My Inquiry
My Account
NXP Semiconductors UJA1079TW/3V3,118
- Part No.:
- UJA1079TW/3V3,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1079TW/3V3,118.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,589
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The UJA1079TW/3V3,118 from NXP Semiconductors is a LIN 2.1–compliant System Basis Chip (SBC) integrating a 3.3 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 and communication management in body control modules and sensor nodes.
For engineers reviewing the UJA1079TW/3V3,118 datasheet, UJA1079TW/3V3,118 pinout, UJA1079TW/3V3,118 application, or UJA1079TW/3V3,118 equivalent, key selection criteria include LIN bus fault tolerance (±58 V), ±8 kV HBM ESD on LIN/wake pins, programmable watchdog window/timeout modes, 3.3 V regulator accuracy (±2 % for master, ±3 % for slave), and HTSSOP32 thermal performance with exposed die pad.
Technical Context
The UJA1079TW/3V3,118 implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp modes with deterministic transitions triggered by VBAT thresholds, wake events, or temperature. Its LIN transceiver supports low-slope mode (10.4 kbit/s) for EMC optimization and includes integrated termination diode at DLIN.
Power management features include dual wake-up inputs (WAKE1/WAKE2) with configurable sampling (16 ms/64 ms), WBIAS-controlled external biasing, and V1 undervoltage detection at 90 % (warning) or 70 % (reset) of nominal output. The watchdog uses an independent on-chip oscillator and supports Window, Timeout, and 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 in automotive sub-bus networks |
| Voltage Regulator Output | 3.3 V ±2 % (LIN master), ±3 % (LIN slave); delivers up to 250 mA - powers MCU and peripherals with tight regulation for timing-critical applications |
| ESD Protection | ±8 kV HBM on LIN and wake pins; ±6 kV IEC 61000-4-2 - meets automotive EMC requirements without external protection |
| LIN Bus Fault Tolerance | ±58 V short-circuit proof - survives load-dump and jump-start transients per ISO 7637-3 |
| Watchdog Modes | Window, Timeout, and Off - enables fail-safe MCU supervision with configurable period (8 ms to 4096 ms) |
| SPI Interface | 16-bit full-duplex; register-mapped access with read-only option - enables real-time configuration, status reporting, and diagnostics |
| Thermal Package | HTSSOP32 (SOT549-1); 6.1 mm × 11 mm with exposed die pad - provides low thermal resistance for sustained 250 mA operation |
Pinout & Package
Package: HTSSOP32 (SOT549-1), 32-pin thermally enhanced thin shrink small outline package with 0.65 mm pitch and exposed die pad for PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 4) | Regulated output | 3.3 V supply for MCU and peripherals; undervoltage warning/reset at 90 %/70 % nominal |
| RXDL (Pin 5) | LIN receive data | Logic-level output reflecting LIN bus state; used for wake-up detection and diagnostics |
| RSTN (Pin 6) | Bidirectional reset | Drives LOW during internal resets; accepts external LOW pulse for system reset; reset width configurable |
| INTN (Pin 7) | Interrupt output | Open-drain signal indicating V1 UV, LIN/local wake-up, cyclic, or power-on events |
| EN (Pin 8) | Global enable | Failsafe output controlling safety-critical hardware; driven HIGH in Normal mode when ENC = 1 |
| WAKE1 (Pin 18) | Local wake input | Digital input with configurable sampling; detects switch closure for low-power wake-up |
| WAKE2 (Pin 19) | Local wake input | Second independent wake source; supports edge-triggered interrupts (rising/falling/both) |
| LIMP (Pin 17) | Limp-home output | Active-LOW fail-safe signal activating backup hardware during critical faults (e.g., overtemperature) |
| WBIAS (Pin 28) | Wake bias control | Provides bias current to external wake switches; sampling time selectable (16 ms or 64 ms) |
| VEXCTRL (Pin 31) | External PNP base drive | Controls external transistor to extend V1 current capability and distribute thermal load |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LIN Transceiver | LIN 2.1-compliant physical layer with low-slope mode and integrated DLIN termination diode - eliminates external components and improves EMC robustness |
