STMicroelectronics L9333MD-TR

Overview

L9333MD-TR 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, -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-TR datasheet, L9333MD-TR pinout, L9333MD-TR application, or L9333MD-TR equivalent, key selection criteria include output current limiting (400–1000 mA), diagnostic open-drain status reporting, controlled output slew rate (2.5–16 V/µs), and 2 µA standby quiescent current under EN low - all critical for robust EMI-compliant body electronics designs.

Technical Context

The L9333MD-TR implements four independent low-side DMOS power switches fabricated in ST's MultiPower BCD technology, each with internal current limiting, thermal shutdown (T_JSD = 175–220 °C, 20 K hysteresis), and integrated clamp diodes enabling fast inductive recirculation up to 60 V flyback. Its PRG pin selects signal polarity, while EN enables global sleep mode.

All inputs (IN1–IN4, EN, PRG) tolerate -14 V to 45 V with ±100 mV hysteresis for noise immunity; the DIAG pin provides open-drain fault reporting dependent on PRG state - low during normal operation if PRG = low, high during overtemperature or ground disconnect - supporting fail-safe system diagnostics.

Key Specifications

Pinout & Package

Package: SO-20 (12+4+4) surface-mount package with exposed thermal pad; 13.0 mm × 7.6 mm footprint, 2.65 mm height, R_th(j-p) = 15 °C/W (junction-to-pins).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VNQ5E04TR-E and TLE6232GP, the L9333MD-TR uniquely balances programmable signal polarity, per-channel thermal diagnostics, and adjustable slew rate in a compact SO-20 package - making it optimal for space-constrained, EMI-sensitive body electronics where firmware flexibility and fault isolation are prioritized over serial configurability or lowest BOM cost.

Availability

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

Supply support for L9333MD-TR 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, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The L9333MD-TR belongs to ST's Automotive Power Switch family, engineered specifically for robust, diagnostic-capable load driving in 12/24 V vehicle electrical architectures - emphasizing reliability, EMI resilience, and functional safety readiness.

FAQ

What is the maximum allowable flyback energy for safe operation of the L9333MD-TR?

The L9333MD-TR is specified for inductive loads with flyback energy E_FB ≤ 2 mJ, as confirmed in the Functional Description section (page 7). Exceeding this value risks exceeding the internal clamp diode's safe operating area, potentially causing thermal runaway or permanent damage. External snubbers or TVS devices are recommended for higher-energy inductors like large solenoids or contactor coils.

How does the PRG pin affect the DIAG output behavior during normal operation?

When PRG = low, the DIAG pin is actively pulled low during normal operation and goes high only during fault conditions (overtemperature or ground disconnect). When PRG = high, DIAG is disabled (high-impedance) during normal operation and pulls low only during overtemperature events - enabling distinct fault signaling modes without external logic inversion.

Can the L9333MD-TR drive capacitive loads such as LED strings without additional circuitry?

Yes - the L9333MD-TR can directly drive LED strings with appropriate current-limiting resistors, as its open-drain outputs and defined OFF-state prevent leakage-induced glow. However, for high-brightness or long-string configurations, verify that peak output current (≤1 A short-circuit limit) and thermal derating (R_th(j-a) = 50 °C/W) remain within safe margins under worst-case ambient conditions.

Is the L9333MD-TR qualified for automotive AEC-Q100 Grade 1 operation?

Yes - the L9333MD-TR is AEC-Q100 qualified for Grade 1 (-40 °C to +125 °C ambient), as documented in ST's official product brief and qualification report (DocID6973 Rev 2). Its junction temperature rating extends to +150 °C, and thermal shutdown activates at 175–220 °C, ensuring compliance with automotive reliability requirements.