN bus protection specs (±58 V short-circuit, ±8 kV HBM), regulator accuracy (±2 % for master mode), and wake-up source detection behavior critical for automotive ECU design validation.
Technical Context
The UJA1079TW/5V0,112 implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp modes with deterministic transitions triggered by VBAT thresholds, LIN activity, or local wake events. Its LIN transceiver supports low-slope mode (10.4 kbit/s) for EMC optimization and includes integrated termination diode at DLIN.
Power management combines V1 regulation (5 V ±2 %), external PNP transistor support with programmable activation thresholds (50/85 mA), and dual wake biasing (WBIAS) with selectable 16 ms or 64 ms sampling. The watchdog uses an independent on-chip oscillator and supports Window/Timeout/Off modes via WMC bit and WDOFF pin control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LIN Compliance | LIN 2.1, SAE J2602, backward-compatible with LIN 2.0 and LIN 1.3 - ensures interoperability across legacy and modern automotive sub-bus networks. |
| Voltage Regulator (V1) | 5 V output, ±2 % accuracy in LIN master mode, 250 mA max continuous current - powers microcontroller and peripherals without external LDO in most body control modules. |
| ESD Protection | ±8 kV HBM on LIN and wake pins, ±6 kV IEC 61000-4-2 - meets automotive EMC requirements for harsh vehicle environments. |
| Short-Circuit Tolerance | ±58 V on LIN bus pin - survives load-dump and jump-start transients per ISO 7637-3 without external clamping. |
| Watchdog Modes | Window, Timeout, and Off modes with programmable period (8–4096 ms); independent on-chip oscillator - enables fail-safe timing supervision independent of MCU clock stability. |
| SPI Interface | 16-bit full-duplex SPI with read-only register access - allows real-time status reporting (e.g., wake source, V1 undervoltage, overtemperature) without corrupting configuration registers. |
| Thermal Package | HTSSOP32 (SOT549-1), 6.1 mm × 11 mm, exposed die pad - provides low thermal resistance for sustained 250 mA operation in compact ECU layouts. |
Pinout & Package
UJA1079TW/5V0,112 is housed in a 32-pin HTSSOP (SOT549-1) package with 0.65 mm pitch and exposed thermal pad. The package supports PCB-level heat dissipation and complies with RoHS and dark green standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 4) | Regulated output supply | 5 V ±2 % output powering MCU core and peripherals; supports external PNP extension for >250 mA loads with distributed thermal handling. |
| LIN (Pin 25) | LIN bus line interface | Direct connection to LIN physical bus; internally protected against ±58 V shorts and ±8 kV ESD - eliminates need for discrete TVS on bus line. |
| RSTN (Pin 6) | Bidirectional reset I/O | Drives LOW during internal resets (V1 UV, watchdog overflow, overtemp); accepts external LOW pulse for forced system reset - enables coordinated ECU power sequencing. |
| WAKE1 / WAKE2 (Pins 18, 19) | Local wake-up inputs | Detect switch closures or sensor signals; support configurable edge-triggered interrupts and synchronized sampling via WBIAS - reduces standby current in always-on sensor nodes. |
| LIMP (Pin 17) | Limp-home control output | Drives LOW during overtemperature or critical fault to activate fail-safe hardware (e.g., mechanical valve hold-open) - provides ASIL-B–aligned safety response without MCU involvement. |
| WDOFF (Pin 16) | Watchdog disable control | Hardware-disable input: HIGH forces watchdog OFF regardless of register settings - enables safe debug mode or MCU-initiated watchdog suspension. |
| VEXCTRL / VEXCC (Pins 31, 29) | External PNP control | VEXCTRL drives base of external PNP; VEXCC measures collector current - enables precise current-sharing control between internal regulator and external transistor. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced low-power concept | Standby current < 100 µA and Sleep current < 20 µA with full wake-up capability - extends battery life in always-on automotive modules (e.g., door modules, seat controllers). |
