TJA1128ATK/0Z - 28V LIN SBC with 85mA LDO | NXP
MPN: TJA1128ATK/0Z ✓ ActiveTJA1128ATK/0Z Overview
A LIN system basis chip, or SBC, is an automotive interface IC that consolidates communication, local power regulation, reset supervision, and wake-up control. Within the automotive electronics hierarchy, the TJA1128 combines a LIN physical-layer transceiver, LDO voltage regulator, watchdog timer, and system-control functions into one device, reducing the number of discrete components required around a body or comfort-zone controller.
The device's main functional blocks include a LIN transceiver, selectable 3.3V or 5.0V regulator output, window watchdog, two WAKE inputs, a general-purpose input, and a high-voltage multipurpose output. The regulator's 85mA capability is suitable for automotive low-power microcontrollers, sensor interfaces, and communication nodes that need a compact local supply. Its LIN interface supports the physical communication layer used by distributed vehicle networks.
The TJA1128 family is positioned for low-speed automotive body, comfort, door, lighting, seat, sensor, and control-module applications. Its integrated watchdog provides supervision of controller execution, while the wake-up inputs support low-power system activation. The 3.0mm by 4.5mm HVSON package supports compact PCB layouts where space and component count are important.
A robust implementation should account for automotive transient exposure, LIN bus wiring, regulator decoupling, ground-return quality, and watchdog timing. The 14-HVSON package also requires careful assembly and solder-joint inspection because its fine-pitch lead arrangement can complicate rework. Automotive programs should verify the exact ordering code, temperature grade, qualification status, and production configuration before releasing the BOM.
This product summary combines the manufacturer architecture description, package information, interface functions, regulator capability, and automotive qualification context with practical guidance for circuit implementation. It also distinguishes verified device characteristics from parameters that remain design-dependent, helping engineers evaluate the TJA1128ATK/0Z without conflating a generic LIN transceiver with a fully integrated automotive system basis chip.
Drop-in alternatives for TJA1128ATK/0Z — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TJA1128ATK/0Z (same form factor and footprint) — differing in General-Purpose Inputs, High-Voltage Multipurpose Outputs, Integrated Regulator, Mounting Type, Package.
TJA1145ATK/FD/0Z
✅ Drop-In📋 Reference alternative (not in catalog)
TJA1128FTK/0Z
✅ Drop-InContact for price
View Datasheet →TJA1128GTK/0Z
✅ Drop-InContact for price
View Datasheet →TJA1128ATK/0Z Specifications
| Product Type | LIN mini system basis chip (SBC) |
| LIN Transceiver Configuration | 1/1 half-duplex LIN transceiver |
| Integrated Regulator | 3.3V or 5.0V low-dropout voltage regulator (LDO) |
| Regulator Output Current | Up to 85mA |
| Supply Voltage Range | 3V to 28V |
| Watchdog | Integrated window watchdog |
| Wake-Up Inputs | 2 inputs |
| General-Purpose Inputs | 1 input |
| High-Voltage Multipurpose Outputs | 1 output |
| Package | 14-HVSON, 3.0mm x 4.5mm |
| Mounting Type | Surface mount |
| Automotive Qualification | AEC-Q100 |
| Application Classification | Automotive |
| Moisture Sensitivity Level | MSL 1 |
| Peak Reflow Temperature | 260C |
| Maximum Peak Reflow Time | 30s |
| Terminal Finish | Nickel palladium gold silver |
TJA1128ATK/0Z 14-hvson, 3.0mm x 4.5mm Pin Configuration Guide
Pin configuration for TJA1128ATK/0Z (14-hvson, 3.0mm x 4.5mm package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for TJA1128ATK/0Z.
Refer to the datasheet for full pin configuration.
Typical Applications
TJA1128ATK/0Z is suitable for 6 applications: Automotive Body Control Module, Door and Seat Control Node, Automotive Sensor Gateway, Exterior Lighting Controller, Vehicle Comfort and Convenience System, Low-Power Wake-Up Interface Module.
Automotive Body Control Module
The TJA1128ATK/0Z fits compact body-control modules that communicate over LIN while powering a local controller. Its 3.3V or 5.0V LDO can deliver up to 85mA, reducing the need for a separate regulator, while the window watchdog supervises microcontroller execution. Two WAKE inputs support low-power activation, and the general-purpose input plus high-voltage multipurpose output expand control options. The 14-HVSON package occupies only 3.0mm by 4.5mm, helping reduce board area in distributed door, lighting, seat, and comfort-control modules.
