STMicroelectronics L6375STR

Overview

L6375STR from STMicroelectronics is a 0.5 A high-side intelligent power switch in SO-8 package, designed for controlled driving of inductive, capacitive, or resistive loads with integrated short-circuit protection, thermal shutdown, and undervoltage lockout. It features differential inputs with ±7 V common-mode range, open-load detection, dual diagnostic outputs (DIAG1/DIAG2), and internal voltage clamping (53 V typical) for fast demagnetization-used in industrial PLC output modules and motor control interface stages.

For engineers reviewing the L6375STR datasheet, L6375STR pinout, L6375STR application, or L6375STR equivalent, this device supports robust load switching in harsh environments requiring IEC 61000-4-4 burst immunity, ±2 kV HBM ESD tolerance, programmable short-circuit timeout via external capacitor, and real-time fault reporting through open-drain diagnostic pins.

Technical Context

The L6375STR integrates a high-side NDMOS power switch with linear-mode current limiting (ISC = 1.1 A typ.) and non-dissipative short-circuit recovery-enabling safe cyclic operation during permanent overload without thermal runaway. Its input stage uses a hysteresis-equipped comparator (Vith = 1.3 V typ., Viths = 400 mV) compatible with TTL/CMOS logic across wide supply ranges.

Diagnostic logic maps five fault conditions-open load (Iold = 3 mA typ.), short-to-VS, short-to-ground, overtemperature (Tmax = 150 °C), and undervoltage (Vsth1 = 7.5 V)-to two open-drain outputs using a deterministic truth table. Internal Zener clamping (Vcl = 53 V) handles up to 200 mJ inductive energy at TJ = 85 °C without external components.

Key Specifications

Pinout & Package

SO-8 package (ECOPACK® compliant), surface-mount, 1.27 mm pitch, standard single-sided FR-4 mounting with 0.5 cm² copper pour for Rth(JA) ≤ 100 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side intelligent power switch applications.

Compared with VNS3NV04PTR-E and IPS1031HTR, the L6375STR delivers higher current (0.5 A), full diagnostic encoding, programmable fault timeout, and superior inductive energy handling (200 mJ)-making it the optimal choice for industrial-grade load switching requiring functional safety awareness and field reliability.

Availability

L6375STR is available at Aetrix Electronics and suitable for industrial PLC output modules, automated valve control systems, smart lighting drivers, and test equipment load interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L6375STR 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 power management, analog, microcontrollers, and automotive ICs-with over 40 years of industrial-grade product development experience.

The L6375STR belongs to ST's Intelligent Power Switch (IPS) family, engineered specifically for high-reliability industrial control applications demanding integrated protection, diagnostics, and ruggedized operation in harsh electromagnetic environments.

FAQ

What is the maximum inductive energy the L6375STR can safely absorb during demagnetization?

The L6375STR internal Zener clamp is rated for 200 mJ of inductive energy absorption at junction temperature TJ = 85 °C. This value decreases linearly with increasing temperature-derating to approximately 120 mJ at TJ = 125 °C per the device's thermal data. External snubbers are unnecessary for loads within this energy limit.

How does the ON DELAY pin affect short-circuit behavior?

The ON DELAY pin sets the tON duration during short-circuit events using an external capacitor (50 pF–2 nF): tON = 1.28 μs/pF. This delay prevents false triggering on capacitive inrush or cold-filament lamps. Grounding the pin disables programmable timing and forces immediate shutdown with ISC current limiting active but diagnostics disabled.

Can the L6375STR drive loads referenced to ground instead of VS?

No-the L6375STR is a high-side switch only and must drive loads connected between OUTPUT and ground. It cannot function as a low-side switch. For ground-referenced loads, a complementary low-side driver (e.g., VNQ7E050AKTR) is required; mixing topologies requires isolated control signaling.

What diagnostic fault conditions are reported on DIAG1 and DIAG2 simultaneously?

DIAG1 and DIAG2 jointly report five conditions via defined logic states: normal operation (both high), open load (DIAG1 low), short-to-VS (DIAG1 low), short-to-ground (DIAG2 low), overtemperature (DIAG2 low), and undervoltage (both low). The truth table in Section 3.8 of the datasheet defines all combinations unambiguously.