| Safe system start-up | Controlled power-on reset with programmable pulse width and VBAT threshold detection (Vth(det)pon) - prevents MCU lock-up during cranking (VBAT ≥ 4.5 V per ISO 16750-2). |
| Detailed status reporting | Register-mapped diagnostics including V1S (undervoltage), WLS1/WLS2 (wake source), and INT_STATUS bits - enables root-cause analysis of wake events and power faults without oscilloscope probing. |
| Integrated LIN termination | On-chip diode at DLIN (Pin 26) - eliminates one external component and ensures consistent bus termination impedance across temperature and voltage. |
| Fail-safe enable output | EN (Pin 8) driven HIGH only in Normal mode when ENC = 1 - prevents unintended activation of safety-critical actuators during boot or fault states. |
Applications
| Body Control Module (BCM) | Seat Position Control Unit |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, mirrors, and interior lighting via LIN sub-network. IC Role / Device Role / Timing Role: UJA1079TW/5V0,112 serves as primary power manager and LIN interface - regulating 5 V for MCU, enabling bus wake-up from sleep, and asserting LIMP during thermal fault. Use Value: Reduces BOM count by replacing discrete LDO, LIN transceiver, watchdog, and reset supervisor; supports cranking operation down to 4.5 V. | Use Scenario: Motorized seat adjustment with position feedback, memory presets, and occupant detection. IC Role / Device Role / Timing Role: UJA1079TW/5V0,112 supplies regulated 5 V to MCU and motor driver logic, detects local wake from seat switch closure, and triggers limp-home output if motor stall causes overtemperature. Use Value: Enables ultra-low standby current (<20 µA) while maintaining instant wake-up; integrated watchdog prevents runaway motor control due to software hang. |
| Roof Module (Sunroof/Climate) | Trunk/Liftgate Actuator |
Use Scenario: LIN-connected sunroof controller with rain sensor integration and anti-pinch safety logic. IC Role / Device Role / Timing Role: UJA1079TW/5V0,112 manages power sequencing, monitors LIN bus for master commands, and asserts LIMP to hold sunroof in last-safe position during MCU failure. Use Value: ±58 V LIN bus tolerance withstands jump-start transients; low-slope LIN mode minimizes radiated emissions near sensitive RF receivers. | Use Scenario: Power-operated liftgate with obstacle detection, soft-close, and hands-free kick-sensor interface. IC Role / Device Role / Timing Role: UJA1079TW/5V0,112 regulates 5 V for MCU and sensor interface, wakes system on kick-sensor signal via WAKE2, and disables EN output during overtemperature shutdown. Use Value: Dual wake inputs allow independent sensing of kick event and obstruction; V1 undervoltage warning (90 % threshold) enables graceful shutdown before brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LIN SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UJA1076TW/5V0,112 | No integrated watchdog; lacks WDOFF pin and WD_and_Status register - reduced functional safety coverage. | Suitable for cost-sensitive LIN slave nodes where watchdog supervision is handled externally or omitted. | Select UJA1076TW/5V0,112 only when watchdog independence is not required and BOM cost reduction outweighs diagnostic depth. |
| TLE9183QK | Includes CAN FD interface alongside LIN; higher V1 current (300 mA); different pinout and SPI register map - not pin-compatible. | Targeted at mixed-protocol ECUs requiring both LIN and CAN FD connectivity in same housing. | Choose TLE9183QK when dual-bus architecture is needed; migration requires PCB layout and firmware changes. |
Compared with UJA1076TW/5V0,112, the UJA1079TW/5V0,112 adds watchdog autonomy and deeper fault reporting; versus TLE9183QK, it offers simpler integration and lower cost for LIN-only systems but lacks CAN FD capability and higher current delivery.
Availability
UJA1079TW/5V0,112 is available at Aetrix Electronics and suitable for automotive body electronics, seat control units, roof modules, and trunk/liftgate actuators requiring stable component supply, long-term lifecycle support, and AEC-Q100–aligned reliability.
