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

STMicroelectronics L6376D

Name: L6376D
Brand: STMicroelectronics
SKU: L6376D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6376D

Manufacturer:: STMicroelectronics

Category:: Power Distribution Switches, Load Drivers

Package:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Datasheet:: L6376D.pdf

Description:: IC PWR SWITCH N-CHAN 1:1 PWRSO20

Quantity:: RFQ Add To RFQ list

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Inventory:4,754

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Product details

Overview

L6376D from STMicroelectronics is a monolithic quad high-side intelligent power switch in Multipower BCD technology, designed for driving inductive, capacitive, or resistive loads in industrial control systems. It delivers 0.5 A per channel, operates from 9.5 V to 35 V supply, features non-dissipative overcurrent protection, thermal shutdown, and open-drain diagnostic output for CPU feedback.

For engineers reviewing the L6376D datasheet, L6376D pinout, L6376D application, or L6376D equivalent, this device is selected for robust load switching where fault resilience, programmable short-circuit timing, and integrated diagnostics are required in PLC I/O modules, motor starter circuits, and valve driver stages.

Technical Context

The L6376D integrates four independent high-side switches with internal current limiting (typ. 800 mA), programmable ON/OFF delay via external capacitors (50 pF–15 nF), and a charge-pump driver enabling low R_DS(on) operation up to 35 V supply. Each channel features dedicated input comparators with 200 mV hysteresis and 1.35 V turn-on threshold.

Diagnostic logic monitors under-voltage (9.5 V UVLO with 500 mV hysteresis), overtemperature (150 °C trip with 30 °C hysteresis), and per-channel overcurrent events, reporting all conditions via a single open-drain DIAG pin. The device uses internal clamping diodes for inductive load demagnetization and supports external snubber networks.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	0.5 A continuous per channel; internally limited to typ. 800 mA during short circuit.
Supply Voltage Range	9.5 V to 35 V DC; UVLO activates below 8.5 V with 500 mV hysteresis.
Output Voltage Drop	500 mV max at 500 mA and 25 °C; ensures low power dissipation during steady-state conduction.
Diagnostic Output	Open-drain DIAG pin active-low on UV, OVT, or OVC; supports wired-OR fault bus aggregation.
Short-Circuit Timing	Programmable t_ON/t_OFF (64 µs–15 ms) via CDON/CDOFF capacitors (1.28 µs/pF time constant).
Thermal Resistance	R_thJC = 1.5 °C/W; enables high-power dissipation through PowerSO-20 exposed die pad.
ESD Protection	±2 kV HBM; meets industrial immunity requirements without external protection components.

Pinout & Package

Package: PowerSO-20 - thermally enhanced surface-mount package with exposed die pad for efficient heat transfer; RoHS-compliant ECOPACK® construction.

Pin/Terminal	Circuit Role	Design Meaning
VS (Pin 6)	Positive supply input	Monitored for UVLO; IC remains OFF until ≥9 V; DIAG functional from 5 V.
O1–O4 (Pins 2,3,8,9)	High-side output terminals	Four independent switched 0.5 A outputs; each with internal current limit and clamp diode.
I1–I4 (Pins 12,13,14,15)	Digital control inputs	TTL/CMOS-compatible; 1.35 V turn-on threshold with 200 mV hysteresis for noise immunity.
DIAG (Pin 19)	Open-drain fault indicator	Asserts low on UV, OVT, or any OVC event; supports multi-device fault-bus wiring.
ON DELAY (Pin 16)	Capacitor-based t_ON programming	Connects to ground via CDON (50 pF–15 nF); sets duration of linear-mode current limiting.
OFF DELAY (Pin 17)	Capacitor-based t_OFF programming	Connects to ground via CDOFF; defines forced-off period after overcurrent detection.
R (Pin 18)	Asynchronous reset	Active-low signal forcing all outputs OFF regardless of input states; default-biased low.
GND (Pins 1,10,11,20)	Ground and thermal sink	Four dedicated pins tied to bulk substrate; critical for thermal management and EMI reduction.

Key Features

Feature	Design Value
Non-dissipative overcurrent protection	Prevents thermal runaway by cycling individual channels into linear mode instead of dissipating full short-circuit power.
Programmable short-circuit timing	Independent t_ON/t_OFF control per channel allows optimization for surge-tolerant loads (e.g., solenoids, lamps).
Integrated charge pump	Generates ~10 V gate drive above VS using VP/VCP pins and external 22 nF capacitor; maintains low R_DS(on) at high supply voltages.
Robust fault diagnostics	Single-pin DIAG reports three distinct failure modes (UV, OVT, OVC) with no external logic required for basic system monitoring.
Inductive load handling	Built-in clamping diodes enable safe demagnetization; external Zener networks extend capability for high-energy inductors.

Applications

PLC Digital Output Module

Industrial Solenoid Driver

Use Scenario: Driving 24 V DC solenoid valves in modular programmable logic controller racks with shared 24 V bus.

IC Role / Device Role / Timing Role: Quad high-side switch providing isolated, current-limited, and fault-diagnosed load control per I/O point.

Use Value: Eliminates need for discrete MOSFETs, current-sense resistors, and fault-logic ICs-reducing BOM count and PCB area by >40%.

