Infineon Technologies TLE8457ALEXUMA1

Overview

TLE8457ALEXUMA1 from Infineon Technologies is a monolithic automotive-grade LIN transceiver with integrated 5 V low-dropout linear voltage regulator (70 mA), compliant to ISO 17987-4 and SAE J2602, supporting up to 20 kBit/s data rate, ultra-low standby current (20 µA typical), and BUS short-to-GND/short-to-VBAT protection - used in battery-supplied LIN slave modules such as rain sensors and window lifters.

For engineers reviewing the TLE8457ALEXUMA1 datasheet, TLE8457ALEXUMA1 pinout, TLE8457ALEXUMA1 application, or TLE8457ALEXUMA1 equivalent, key selection criteria include VCC undervoltage reset behavior, EN-controlled mode transitions (sleep/standby/normal), BUS wake-up sensitivity, and PG-TSON-8 package suitability for AOI and thermal management in compact automotive ECUs.

Technical Context

The device integrates a LIN physical layer transceiver and LDO regulator on a single BiCMOS die, enabling direct microcontroller supply and bus communication with coordinated power-state control via EN and TxD pins. It implements an initialization watchdog that forces sleep mode if no valid response occurs after power-up or wake-up events.

Operating modes - Normal, Standby, Init, and Sleep - are determined by EN/TxD logic states and monitored by internal supply monitors (VS undervoltage, VCC undervoltage, overtemperature). The BUS pin features high-impedance fail-safe design with <1 µA leakage and built-in termination, while NRST provides synchronous reset assertion during VCC faults.

Key Specifications

Pinout & Package

Package: PG-TSON-8 (leadless, thermally enhanced), RoHS-compliant, supports automated optical inspection (AOI) and PCB heat sink connection via exposed pad (PAD1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LIN transceiver with integrated regulator applications.

Compared with TLIN1029DRBR and MC33664DTBR2G, TLE8457ALEXUMA1 uniquely combines 5 V regulation, EN-controlled multi-mode operation, integrated NRST, and PG-TSON-8 thermal performance - making it optimal for new AEC-Q100-compliant LIN slave nodes requiring robust power sequencing and compact packaging.

Availability

TLE8457ALEXUMA1 is available at Aetrix Electronics and suitable for automotive body electronics, battery-supplied sensor modules, and LIN-based comfort systems requiring stable component supply across production lifecycles.

Supply support for TLE8457ALEXUMA1 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

Infineon Technologies is a German semiconductor manufacturer specializing in automotive, power management, and industrial control ICs, with leadership in AEC-Q100-qualified analog and mixed-signal solutions.

The TLE8457A/B product line delivers integrated LIN transceivers with embedded regulators for automotive body electronics, designed specifically to reduce system cost and board space in battery-connected slave nodes.

FAQ

What is the function of the NRST pin?

The NRST pin is an open-drain reset output that goes low when VCC falls below 4.5 V or during LDO fault conditions. It provides synchronous reset signaling to the connected microcontroller, ensuring reliable recovery from undervoltage events without requiring external supervision circuitry.

Does TLE8457ALEXUMA1 support LIN 2.2A and SAE J2602 compliance?

Yes - the device is explicitly certified compliant with ISO 17987-4 (LIN Physical Layer), LIN Specification 2.2A, and SAE J2602. Its timing parameters, bus impedance, dominant time-out, and wake-up sensitivity meet all mandatory requirements for automotive LIN slave implementations.

How does the initialization watchdog operate?

The initialization watchdog triggers after power-up, wake-up, or reset if the microcontroller fails to assert a valid TxD signal within the timeout period. It forces automatic transition to sleep mode to prevent uncontrolled bus activity or regulator instability due to MCU non-responsiveness.

Can TLE8457ALEXUMA1 be used with a 3.3 V microcontroller?

No - TLE8457ALEXUMA1 provides only a 5 V LDO output. For 3.3 V MCU systems, Infineon's TLE8457BLE (3.3 V variant) or alternatives like TLIN1029DRBR should be selected; using a level shifter on RxD/TxD does not resolve the incompatible supply voltage requirement.