STMicroelectronics L6364W

Overview

L6364W from STMicroelectronics is a dual-channel IO-Link and SIO transceiver IC designed as a physical-layer bridge between microcontrollers and 24 V industrial data buses. It integrates configurable CQ/DIO output stages (5 Ω R_SW, 100 ns switching), IO-Link UART (COM2/COM3 compliant), 3.3 V/5 V linear regulators, and a 50 mA DC-DC converter (0.5–2 MHz, 5–10.5 V output). It drives L/C/R loads in factory automation sensors with reverse polarity protection, ±1.5 kV surge immunity, and thermal shutdown up to 216 °C.

For engineers reviewing the L6364W datasheet, L6364W pinout, L6364W application, or L6364W equivalent, this device supports SPI-configurable high-side/low-side/push-pull drive modes, programmable current-limit thresholds (0.11–0.25 A per channel), quartz-free clock extraction at 38.4 kbaud and 230.4 kbaud, and dual LED drivers (up to 8 mA each) - all critical for IO-Link sensor node design.

Technical Context

The L6364W implements a fully integrated IO-Link physical layer with three UART operating modes: Transparent (microcontroller handles full protocol), Single-octet (interrupt per byte), and Multi-octet (8-byte buffer with frame-level interrupt). Its dual analog I/O channels (CQ and DIO) share identical 5 Ω on-resistance switches, Zener-limited demagnetization (8 V), and independent short-circuit detection with user-configurable thresholds.

Internal power management includes two linear regulators (V3V3: 3.3 V @ 50 mA; V5V: 5.0 V @ 50 mA) and a synchronous buck DC-DC converter (VDCDC output adjustable from 5 V to 10.5 V, frequency from 0.5 MHz to 2 MHz), all supplied from VPLUS (5–35 V). The logic core operates from V3V3, while digital I/O voltage level shifting is controlled by VDIG (2.5–5.5 V compatible).

Key Specifications

Pinout & Package

Available in Smart QFN-20L (4 × 4 mm) and CSP-19 (2.5 × 2.5 mm) packages. Both variants support identical pin functions and thermal performance (R_th(JC) = 3.9 °C/W for QFN, 4.9 °C/W for CSP).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar IO-Link transceiver applications.

Compared with MAX14827 and TJA1145A, the L6364W uniquely combines dual-channel IO-Link PHY, integrated power regulation (linear + DC-DC), and hardware-configurable drive modes - enabling single-chip sensor node designs that meet IEC 61131-2, IEC 61000-4-5, and IO-Link v1.1 requirements without external support components.

Availability

L6364W is available at Aetrix Electronics and suitable for industrial sensors, factory automation systems, and process control equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for L6364W 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in intelligent power, motion control, and industrial connectivity solutions.

The L6364W belongs to ST's IO-Link transceiver product line, engineered specifically for robust, low-footprint industrial sensor nodes requiring integrated power, protection, and protocol-aware physical layer functionality.

FAQ

What IO-Link communication modes does the L6364W support, and how do they affect MCU firmware load?

The L6364W supports Transparent, Single-octet, and Multi-octet UART modes. In Transparent mode, the MCU handles full IO-Link framing and checksum; in Multi-octet mode, the IC buffers up to 8 bytes and triggers INT on completion, reducing MCU interrupt frequency by 8×; Single-octet mode generates an interrupt per byte for continuous streaming. This lets designers trade off buffer size against real-time response.

How does the Join Mode configuration impact current capability and thermal performance?

In Join Mode (CQ and DIO externally shorted), the L6364W doubles its overload current threshold to 0.5 A and reduces total conduction loss by distributing current across both 5 Ω output stages. This cuts junction temperature rise by ~35% at 400 mA versus single-channel operation, enabling sustained drive of high-current solenoids or valves without derating.

Can the L6364W operate without an external crystal, and what timing accuracy does it achieve?

Yes - the L6364W uses an internal PLL with quartz-free clock extraction synchronized to the IO-Link master's 38.4 kbaud or 230.4 kbaud signal. It achieves ±1.5% bit timing accuracy over −40 °C to +125 °C, meeting IO-Link v1.1 physical layer jitter and stability requirements without external timing components.

What protection features are embedded on the VPLUS, CQ, and DIO pins, and how are they validated?

VPLUS, CQ, DIO, and PGND pins feature integrated reverse-polarity diodes, ±1.5 kV/50 μs surge immunity (IEC 61000-4-5 Level 3), and ±35 V steady-state voltage tolerance. These are verified per ST's qualification test plan DS13363 Rev 6, including JEDEC JESD22-A114E ESD testing (2 kV HBM) and surge waveform validation using 500 Ω coupling network per IEC 61000-4-5 Ed.3.