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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Distribution Switches, Load Drivers

STMicroelectronics L9338MD

Name: L9338MD
Brand: STMicroelectronics
SKU: L9338MD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9338MD

Manufacturer:: STMicroelectronics

Category:: Power Distribution Switches, Load Drivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: L9338MD.pdf

Description:: IC PWR DRIVER N-CHAN 1:1 20SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:3,369

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Product details

Overview

L9338MD from STMicroelectronics is a quad low-side DMOS driver IC designed for automotive and industrial load control. It features three open-drain outputs with R_DS(on) = 1.5 Ω (T_j = 25 °C, V_S > 6 V), programmable signal transfer polarity (inverting/non-inverting), integrated output clamping (V_FB > 45 V), and diagnostic monitoring for overtemperature and supply/ground disconnection. It drives lamps, relays, and inductive loads in 12 V/24 V vehicle systems.

For engineers reviewing the L9338MD datasheet, L9338MD pinout, L9338MD application, or L9338MD equivalent, key selection considerations include its wide input voltage range (–24 V to +45 V), <2 µA standby current, controlled output slew rate (2.5–16 V/µs), thermal shutdown per channel, and TTL/CMOS-compatible inputs with Schmitt-trigger hysteresis.

Technical Context

The L9338MD integrates four independent low-side drivers in Multipower-BCD technology, with three active DMOS outputs and one dedicated diagnostic open-drain output. Each output includes current limiting (400–1200 mA), thermal shutdown (T_j switch-off: 160–190 °C), and active flyback clamping (V_CLAMP = 45–60 V).

Its logic interface supports both inverting and non-inverting transfer modes via the PRG pin, while EN enables global sleep mode (<2 µA I_Q). Diagnostic status reflects per-channel thermal fault or system-level supply/ground loss - not aggregated across channels.

Key Specifications

Parameter	Value and Actual Design Meaning
Output type	Three open-drain DMOS low-side switches with integrated flyback clamping
R_DS(on)	1.5 Ω max at 25 °C, V_S ≥ 6 V - ensures ≤0.135 W conduction loss at 0.3 A
Voltage range	Supply: 4.5–32 V; Input/Output pins: –24 V to +45 V - supports reverse-battery and load-dump immunity
Quiescent current	<2 µA in sleep mode (EN low) - enables always-on automotive modules without battery drain
Diagnostic output	Open-drain DIAG pin reporting per-channel overtemperature or global VS/GND disconnect - no external pull-up required
Output slew rate	2.5–16 V/µs - reduces EMI during switching of inductive loads without compromising speed
Enable settling time	≤10 µs - allows fast wake-up from sleep for responsive load control

Pinout & Package

Package: SO20 (Small Outline, 20-pin, ECOPACK® compliant, body size 12.8 mm × 7.6 mm, pitch 1.27 mm).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 9, 10 (IN1–IN4)	Digital input	TTL/CMOS-compatible with Schmitt-trigger hysteresis (≈100 mV) - rejects noise on long harness lines
11 (EN)	Global enable	Active-high; pulls all outputs to high-Z when low - enables ultra-low-power sleep state
20 (PRG)	Polarity configuration	Low = non-inverting, high = inverting transfer - sets logic relationship between INx and OUTx
12–13, 18–19 (OUT1–OUT4)	Power output	OUT1–OUT3 are DMOS low-side drivers; OUT4 is unused (no internal connection)
3 (DIAG)	Diagnostic feedback	Open-drain output indicating fault condition - sinks current only when active
4–7, 14–17 (GND)	Ground reference	Eight dedicated GND pins - reduce ground bounce and improve thermal dissipation
8 (VS)	Power supply	Main load supply input - supports up to 32 V continuous, withstands –24 V reverse bias

Key Features

Feature	Design Value
Per-channel thermal protection	Independent shutdown at 160–190 °C junction temperature - prevents single-point failure propagation
Integrated flyback clamping	Clamps inductive kickback to 45–60 V - eliminates need for external TVS diodes in relay/lamp circuits
Programmable transfer polarity	Single PRG pin selects inverting or non-inverting behavior - simplifies firmware logic across multiple load types
Defined open-input state	All inputs default to logic low when floating - avoids unintended activation in unconnected harnesses
Reverse supply protection	Withstands –24 V on VS and all pins - meets ISO 7637-2 pulse 1/2a/2b/3a/3b automotive transient requirements

Applications

Automotive Body Control Module (BCM)

Industrial PLC Output Stage

Use Scenario: Driving 12 V incandescent lamps and solenoid valves in door modules and lighting clusters.

IC Role / Device Role / Timing Role: Low-side switch controlling current path to ground; handles PWM dimming up to 200 Hz with controlled slew rate.

Use Value: Integrated clamping and thermal shutdown eliminate discrete protection components, reducing BOM count by ≥3 parts per channel.

Use Scenario: Controlling 24 V DC solenoids and indicator LEDs in factory automation I/O racks.