Recommended
Door and Seat Control Node
A LIN-connected door or seat controller can use the TJA1128ATK/0Z to combine communications, local power, and monitoring in one device. The 85mA regulator output is suitable for a low-power automotive microcontroller and its sensors, while the integrated window watchdog adds an execution check without a separate supervisor IC. Wake-up inputs help the node remain responsive while minimizing vehicle quiescent-current demand. Its compact 3.0mm by 4.5mm 14-HVSON package is particularly useful where connector and harness space constrain the PCB.
Recommended
Automotive Sensor Gateway
The TJA1128ATK/0Z is suitable for a LIN sensor gateway that gathers information from distributed low-speed vehicle nodes. Its half-duplex LIN transceiver provides the physical interface, while the integrated 3.3V or 5.0V regulator supplies up to 85mA to a local controller and attached circuitry. The window watchdog and two wake-up inputs support reliable operation and controlled activation, and the high-voltage multipurpose output can serve compatible external functions. Package size and integrated control reduce the component count of compact gateway PCBs.
Recommended
Exterior Lighting Controller
A distributed exterior-lighting controller can use the TJA1128ATK/0Z to manage a LIN command interface and supply a small controller rail. The selectable 3.3V or 5.0V LDO output supports common embedded-controller requirements and provides up to 85mA, while the watchdog helps detect stalled firmware. Wake-up inputs permit external activation, and the high-voltage multipurpose output adds flexible peripheral control. The small 14-HVSON package supports compact electronics near lighting modules without requiring separate interface and supervision devices.
Recommended
Vehicle Comfort and Convenience System
The TJA1128ATK/0Z can serve as the local interface for comfort-system functions such as switch modules, climate-control endpoints, and powered accessories controlled over LIN. Consolidating the transceiver, regulator, watchdog, and wake-up logic reduces PCB component count and shortens the number of interconnects needed for basic control. An 85mA regulated output supports a microcontroller and low-power peripherals, while the 3.0mm by 4.5mm package allows placement near connectors where space is limited and harness routing can be shortened.
Recommended
Low-Power Wake-Up Interface Module
The TJA1128ATK/0Z is appropriate for a low-power module that must monitor external wake-up conditions and communicate over LIN when activated. Its two WAKE inputs provide direct external stimulus paths, while the integrated regulator and watchdog support a compact controller implementation. The 3.3V or 5.0V LDO output, rated up to 85mA, can serve the MCU and limited sensor load without a separate local regulator. Automotive qualification context and the small HVSON footprint make this device useful in distributed modules where standby behavior, diagnostics, and fast assembly are priorities.
Recommended
Recommended Products Summary
Engineering reference data for TJA1128ATK/0Z — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TJA1145ATK/FD/0Z | TJA1128FTK/0Z | TJA1128GTK/0Z |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 14-HVSON (3.0mm x 4.5mm) | 14-HVSON (3.0mm x 4.5mm) | 14-HVSON (3.0mm x 4.5mm) | 14-HVSON (3.0mm x 4.5mm) |
| Product Category | LIN mini system basis chip | LIN mini system basis chip | LIN mini system basis chip | LIN mini system basis chip |
| Automotive Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 |
Key Differentiators
- Combines six functional blocks in one automotive SBC (vs TJA1145ATK/FD/0Z)
- Selectable local rail supports two common MCU voltage levels (vs TJA1145ATK/FD/0Z)
- Integrated supervision and wake-up reduce discrete component count (vs TJA1128FTK/0Z)
Design Notes
Place the regulator input, output, and decoupling capacitors directly beside their associated TJA1128 pins, and route the regulator return to the device ground through the shortest practical path. Keep the LIN bus trace away from sensitive wake-up and general-purpose input routing. Because the device is a fine-pitch 14-HVSON package, follow the manufacturer land-pattern and assembly recommendations rather than creating a footprint from package height alone.
Do not treat a shared 14-HVSON outline as proof of a drop-in substitution. Confirm every pin function, regulator voltage option, current capability, watchdog timing, wake-up polarity, and diagnostic behavior against the official ordering table and datasheet. The TJA1145ATK/FD/0Z and TJA1128 ordering variants must pass this review before an existing PCB is reused.
Protect the LIN connection from automotive transients and route it as a controlled network segment with the protection components placed near the connector or entry point. Maintain the recommended ground relationship between the transceiver, regulator, and MCU supply returns. Validate wake-up thresholds and noise immunity in the final harness configuration because connector placement, cable routing, and adjacent power systems can affect real vehicle behavior.
Use the NXP package thermal information when sizing exposed-pad copper and the surrounding PCB area. The integrated regulator can deliver up to 85mA, but actual dissipation depends on battery-to-regulator voltage, selected output voltage, load, and ambient temperature. Validate the final junction-temperature margin at maximum vehicle operating temperature rather than relying only on nominal supply conditions.
Compliance Information
The device is associated with AEC-Q100 automotive qualification. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status require confirmation from the exact NXP product documentation or manufacturer declaration.
