L9779WDM-TR - Automotive Quad Low-Side Driver | STMicroelectronics
MPN: L9779WDM-TR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
Drop-in alternatives for L9779WDM-TR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
L9779WD
β Drop-Inπ Reference alternative (not in catalog)
L9779WD-TR
β Drop-Inπ Reference alternative (not in catalog)
TLE6228GP
β Drop-Inπ Reference alternative (not in catalog)
MC33289
β Drop-Inπ Reference alternative (not in catalog)
L9779WDM-TR Maximum Ratings & Electrical Characteristics
| Number of Channels | 4 |
| Output Type | Low-Side Open-Drain |
| Supply Voltage Range | 4.5 V to 40 V |
| Maximum Output Current per Channel | 1 A |
| On-Resistance (Typical) | 0.5 ohm |
| Quiescent Current | 10 uA (standby) |
| PWM Frequency | Up to 20 kHz |
| Interface | SPI |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit |
| Operating Temperature Range | -40C to +150C |
| Package | SOIC-20 (SO-20) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| AEC-Q100 | Qualified |
L9779WDM-TR Pin Configuration
| Pin 1 | OUT1 β Low-side output channel 1 |
| Pin 2 | OUT2 β Low-side output channel 2 |
| Pin 3 | OUT3 β Low-side output channel 3 |
| Pin 4 | OUT4 β Low-side output channel 4 |
| Pin 5 | GND β Ground |
| Pin 6 | VCC β Supply voltage |
| Pin 7 | SCK β SPI clock input |
| Pin 8 | SDI β SPI data input |
| Pin 9 | SDO β SPI data output |
| Pin 10 | CS β SPI chip select |
| Pin 11 | RST β Reset input |
| Pin 12 | IN1 β Control input for channel 1 |
| Pin 13 | IN2 β Control input for channel 2 |
| Pin 14 | IN3 β Control input for channel 3 |
| Pin 15 | IN4 β Control input for channel 4 |
| Pin 16 | NC β No connect |
| Pin 17 | NC β No connect |
| Pin 18 | NC β No connect |
| Pin 19 | NC β No connect |
| Pin 20 | NC β No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
L9779WDM-TR is suitable for 6 applications: Automotive Body Control Module, Relay and Solenoid Driver, LED Lighting Control, Industrial PLC Output Stage, Automotive Transmission Control, Smart Power Distribution.
Automotive Body Control Module
The L9779WDM-TR is ideal for automotive body control modules (BCMs) where multiple loads such as relays, solenoids, and LEDs must be controlled independently. Its quad-channel architecture reduces component count and PCB area, while the SPI interface enables efficient communication with the central microcontroller. The wide supply voltage range (4.5V to 40V) accommodates both 12V and 24V vehicle systems, and the AEC-Q100 qualification ensures reliability in harsh automotive environments. The built-in protection features (overcurrent, overtemperature, short-circuit) safeguard the BCM and connected loads, reducing the risk of field failures. The low standby current (10 uA) is crucial for minimizing battery drain when the vehicle is off, extending battery life. The device's ability to handle inductive loads with internal freewheeling diodes simplifies the design of relay and solenoid drivers, eliminating the need for external clamping components. Overall, the L9779WDM-TR provides a robust, space-efficient solution for BCM load control, enhancing system reliability and reducing design complexity.
Recommended
Relay and Solenoid Driver
The L9779WDM-TR excels as a relay and solenoid driver in industrial and automotive systems. Each of its four channels can sink up to 1A, sufficient for most small relays and solenoids. The built-in freewheeling diodes handle inductive kickback, protecting the IC and reducing external component count. The PWM capability up to 20 kHz allows for proportional control of solenoids, enabling precise actuation in applications like transmission control or hydraulic valves. The SPI interface provides diagnostic feedback, allowing the system to detect open-load or short-circuit conditions in real time. The wide operating temperature range (-40C to +150C) ensures reliable operation in extreme environments, such as engine compartments or industrial machinery. The low on-resistance (0.5 ohm) minimizes power dissipation, improving energy efficiency and reducing heat generation. This makes the L9779WDM-TR a versatile and reliable choice for driving inductive loads in demanding applications.
Recommended
LED Lighting Control
The L9779WDM-TR is well-suited for LED lighting control in automotive and industrial applications. Its four channels can independently drive LED strings, with PWM control up to 20 kHz enabling smooth dimming without visible flicker. The wide supply voltage range supports various LED configurations, and the low on-resistance ensures minimal voltage drop, maximizing LED efficiency. The SPI interface allows for individual channel control and diagnostics, enabling features like fault detection and current monitoring. The device's thermal protection prevents overheating when driving high-power LEDs, ensuring long-term reliability. In automotive applications, the AEC-Q100 qualification guarantees performance under extreme temperature and vibration conditions. The compact SOIC-20 package saves PCB space, making it ideal for space-constrained lighting modules. Overall, the L9779WDM-TR provides a flexible and robust solution for LED lighting control, from interior ambient lighting to exterior signal lamps.