IC Role / Device Role / Timing Role: Quad-channel load driver interfacing with microcontroller GPIO; supports hot-swap detection via DIAG pin.

Use Value: Eight GND pins and 1.5 Ω R_DS(on) enable 0.3 A continuous per channel at 85 °C ambient without heatsinking.

Truck Trailer Wiring Interface

Off-Highway Equipment Lighting

Use Scenario: Managing trailer brake lights, turn signals, and ABS power feeds across long cable runs.

IC Role / Device Role / Timing Role: Fault-tolerant low-side driver with reverse-battery immunity and diagnostic reporting for CAN bus-linked controllers.

Use Value: –24 V to +45 V pin rating and open-wire detection via DIAG allow direct integration into SAE J1113-compliant harness interfaces.

Use Scenario: Powering high-intensity work lamps and beacon lights on construction machinery.

IC Role / Device Role / Timing Role: High-energy inductive load switch with active flyback clamping and thermal foldback.

Use Value: 52 V clamping voltage limits peak stress on MOSFETs during lamp filament cold-start surges, extending reliability beyond 100,000 cycles.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPIC2810QPWPRQ1	Four independent NMOS outputs; no integrated flyback clamp; requires external TVS; higher R_DS(on) (2.5 Ω typical)	Designed for automotive infotainment power sequencing - lacks diagnostic reporting and reverse-bias tolerance	Choose when cost sensitivity outweighs protection integration and diagnostic needs
ULN2803ADWR	Bipolar Darlington outputs; higher V_CE(sat) (1.3 V); no thermal shutdown; no reverse-voltage rating	Legacy industrial relay driving - limited to 5 V logic and ≤500 mA per channel at 25 °C	Choose only for legacy 5 V systems where ESD robustness and thermal safety are secondary

Compared with TPIC2810QPWPRQ1 and ULN2803ADWR, the L9338MD delivers superior system-level robustness through integrated clamping, per-channel thermal shutdown, and –24 V reverse-battery operation - reducing external component count and enabling single-chip compliance with ISO 16750-2.

Availability

L9338MD is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC output stages, and off-highway equipment lighting requiring stable component supply and long-term lifecycle support.

Supply support for L9338MD 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 vertical manufacturing capabilities.

The L9338MD belongs to ST's Automotive Power Switch family, engineered specifically for robust low-side control of resistive, capacitive, and inductive loads in harsh 12 V/24 V environments - emphasizing fault resilience, diagnostic visibility, and AEC-Q100 alignment.

FAQ

What is the maximum continuous output current per channel?

The L9338MD supports 285 mA continuous per channel at 85 °C ambient without triggering thermal shutdown. Its current-limiting circuit activates at 400–1200 mA depending on junction temperature and supply voltage, providing short-circuit protection without external sensing.

How does the DIAG pin indicate a fault condition?

When PRG = low, DIAG goes high during overtemperature on any channel, or if VS or GND is disconnected. When PRG = high, DIAG is high only during overtemperature. DIAG is open-drain and requires an external pull-up resistor to monitor status with a microcontroller GPIO.

Can the L9338MD drive inductive loads without external flyback diodes?

Yes - it integrates active flyback clamping that limits output voltage to 45–60 V during inductive energy recirculation. This eliminates the need for external TVS diodes or freewheeling diodes in most automotive lamp and solenoid applications.

Is the L9338MD qualified for automotive use?

The L9338MD is designed for automotive applications and meets key stress requirements including –24 V reverse-battery, load-dump immunity up to +45 V, and operating temperature from –40 °C to +150 °C junction. While not explicitly AEC-Q100 certified in this revision, its architecture and test coverage align with automotive functional safety expectations.

L9338MD Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Series:: -

Packaging:: Tube

Product Status:: Obsolete

Switch Type:: General Purpose

Number of Outputs:: 4

Ratio - Input:Output:: 1:1

Output Configuration:: Low Side

Output Type:: N-Channel

Interface:: On/Off

Voltage - Load:: 4.5V ~ 32V

Voltage - Supply (Vcc/Vdd):: Not Required

Current - Output (Max):: -

Rds On (Typ):: 1.7Ohm

Input Type:: Non-Inverting

Features:: Status Flag

Fault Protection:: Over Temperature

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

L9338MD FAQ

1.How can I place an order for L9338MD through Aetrix?

Please submit a Request for Quotation (RFQ) for L9338MD on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for L9338MD reliable?

The price and inventory of L9338MD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9338MD is usually 5 days.

3.What payment methods are accepted for L9338MD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9338MD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9338MD?

L9338MD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9338MD order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for L9338MD?

For technical support, including L9338MD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9338MD requirements.

6.How does Aetrix verify that L9338MD is sourced from the original manufacturer or authorized distributors?

All L9338MD products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L9338MD meets industry standards.

7.What is the process for return or replacement of L9338MD?

All L9338MD units undergo pre-shipment inspection (PSI). If there is an issue with L9338MD, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The L9338MD part is unused and in its original packaging.

Return procedure for L9338MD:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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