Use Scenario: Controlling pneumatic actuators in factory automation cells where repeated inrush currents trigger false overcurrent faults.

IC Role / Device Role / Timing Role: Intelligent power switch with programmable t_ON delay to tolerate initial solenoid coil surge without latching off.

Use Value: Prevents nuisance shutdowns during normal actuation while still protecting against sustained shorts or coil failures.

Motor Starter Interface

Heater Control Unit

Use Scenario: Enabling small DC brush motors (e.g., conveyor rollers) in safety-rated machinery with integrated thermal supervision.

IC Role / Device Role / Timing Role: High-side driver with OVT-triggered DIAG output feeding safety PLC for automatic shutdown on overheating.

Use Value: Replaces relay + thermostat + watchdog circuit with single IC meeting IEC 61508 functional safety prerequisites.

Use Scenario: Switching resistive heating elements in HVAC control panels operating from unregulated 24 V industrial supplies.

IC Role / Device Role / Timing Role: Load switch with UVLO hysteresis preventing erratic cycling during brownout conditions on shared power rails.

Use Value: Ensures heater stays OFF during supply dips <8.5 V and resumes only after stable recovery-avoiding thermal stress on elements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
VNS3NV04PTR-E	Single-channel 4 A switch; no integrated diagnostic output or programmable delay; requires external current sensing.	Suitable for higher-current single-load applications but lacks multi-channel integration and fault reporting.	Select when peak load current exceeds 0.5 A and system-level diagnostics are handled externally.
TPS27082LDR	Quad 1.5 A high-side switch with integrated current sense analog output; no thermal shutdown or UVLO hysteresis.	Provides real-time current monitoring but lacks OVT protection and failsafe latch-off behavior.	Select when precise current measurement is prioritized over autonomous thermal/UV fault response.

Compared with VNS3NV04PTR-E and TPS27082LDR, the L6376D uniquely combines quad integration, non-dissipative overcurrent recovery, and unified DIAG signaling-making it optimal for space-constrained, fault-resilient industrial I/O where deterministic shutdown and minimal external components are critical.

Availability

L6376D is available at Aetrix Electronics and suitable for PLC digital output modules, industrial solenoid drivers, and motor starter interfaces requiring stable component supply, long-term lifecycle support, and compliance with industrial EMC standards (IEC 61000-4-4).

Supply support for L6376D 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, delivering automotive, industrial, and power management solutions with vertical manufacturing capabilities and broad IP portfolio.

The L6376D belongs to ST's Intelligent Power Switch family, engineered specifically for rugged industrial control applications demanding integrated protection, diagnostic transparency, and high reliability in harsh electrical environments.

FAQ

What is the maximum continuous output current per channel?

The L6376D guarantees 0.5 A continuous output current per channel at TJ ≤ 125 °C and VS = 24 V. Its internal current limit is typ. 800 mA, allowing brief surge tolerance during inductive load switching or cold filament lamp startup without triggering immediate shutdown.

How does the non-dissipative overcurrent protection work?

When overcurrent is detected, the affected channel enters linear mode-sourcing the limited ISC current-instead of hard-shutting off. This avoids high instantaneous power spikes. After a programmable t_ON, it transitions to forced-off state for t_OFF, repeating until fault clears. No external components are needed for this behavior.

Can the DIAG pin be used with a 5 V microcontroller?

Yes-the DIAG pin is open-drain and rated for up to Vs + 0.7 V. With a pull-up to 5 V, it safely interfaces with standard 5 V logic. The output sinks up to 10 mA when active, ensuring reliable low-level assertion even with multiple devices wired in parallel on a shared fault bus.

Is external demagnetization required for driving 24 V DC solenoids?

Internal clamping diodes suffice for typical 24 V solenoids with inductance ≤50 mH and energy ≤200 mJ per channel. For larger inductors or simultaneous multi-channel demagnetization, external Zener networks (e.g., 33 V Zener to ground) are recommended to prevent voltage overshoot beyond the 57 V internal clamp rating.

L6376D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Series:: -

Packaging:: Tube

Product Status:: Active

Switch Type:: General Purpose

Number of Outputs:: 4

Ratio - Input:Output:: 1:1

Output Configuration:: High Side

Output Type:: N-Channel

Interface:: On/Off

Voltage - Load:: 9.5V ~ 35V

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

Current - Output (Max):: 500mA

Rds On (Typ):: -

Input Type:: Non-Inverting

Features:: Status Flag

Fault Protection:: Current Limiting (Fixed), Over Temperature, UVLO

Operating Temperature:: -25°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSO-20

L6376D FAQ

1.How can I place an order for L6376D through Aetrix?

Please submit a Request for Quotation (RFQ) for L6376D 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 L6376D reliable?

The price and inventory of L6376D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6376D is usually 5 days.

3.What payment methods are accepted for L6376D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6376D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6376D?

L6376D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6376D 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 L6376D?

For technical support, including L6376D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6376D requirements.

6.How does Aetrix verify that L6376D is sourced from the original manufacturer or authorized distributors?

All L6376D 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 L6376D meets industry standards.

7.What is the process for return or replacement of L6376D?

All L6376D units undergo pre-shipment inspection (PSI). If there is an issue with L6376D, 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 L6376D part is unused and in its original packaging.

Return procedure for L6376D:

1.Submit a request within 90 days.

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

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