Supply support for UJA1079TW/5V0,112 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 focused on automotive, industrial, and IoT applications, delivering secure, energy-efficient, and scalable silicon solutions.
The UJA1079TW/5V0,112 belongs to NXP's System Basis Chip family, engineered specifically for automotive ECU consolidation - integrating LIN communication, power regulation, and safety monitoring into a single robust package for body electronics and sensor node applications.
FAQ
What LIN protocol versions does the UJA1079TW/5V0,112 support?
The UJA1079TW/5V0,112 supports LIN 2.1 and SAE J2602 as primary compliance targets, and maintains backward compatibility with LIN 2.0 and LIN 1.3. This ensures interoperability across generations of automotive LIN masters and slaves without firmware modification. The transceiver also features low-slope mode for optimized EMC performance in electrically noisy vehicle environments.
Does the UJA1079TW/5V0,112 include a watchdog, and how is it configured?
Yes, the UJA1079TW/5V0,112 includes an advanced independent watchdog clocked by an on-chip oscillator. It supports Window, Timeout, and Off modes controlled via the WMC bit in the WD_and_Status register and the WDOFF pin. The nominal period is programmable from 8 ms to 4096 ms using the NWP bits. Configuration occurs over SPI, and hardware disable via WDOFF takes precedence over register settings.
What is the purpose of the LIMP pin on the UJA1079TW/5V0,112?
The LIMP pin on the UJA1079TW/5V0,112 is a fail-safe output that drives LOW during critical system faults - specifically overtemperature events or when the limp home warning control bit (LHWC) is set and followed by reset. It directly activates application-specific hardware (e.g., solenoid hold-open circuits) without MCU intervention, fulfilling functional safety requirements for ASIL-B–level responses in automotive systems.
Can the UJA1079TW/5V0,112 operate during engine cranking conditions?
Yes, the UJA1079TW/5V0,112 is specified to operate with battery input (BAT) down to 4.5 V, meeting ISO 16750-2 and ISO 7637-3 pulse 4/4b requirements for engine cranking. Its V1 regulator maintains stable 5 V ±2 % output under these conditions, and the system controller executes controlled reset sequences to prevent MCU malfunction during transient brownouts.
How does the UJA1079TW/5V0,112 manage thermal dissipation at 250 mA output current?
The UJA1079TW/5V0,112 uses an HTSSOP32 package with an exposed die pad to enhance thermal conduction into the PCB. For sustained 250 mA operation, it supports extension with an external PNP transistor controlled via VEXCTRL/VEXCC pins - enabling current sharing and distributed heat dissipation across the board, thereby avoiding localized hot spots and improving long-term reliability.
UJA1079TW/5V0,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- SPI Serial
- Voltage - Supply:
- 4.5V ~ 28V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1079TW/5V0,112 FAQ
1.How can I place an order for UJA1079TW/5V0,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1079TW/5V0,112 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 UJA1079TW/5V0,112 reliable?
The price and inventory of UJA1079TW/5V0,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UJA1079TW/5V0,112 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1079TW/5V0,112 transactions.
Note: Certain payment methods may incur a processing fee.
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UJA1079TW/5V0,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1079TW/5V0,112 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 UJA1079TW/5V0,112?
For technical support, including UJA1079TW/5V0,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1079TW/5V0,112 requirements.
6.How does Aetrix verify that UJA1079TW/5V0,112 is sourced from the original manufacturer or authorized distributors?
All UJA1079TW/5V0,112 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 UJA1079TW/5V0,112 meets industry standards.
7.What is the process for return or replacement of UJA1079TW/5V0,112?
All UJA1079TW/5V0,112 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1079TW/5V0,112, 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 UJA1079TW/5V0,112 part is unused and in its original packaging.
Return procedure for UJA1079TW/5V0,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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