Part Number: L9779WD-SPI-TR

Manufacturer: STMicroelectronics


Shipped from: Shenzhen/HK Warehouse

Stock Available: Check with us


The L9779WD-SPI-TR is a cutting-edge integrated circuit built for the harsh automobile environment. This versatile IC, which is implemented utilizing cutting-edge BCD6S technology, provides a complete range of functions customized to common engine management control units. In this comprehensive tutorial, we will delve into the L9779WD-SPI-TR’s features, capabilities, and applications, providing you with a solid grasp of this exceptional automotive component.

Introduction to L9779WD-SPI-TR

The L9779WD-SPI-TR is an outstanding automotive integrated circuit with exceptional performance and functionality. Let’s look at its essential features and why it’s such an important component for engine management control units.

● BCD6S Technology

The L9779WD-SPI-TR is built with BCD6S technology, a hybrid of Bipolar-CMOS-DMOS (BCD) and Silicon-on-Insulator (SOI). This novel combination optimizes power management and economy, making it excellent for automotive applications.

● All Basic Functions Covered

The ability of the L9779WD-SPI-TR to provide all of the core functions required for typical engine management control units is one of its key advantages. This integrated circuit serves as the foundation for a variety of automobile control systems, making it a necessary component in modern vehicles.

● HiQUAD-64 Power Package

The HiQUAD-64 power package houses the L9779WD-SPI-TR. This improves its endurance and robustness while also ensuring that it can resist the rigors of the automobile environment. The package design allows for effective heat dissipation and long-term dependability.

Key Features

The L9779WD-SPI-TR is well-known for its outstanding array of capabilities, which set it apart in the domain of automotive electronics. Let’s look deeper into the notable properties that make this integrated circuit a standout choice for automotive applications.


The L9779WD-SPI-TR has a number of regulators that are critical to the dependable and efficient operation of numerous systems in an automotive setting.

  • 5 V Logic Regulator: This regulator serves as the circuit’s backbone, supplying logic circuits with a consistent 5 V power supply. This power supply’s dependability is crucial for the smooth operation of digital components, ensuring that they perform as intended.
  • 3 V Logic Regulator: The L9779WD-SPI-TR is compatible with a wide range of digital components thanks to its dedicated 3.3 V logic regulator. This adaptability enables the integration of various components, adding to the circuit’s flexibility and adaptability.
  • 5 V Tracking Sensor Supply: The L9779WD-SPI-TR additionally has a separate 5 V supply for tracking sensors. This dedicated supply guarantees that tracking sensors perform precisely, which is critical for a variety of automotive applications. This characteristic is critical for precise and accurate sensor operation, whether for navigation, control systems, or safety functions.

These regulators work together to provide a strong power management system, supplying the required voltages to various circuit components and ensuring that they perform effectively and dependably. The combination of dependable voltage supply and specific sensor support demonstrates the circuit’s dedication to automotive performance and safety.

Smart Reset Function

The smart reset function is intended to improve the engine management control unit’s overall safety. It aids with the safe completion of the driver switch-off operation.

Engine Off Functionality

The L9779WD-SPI-TR has a Power Latch as well as Secure Engine Off (SEO) capabilities. This feature ensures that the engine shutdown process is not only efficient but also safe, reducing the possibility of damage or malfunction.

VRS Functionality

The VRS (Flying Wheel Interface Function) allows for adaptive timing and amplitude control. This capability is critical in automotive applications for maintaining precise timing and amplitude control.

IGBT Pre-Drivers

The L9779WD-SPI-TR incorporates IGBT pre-drivers (IGN1 to IGN4) with parallel inputs, allowing for fine control of the ignition system.

Configurable Power Stages

Configurable Power Stages (CPS) provide flexibility and adaptability by allowing customisation to meet diverse engine management requirements.

Stepper Motor Driver

The integrated stepper motor driver (OUTA to OUTD) allows for accurate control of stepper motors, which are common in engine management systems.

Thermal Warning and Shutdown

The L9779WD-SPI-TR has thermal warning and shutdown measures to avoid overheating and potential damage, extending the device’s lifespan.


The L9779WD-SPI-TR’s outstanding adaptability and advanced features place it at the center of a wide range of automotive applications. Let’s look at some of the key places where this integrated circuit is important:

1. Engine Management Control Units:

The L9779WD-SPI-TR, located at the core of every vehicle’s engine control system, plays a key role in optimizing engine performance, fuel efficiency, and overall reliability. It enables precise management of numerous engine settings, assuring top engine performance while fulfilling emissions criteria.

2. Transmission Control:

The L9779WD-SPI-TR is a critical component in transmission control systems, allowing precise control over gear shifts and performance. It ensures smooth gear changes, improving the driving experience and vehicle efficiency.

3. Vehicle Diagnostics:

The interoperability of the L9779WD-SPI-TR with communication interfaces such as ISO9141 and CAN is crucial for car diagnostics and maintenance. It enables mechanics and technicians to interact with the vehicle’s onboard systems, identify problems, and efficiently perform necessary repairs and maintenance activities.

4. Steering and Suspension Control:

The L9779WD-SPI-TR’s capabilities assist steering and suspension systems, improving safety and comfort. The IC allows for more accurate control of steering systems and suspension components, resulting in a more comfortable and safe ride for vehicle occupants.

5. Safety Systems:

The L9779WD-SPI-TR’s secure engine-off feature makes it a suitable option for integration into safety systems. It is essential in safety measures such as airbag deployment and anti-lock brakes. The ability to safely finish the engine shutdown operation helps to the vehicle’s and its passengers’ overall safety.

To summarize, the versatility and advanced characteristics of the L9779WD-SPI-TR make it a vital component in today’s automotive landscape. This integrated circuit plays a critical role in determining the automotive industry’s future, providing the foundation for sophisticated and dependable automotive systems. It does everything from improving engine performance and transmission management to enabling vehicle diagnostics and assuring passenger safety.


The L9779WD-SPI-TR is a technological marvel in the automobile industry, with a plethora of features, capabilities, and applications to choose from. Understanding the functionality and significance of this integrated circuit is critical in recognizing the complexity and reliability of current vehicle management systems, whether you are an automotive engineer, a technician, or simply an enthusiast. The L9779WD-SPI-TR, with its advanced features, durable design, and compatibility with many communication protocols, plays an important part in creating the future of automotive technology.

Please contact us at ICRFQ, a major electronic component distributor in China, with any questions or to place an order for L9779WD-SPI-TR and other electronic components.

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