STMicroelectronics L9333MD

Overview

L9333MD from STMicroelectronics is a monolithic quad low-side DMOS driver IC designed for automotive and industrial load control. It features four open-drain outputs with R_DS(on) = 1.5 Ω (VS > 6 V, 25 °C), programmable inverting/non-inverting transfer function via PRG pin, -14 V to 45 V input voltage range, and integrated overtemperature protection per channel - used to drive lamps, relays, and inductive solenoids in 12/24 V vehicle systems.

For engineers reviewing the L9333MD datasheet, L9333MD pinout, L9333MD application, or L9333MD equivalent, key selection criteria include its 4.5–32 V supply range, <2 µA standby current, 45 V output clamping, diagnostic open-drain output, and SO20 (12+4+4) package compatibility with high-noise automotive environments.

Technical Context

The L9333MD implements independent thermal shutdown per channel with 175 °C trip threshold and 20 K hysteresis, enabling fault-isolated operation in multi-load systems. Its DMOS outputs feature controlled slew rate (2.5–16 V/µs) and internal clamp diodes limiting flyback voltage to ≤60 V (EFB ≤ 2 mJ).

All inputs (IN1–IN4, EN, PRG) tolerate -14 V to 45 V and are 3.3 V CMOS-compatible with ~100 mV hysteresis for noise immunity. The DIAG pin provides open-drain status reporting dependent on PRG state, indicating overtemperature or ground/supply disconnection.

Key Specifications

Pinout & Package

Package: SO20 (12+4+4) - 20-pin small outline package with 12 signal pins, 4 GND pins, and 4 dedicated power/ground pins for thermal and EMI robustness.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPIC2810QPWPRQ1 and BDL100D, the L9333MD delivers superior transient resilience (45 V), precise per-channel thermal management, and flexible polarity configuration - making it optimal for safety-aware, high-reliability automotive and off-road applications where diagnostic coverage and robustness are mandatory.

Availability

L9333MD is available at Aetrix Electronics and suitable for automotive body control, industrial PLC output stages, truck lighting systems, and off-highway equipment requiring stable component supply across extended temperature and voltage ranges.

Supply support for L9333MD 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 automotive, industrial, and power management ICs with broad manufacturing and quality certifications.

The L9333MD belongs to ST's Automotive Power Switch family, engineered specifically for robust, diagnostic-capable low-side driving of inductive and resistive loads in harsh 12/24 V vehicle and industrial environments.

FAQ

What is the maximum inductive energy the L9333MD can safely recirculate?

The L9333MD is rated for flyback energy E_FB ≤ 2 mJ per channel, verified per Figure 2 and Figure 3 in the datasheet. Exceeding this limit risks exceeding the 60 V clamp voltage and triggering thermal shutdown. External snubbers or Zener clamps are required beyond this energy level.

How does the PRG pin affect diagnostic behavior?

When PRG = LOW, DIAG is active-low during normal operation and goes high during overtemperature or ground/supply loss. When PRG = HIGH, DIAG is disabled (high-impedance) during normal operation and pulls low only during overtemperature - enabling selective fault reporting per system architecture.

Can the L9333MD drive loads directly from a 3.3 V microcontroller without level shifting?

Yes - all inputs (IN1–IN4, EN, PRG) are 3.3 V CMOS-compatible with V_IN(HIGH) ≥ 2 V and V_IN(LOW) ≤ 1 V, and include ~100 mV hysteresis. No level-shifting circuitry is needed for direct interfacing with standard 3.3 V MCUs.

What is the thermal resistance of the SO20 (12+4+4) package?

The SO20 (12+4+4) package has R_th(j-p) = 15 °C/W (junction-to-pins) and R_th(j-a) = 50 °C/W (junction-to-ambient) with 6 cm² board heat sink area, as specified in the Thermal Data table on page 3 of the datasheet.