STMicroelectronics L9352B-TR-LF

Overview

L9352B-TR-LF from STMicroelectronics is an intelligent quad low-side power switch for automotive ABS valve control, featuring two 5 A conventional switches (Ch1–Ch2) and two 2.5 A current-regulated outputs (Ch3–Ch4), 0.2 Ω typical R_DS(on), integrated Z-diodes (Ch1–Ch2) and freewheeling diodes (Ch3–Ch4), and real-time status monitoring per channel.

For engineers reviewing the L9352B-TR-LF datasheet, L9352B-TR-LF pinout, L9352B-TR-LF application in ABS systems, or L9352B-TR-LF equivalent for current-regulated valve drivers, this page delivers verified electrical specs, diagnostic timing, regulator accuracy, and PowerSO-36 thermal performance data required for functional safety-compliant design.

Technical Context

The L9352B-TR-LF integrates four independent low-side output stages with dual protection architectures: Ch1–Ch2 use active Zener clamping (V_Z = 45–60 V) for fast inductive turn-off, while Ch3–Ch4 employ freewheeling diodes with current-sense resistor-based regulation. Each channel includes dedicated push-pull status outputs with inverted logic on fault detection.

Regulation on Ch3–Ch4 operates via a digital PI controller synchronized to a 250 kHz external clock, accepting 2 kHz PWM inputs to set target current (0–2.25 A) with ±6% accuracy at 90% duty cycle; drift detection compares regulator outputs to identify long-term load degradation.

Key Specifications

Pinout & Package

Package: PowerSO-36 with integrated cooling area (ECOPACK®), thermally optimized for high-power automotive applications requiring direct PCB heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad low-side current-regulated switch applications.

Compared with VNQ5E050AKTR-E and TPS4H160-Q1, the L9352B-TR-LF uniquely integrates dual-mode switching (5 A conventional + 2.5 A regulated), per-channel status reporting, and hardware-based drift detection-reducing MCU firmware burden and enabling ASIL-B–compliant ABS designs without external components.

Availability

L9352B-TR-LF is available at Aetrix Electronics and suitable for automotive braking systems, electric power steering modules, and start-stop solenoid control requiring stable component supply, AEC-Q100 Grade 0 qualification, and long-term production continuity.

Supply support for L9352B-TR-LF 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 specializing in automotive-grade power ICs, microcontrollers, and sensors with ISO/TS 16949-certified manufacturing.

The L9352B belongs to ST's intelligent power switch product line, designed specifically for functional safety-critical automotive body and chassis applications requiring integrated protection, diagnostics, and current regulation.

FAQ

What is the maximum allowable supply voltage (VS) for continuous operation?

The L9352B-TR-LF supports VS from 4.8 V to 18 V for normal operation, with absolute maximum rating of 40 V. Operation above 18 V is permitted only during transient conditions (e.g., ISO 7637-2 pulse 1/2a), and clamping diodes limit output voltage to 60 V during inductive turn-off.

How does the current regulator on channels 3 and 4 achieve ±6% accuracy?

Accuracy is achieved through a digital PI controller synchronized to the 250 kHz external clock, measuring current during the freewheeling phase via a sense resistor in series with D3/D4, and correlating input PWM duty cycle (2 kHz) to output current with fixed f_CLK/f_IN = 125 ratio per Figure 4 in the datasheet.

Can the L9352B-TR-LF be used without the external 250 kHz clock signal?

No-the external clock is mandatory for Ch3–Ch4 regulation and diagnostic filtering. If CLK is absent or below 100 kHz, regulators disable and status outputs default to open-load state; Ch1–Ch2 remain functional as conventional switches but lose recirculation clamping synchronization.

What thermal derating applies when operating at 150°C junction temperature?

At T_j = 150°C, R_DS(on) increases by ~20% versus 25°C (per typical SOA curves), reducing max continuous current to ~4.2 A for Ch1–Ch2 and ~2.1 A for Ch3–Ch4; full 5 A/2.5 A ratings require T_j ≤ 125°C with adequate PCB copper area per PowerSO-36 thermal guidelines.