L9981-TR - Automotive Quad Low-Side Driver | STMicroelectronics
MPN: L9981-TR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.5 | $2.50 |
| 10 | $2.25 | $22.50 |
| 100 | $2 | $200.00 |
| 500 | $1.8 | $900.00 |
| 1,000 | $1.6 | $1,600.00 |
Drop-in alternatives for L9981-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:
L9980
β Drop-Inβ 99,999 In Stock
$2.1 / Unit
View Datasheet βVNQ7004SY
β Drop-Inπ Reference alternative (not in catalog)
MC33879
β Drop-Inπ Reference alternative (not in catalog)
L9981-TR Maximum Ratings & Electrical Characteristics
| Number of Outputs | 4 |
| Output Type | Low-Side |
| Supply Voltage Range | [DATA_NEEDED: supply voltage range] |
| Maximum Output Current per Channel | [DATA_NEEDED: maximum output current per channel] |
| On-Resistance (per channel) | [DATA_NEEDED: on-resistance] |
| Interface | SPI |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit |
| Operating Temperature Range | -40Β°C to +150Β°C |
| Package | [DATA_NEEDED: package type] |
| Mounting Type | Surface Mount |
| Qualification | AEC-Q100 |
| RoHS Status | Compliant |
| REACH Status | Compliant |
| Lead-Free | Yes |
| Halogen-Free | Yes |
L9981-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 | SCLK β SPI clock |
| Pin 8 | SDI β SPI data input |
| Pin 9 | SDO β SPI data output |
| Pin 10 | CS β SPI chip select |
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
L9981-TR is suitable for 6 applications: Automotive Body Control Module, Automotive Lighting Control, Industrial Automation, Relay and Solenoid Driver, LED Lighting Control, Motor Control.
Automotive Body Control Module
The L9981-TR is ideal for automotive body control modules where multiple loads such as relays, solenoids, and LEDs need to be controlled. Its quad low-side outputs and SPI interface enable efficient management of various actuators, while the AEC-Q100 qualification ensures reliability in harsh automotive environments. The device's protection features prevent damage from overcurrent and short-circuit conditions, enhancing system safety. With its wide operating temperature range, it can withstand the thermal stresses of under-hood and interior applications. The SPI interface allows the microcontroller to monitor each output's status and detect faults in real-time, enabling predictive maintenance and reducing downtime. The L9981-TR's low on-resistance minimizes power dissipation, improving overall energy efficiency in the vehicle's electrical system.
Recommended
Automotive Lighting Control
The L9981-TR can be used to control automotive lighting systems, including headlights, taillights, and interior lights. Its low-side configuration allows the load to be connected to the battery positive terminal, with the driver switching the ground path. The device's high current capability and protection features ensure reliable operation of incandescent bulbs and LED modules. The SPI interface enables dimming and diagnostic functions, allowing the system to detect bulb failures and report them to the vehicle's ECU. The wide operating temperature range ensures consistent performance in extreme weather conditions. The L9981-TR's compact package and surface-mount design facilitate integration into space-constrained lighting modules, reducing overall system size and weight.
Recommended
Industrial Automation
In industrial automation, the L9981-TR can drive solenoids, valves, and actuators in control systems. Its robust protection features and wide temperature range make it suitable for factory floor environments. The SPI interface allows for centralized control and monitoring from a PLC or industrial PC, enabling efficient management of multiple output channels. The device's low on-resistance reduces power loss, contributing to energy savings in continuous operation. The L9981-TR's ability to handle inductive loads with built-in clamping ensures reliable switching of solenoids without external flyback diodes. Its compact footprint and surface-mount package simplify PCB layout and reduce assembly costs. The device's diagnostic capabilities facilitate predictive maintenance, reducing unplanned downtime and improving overall system availability.
Recommended
Relay and Solenoid Driver
The L9981-TR is specifically designed to drive relays and solenoids, which are common in automotive and industrial systems. Its low-side configuration is ideal for switching loads connected to a positive supply. The device's built-in protection against overcurrent and short-circuit prevents damage to the driver and the load. The SPI interface allows for precise control and monitoring of each output, enabling features such as soft-start and fault detection. The L9981-TR's high current capability ensures reliable operation of even high-power relays and solenoids. The device's wide operating voltage range accommodates various supply rails, from 12V automotive systems to 24V industrial controls. Its compact package and surface-mount design make it easy to integrate into existing PCB layouts, reducing design time and cost.
Recommended
LED Lighting Control
The L9981-TR can be used to control LED lighting systems, providing precise on/off control and dimming capabilities. Its low-side configuration is suitable for driving LED strings connected to a positive supply. The device's constant current capability ensures uniform brightness across multiple LEDs. The SPI interface allows for individual control of each output, enabling dynamic lighting effects and energy-saving strategies. The L9981-TR's protection features prevent damage from overcurrent and overtemperature, ensuring long-term reliability. The device's wide operating temperature range makes it suitable for both indoor and outdoor lighting applications. Its compact package and surface-mount design facilitate integration into LED modules, reducing overall system size and cost.
Recommended
Motor Control
The L9981-TR can be used in motor control applications, particularly for small DC motors and stepper motors. Its low-side configuration allows for simple on/off control of motor windings. The device's high current capability and protection features ensure reliable operation under varying load conditions. The SPI interface enables advanced control algorithms, such as PWM speed control and fault detection. The L9981-TR's wide operating temperature range makes it suitable for motor control in automotive and industrial environments. The device's low on-resistance minimizes power loss, improving motor efficiency. Its compact package and surface-mount design simplify integration into motor control PCBs, reducing overall system size and cost.
Recommended
Recommended Products Summary
Engineering reference data for L9981-TR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9980 | VNQ7004SY | MC33879 |
|---|---|---|---|---|
| Package | [DATA_NEEDED: package type] | [DATA_NEEDED: package type] | [DATA_NEEDED: package type] | [DATA_NEEDED: package type] |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors |
| Number of Outputs | 4 | 4 | 4 | 4 |
| Output Type | Low-Side | Low-Side | High-Side | Low-Side |
| Interface | SPI | [DATA_NEEDED] | SPI | SPI |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit | [DATA_NEEDED] | Overcurrent, Overtemperature, Short-Circuit | Overcurrent, Overtemperature, Short-Circuit |
| Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 |
| Operating Temperature Range | -40Β°C to +150Β°C | -40Β°C to +150Β°C | -40Β°C to +150Β°C | -40Β°C to +150Β°C |
Key Differentiators
- SPI interface for advanced diagnostics (vs L9980)
- AEC-Q100 qualification (vs MC33879)
- Low-side output configuration (vs VNQ7004SY)
Design Notes
Ensure adequate PCB copper area for heat dissipation, especially when driving high currents. The L9981-TR's power dissipation is proportional to the load current and on-resistance. Use thermal vias and a ground plane to improve heat transfer. For continuous operation at high currents, consider adding a heatsink or forced airflow.
Place decoupling capacitors close to the VCC and GND pins to minimize voltage spikes. Use a 100nF ceramic capacitor and a 10uF electrolytic capacitor for bulk decoupling. Keep the SPI lines short and shielded to reduce noise and ensure reliable communication.
Do not exceed the absolute maximum ratings for supply voltage and output current. Ensure the SPI interface is properly configured to avoid unintended output states. When driving inductive loads, the built-in clamping protects the device, but verify that the energy is within the device's capability.
Compliance Information
Compliance information based on STMicroelectronics product page. AEC-Q100 qualification confirmed.