| Scalable Power Regulation | 3.3 V regulator delivering 250 mA with ±2 % accuracy for LIN master use - ensures stable MCU operation under cranking (VBAT ≥ 4.5 V) |
| Programmable Watchdog | Independent on-chip oscillator clock source with Window/Timeout/Off modes and 8 ms–4096 ms period - prevents MCU lockup without relying on external timing |
| Advanced Wake Management | Dual local wake inputs with configurable sampling and WBIAS bias control - enables ultra-low standby current while retaining full wake capability |
| Fault-Resilient Safety Outputs | Dedicated LIMP (limp-home) and EN (global enable) outputs - provides hardware-level fail-safe activation of backup systems during overtemperature or critical failure |
Applications
| Body Control Module (BCM) | Door Module |
|---|---|
Use Scenario: Centralized control of door locks, windows, mirrors, and interior lighting in modern vehicles. IC Role / Device Role / Timing Role: UJA1079TW/3V3,118 serves as the core power and communication hub - regulating MCU supply, handling LIN messaging, and enabling wake-from-sleep via local switches or bus activity. Use Value: Reduces BOM count by integrating regulator, transceiver, and watchdog; supports <100 µA standby current and fast wake response (<100 ms). | Use Scenario: Distributed electronics inside vehicle doors managing actuator drivers and sensor interfaces. IC Role / Device Role / Timing Role: UJA1079TW/3V3,118 provides isolated 3.3 V power, LIN connectivity, and local wake-up for window lift motors and anti-pinch sensors. Use Value: Enables fail-safe limp-home operation (via LIMP pin) during motor stall or overtemperature; withstands ±58 V LIN bus faults during service. |
| Roof Module | Seat Control Unit |
Use Scenario: Integration of sunroof, ambient lighting, and rain sensor logic in overhead console assemblies. IC Role / Device Role / Timing Role: UJA1079TW/3V3,118 supplies regulated 3.3 V to MCU and sensors, manages LIN communication with body domain controller, and monitors wake events from light or rain sensors. Use Value: Delivers ±8 kV HBM ESD protection on wake pins - eliminates need for external TVS diodes on sensor inputs. | Use Scenario: Motorized seat position memory, heating, and lumbar support controlled via LIN network. IC Role / Device Role / Timing Role: UJA1079TW/3V3,118 regulates MCU and motor driver ICs, handles LIN commands, and triggers limp-home (LIMP) if seat motor overheats or stalls. Use Value: Overtemperature shutdown and automatic LIMP activation ensure compliance with ISO 26262 ASIL-B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LIN SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UJA1076TW/3V3,118 | No integrated watchdog; lacks WDOFF pin and WD_and_Status register - reduces diagnostic depth but lowers cost | Suitable for non-safety-critical LIN slaves where watchdog supervision is handled externally | Select when system-level watchdog is implemented in MCU firmware and thermal derating is not required |
| TLE9471-3ES | Includes CAN FD interface alongside LIN; higher V1 current (350 mA); different pinout and SPI register map - not pin-compatible | Targeted at mixed-network ECUs requiring both LIN and CAN FD connectivity | Choose when future CAN integration is planned or higher current delivery (>250 mA) is needed for multi-peripheral loads |
Compared with UJA1079TW/3V3,118, UJA1076TW/3V3,118 omits watchdog functionality for cost-sensitive LIN slaves, while TLE9471-3ES adds CAN FD and higher current at the expense of pinout and register compatibility - making UJA1079TW/3V3,118 optimal for dedicated, watchdog-reliant LIN master nodes in thermally constrained HTSSOP layouts.
Availability
UJA1079TW/3V3,118 is available at Aetrix Electronics and suitable for automotive body electronics, door modules, and roof console designs requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified reliability.
Supply support for UJA1079TW/3V3,118 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 UJA1079TW/3V3,118 belongs to NXP's System Basis Chip family, engineered specifically for LIN-based automotive ECUs to consolidate power, communication, and safety functions into a single AEC-Q100 qualified device.
FAQ
What LIN protocol versions does the UJA1079TW/3V3,118 support?
