TJA1128CTK/0Z
TJA1128CTK/0Z - LIN SBC with 3.3V LDO | NXP
The NXP Semiconductors TJA1128CTK/0Z is a LIN mini system basis chip with a 1/1 LIN transceiver, a 3.3 V low-dropout regulator, a window watchdog, two WAKE inputs, one general-purpose input, and one high-voltage multipurpose output in a 14-HVSON surface-mount package. The integrated regulator can supply up to 85 mA, while the communication and power-management functions combine multiple body-electronics functions in one compact device.
A LIN mini system basis chip is a mixed-signal interface IC that connects a low-speed LIN network node to an embedded system while providing local power regulation and system monitoring. LIN is a single-wire automotive communication standard used for distributed vehicle functions such as door modules, seat controls, lighting, climate controls, and body controllers. Integrating a LIN transceiver with an LDO and watchdog reduces component count, board area, and the number of separate interconnects required for a network node.
The TJA1128 combines the LIN physical-layer interface with an 85 mA regulator, a window watchdog, two wake inputs, a GPI, and an HVMPO output. These features support distributed vehicle electronics where sleep current, fault recovery, wake detection, and stable local supply voltage are important design priorities. The manufacturer offers regulator configurations for 3.3 V and 5.0 V outputs, with the C variant in this MPN representing the 3.3 V configuration.
Its low-current standby and sleep operating modes are particularly useful in parked vehicles, where a network node must remain able to detect a wake event without continuously loading the vehicle electrical system. The window watchdog adds a time-based supervision function for firmware and external processing elements, while the WAKE and GPI inputs expand the ways the module can react to external signals. The HVMPO output provides a high-voltage-capable output for compatible body-network functions.
Typical applications include LIN-controlled door modules, seat and window controls, climate-control endpoints, lighting controllers, body-control modules, and other distributed automotive electronic nodes. Its combination of communication, regulated auxiliary power, wake detection, and watchdog supervision is particularly useful when an ECU needs a compact interface to a LIN subnetwork rather than a complete standalone controller.
When designing a TJA1128CTK/0Z circuit, reserve filtering and protection for the LIN bus, keep high-current and transient-sensitive paths away from sensitive communication routing, and validate the regulator's thermal behavior at the highest intended auxiliary load. Because the device supports both 3.3 V and 5.0 V regulator configurations across the series, confirm the exact order code and output-voltage option before releasing a production PCB.
This product record combines the manufacturer's functional description, package information, sourcing listings, application guidance, drop-in alternatives, and practical design considerations. It is intended to help engineers identify the correct LIN system basis chip and plan the associated power, wake, watchdog, and bus-interface implementation.
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