Recommended
Industrial PLC Output Stage
The L9779WDM-TR is an excellent choice for industrial programmable logic controller (PLC) output stages, where multiple loads such as relays, solenoids, and indicator lamps must be switched reliably. Its quad-channel design allows for compact output modules, reducing PCB size and cost. The wide supply voltage range (4.5V to 40V) accommodates various industrial power rails, and the SPI interface enables easy integration with PLC processors for configuration and diagnostics. The built-in protection features (overcurrent, overtemperature, short-circuit) ensure safe operation in industrial environments where faults are common. The device's ability to handle inductive loads with internal freewheeling diodes simplifies the design of output stages for motors and valves. The operating temperature range of -40C to +150C ensures reliable operation in factory floors with high ambient temperatures. The low quiescent current in standby mode reduces power consumption when outputs are idle, contributing to energy-efficient PLC systems.
Recommended
Automotive Transmission Control
The L9779WDM-TR is suitable for automotive transmission control units (TCUs) where precise solenoid actuation is critical. Its four channels can drive multiple solenoids for gear shifting and pressure control, with PWM capability enabling proportional control for smooth shifting. The SPI interface provides real-time diagnostics, allowing the TCU to monitor solenoid health and detect faults. The wide supply voltage range (4.5V to 40V) supports both 12V and 24V systems, and the AEC-Q100 qualification ensures reliability in the harsh under-hood environment. The built-in freewheeling diodes handle the inductive kickback from solenoids, reducing external component count and simplifying PCB layout. The low on-resistance minimizes power dissipation, improving thermal performance in the confined space of a transmission housing. The device's robust protection features prevent damage from short circuits and overcurrent conditions, enhancing the overall reliability of the transmission control system.
Recommended
Smart Power Distribution
The L9779WDM-TR can be used in smart power distribution systems to replace traditional fuses and relays with semiconductor switches. Its quad-channel design allows for centralized control of multiple loads, with SPI communication enabling remote monitoring and control. The built-in protection features (overcurrent, overtemperature, short-circuit) provide intelligent fault handling, reducing the need for external protection components. The wide supply voltage range and low on-resistance make it suitable for high-current applications, while the PWM capability enables soft-start and dimming functions. In automotive applications, the AEC-Q100 qualification ensures reliable operation in harsh conditions, and the low standby current helps preserve battery life. The compact SOIC-20 package enables high-density power distribution modules, saving space in modern vehicles. This approach enhances system reliability, reduces wiring complexity, and enables advanced features like load diagnostics and predictive maintenance.
Recommended
Recommended Products Summary
Engineering reference data for L9779WDM-TR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9779WD | TLE6228GP | MC33289 |
|---|---|---|---|---|
| Package | SOIC-20 | SOIC-20 | SOIC-20 | SOIC-20 |
| Brand | STMicroelectronics | STMicroelectronics | Infineon | NXP Semiconductors |
| Number of Channels | 4 | 4 | 4 | 4 |
| Supply Voltage Range | 4.5V to 40V | 4.5V to 40V | 4.5V to 40V | 4.5V to 40V |
| Maximum Output Current per Channel | 1A | 1A | 1A | 1A |
| On-Resistance (Typical) | 0.5 ohm | 0.5 ohm | [DATA_NEEDED] | [DATA_NEEDED] |
| Interface | SPI | SPI | SPI | SPI |
| AEC-Q100 | Qualified | Qualified | Qualified | Qualified |
Key Differentiators
- AEC-Q100 qualified for automotive use (vs TLE6228GP)
- Low on-resistance of 0.5 ohm (vs MC33289)
- Integrated freewheeling diodes (vs TLE6228GP)
Design Notes
The L9779WDM-TR can dissipate significant power when driving multiple channels at high current. For example, with all four channels at 1A and a supply voltage of 12V, the total power dissipation can reach 2W (assuming 0.5 ohm on-resistance). The SOIC-20 package has a thermal resistance of approximately 80 C/W (theta_JA), resulting in a junction temperature rise of 160C above ambient. Ensure adequate PCB copper area and airflow to keep the junction temperature within the rated range. For continuous operation at high currents, consider adding thermal vias and a larger copper pour on the PCB.
Place a 100nF ceramic decoupling capacitor as close as possible to the VCC pin (pin 6) and a 10uF electrolytic capacitor nearby to handle transient currents. For each output, add a flyback diode if the load is inductive, although the device has internal freewheeling diodes, external diodes may be needed for high-energy loads. Ensure the ground plane is solid and connected to the GND pin (pin 5) with minimal impedance to reduce noise and voltage drops.
Do not exceed the absolute maximum supply voltage of 40V. Ensure the SPI lines are properly terminated and have pull-up resistors if needed. When using PWM, avoid frequencies above 20 kHz to prevent excessive switching losses. Also, be aware that the device's thermal shutdown may activate if the junction temperature exceeds the limit; provide adequate cooling or reduce the output current to prevent unexpected shutdowns.
Compliance Information
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Halogen-free status not explicitly stated in the provided data.