The UJA1079TW/3V3,118 supports LIN 2.1 and SAE J2602, and is backward-compatible with LIN 2.0 and LIN 1.3. This ensures interoperability across legacy and next-generation LIN networks in automotive body electronics without requiring protocol translation or firmware adaptation. All versions operate using the same physical layer implementation within the UJA1079TW/3V3,118.
Does the UJA1079TW/3V3,118 include a watchdog, and how is it configured?
Yes, the UJA1079TW/3V3,118 includes an advanced independent watchdog with Window, Timeout, and Off modes. It is configured via the WMC bit in the WD_and_Status register and the WDOFF pin. The default watchdog period is 128 ms, programmable from 8 ms to 4096 ms. The watchdog uses its own on-chip oscillator, ensuring reliable supervision even if the main V1 supply or MCU fails. This functionality is confirmed in the UJA1079TW/3V3,118 datasheet Section 6.4.
What is the purpose of the LIMP pin on the UJA1079TW/3V3,118?
The LIMP pin on the UJA1079TW/3V3,118 is a dedicated fail-safe output that drives LOW during critical system faults - including overtemperature shutdown or severe undervoltage conditions. It activates application-specific 'limp home' hardware (e.g., mechanical fallback actuators or reduced-functionality modes) to maintain basic vehicle operability. The LIMP signal is latched and remains active until cleared by software or power cycle, as defined in UJA1079TW/3V3,118 Mode_Control register bit LHC.
Can the UJA1079TW/3V3,118 operate during automotive cranking conditions?
Yes, the UJA1079TW/3V3,118 is designed to operate down to VBAT = 4.5 V, meeting ISO 7637 pulse 4/4b and ISO 16750-2 cranking requirements. Its 3.3 V regulator maintains stable output under these low-voltage transients, and the LIN transceiver remains functional. The UJA1079TW/3V3,118 also features battery pin protection per ISO 7637-3, ensuring robustness during load dump and jump-start events.
How does the UJA1079TW/3V3,118 manage thermal performance in continuous 250 mA operation?
The UJA1079TW/3V3,118 uses an HTSSOP32 package (SOT549-1) with an exposed die pad that must be soldered to a large copper area on the PCB for effective heat dissipation. Thermal resistance (RθJA) is optimized for this layout, enabling continuous 250 mA output at ambient temperatures up to 105 °C. An external PNP transistor can be added via VEXCTRL/VEXCC pins to share current and further reduce junction temperature - a design option explicitly supported in UJA1079TW/3V3,118 application guidance.
UJA1079TW/3V3,118 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
UJA1079TW/3V3,118 FAQ
1.How can I place an order for UJA1079TW/3V3,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1079TW/3V3,118 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/3V3,118 reliable?
The price and inventory of UJA1079TW/3V3,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UJA1079TW/3V3,118 is usually 5 days.
3.What payment methods are accepted for UJA1079TW/3V3,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1079TW/3V3,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1079TW/3V3,118?
UJA1079TW/3V3,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1079TW/3V3,118 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/3V3,118?
For technical support, including UJA1079TW/3V3,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1079TW/3V3,118 requirements.
6.How does Aetrix verify that UJA1079TW/3V3,118 is sourced from the original manufacturer or authorized distributors?
All UJA1079TW/3V3,118 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/3V3,118 meets industry standards.
7.What is the process for return or replacement of UJA1079TW/3V3,118?
All UJA1079TW/3V3,118 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1079TW/3V3,118, 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/3V3,118 part is unused and in its original packaging.
Return procedure for UJA1079TW/3V3,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UJA1079TW/3V3,118 Tags
-
NVT4857UKAZ
NXP Semiconductors
-
TCA8418RTWR
Texas Instruments
-
PCA9546APWR
Texas Instruments
-
MD0100N8-G
Microchip Technology
-
PCA9548APW,118
NXP Semiconductors
-
PCA9540BDP,118
NXP Semiconductors
-
PCA9548APWR
Texas Instruments
-
PCA9546APW,118
NXP Semiconductors
-
PTN3360DBS,518
NXP Semiconductors
-
PCA9546ABS,118
NXP Semiconductors
-
PCA9518PWR
Texas Instruments
-
PCA9545APW,118
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
