L9973-TR - Automotive Quad Half-Bridge Driver | STMicroelectronics
MPN: L9973-TR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.25 | $3.25 |
| 10 | $2.92 | $29.20 |
| 100 | $2.6 | $260.00 |
| 500 | $2.34 | $1,170.00 |
| 1,000 | $2.08 | $2,080.00 |
Drop-in alternatives for L9973-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:
L9973
β Drop-Inβ 99,999 In Stock
$2.7 / Unit
View Datasheet βL9973-TR-Q1
β Drop-Inπ Reference alternative (not in catalog)
BTN8982TA
β Drop-Inπ Reference alternative (not in catalog)
MC33887
β Drop-Inπ Reference alternative (not in catalog)
L9973-TR Maximum Ratings & Electrical Characteristics
| Supply Voltage Range | 5.5 V to 36 V |
| Output Current per Channel | 1.2 A (continuous) |
| Number of Half-Bridges | 4 |
| Quiescent Current (Standby) | 50 uA |
| Operating Temperature Range | -40C to +125C |
| Package | PowerSO-20 |
| Mounting Type | Surface Mount |
| Interface | SPI |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit |
| Thermal Resistance (junction-to-ambient) | 35 C/W |
| Output On-Resistance (typical) | 0.5 ohm |
| Switching Frequency (max) | 20 kHz |
| Logic Input Voltage | 3.3 V / 5 V compatible |
| RoHS Status | Compliant |
| AEC-Q100 Qualified | Yes |
L9973-TR Pin Configuration
| Pin 1 | OUT1 β Half-bridge 1 output |
| Pin 2 | OUT2 β Half-bridge 2 output |
| Pin 3 | GND β Ground |
| Pin 4 | OUT3 β Half-bridge 3 output |
| Pin 5 | OUT4 β Half-bridge 4 output |
| Pin 6 | VS β Supply voltage |
| Pin 7 | EN β Enable input |
| Pin 8 | SCK β SPI clock |
| Pin 9 | SDI β SPI data input |
| Pin 10 | SDO β SPI data output |
| Pin 11 | CS β SPI chip select |
| Pin 12 | GND β Ground |
| Pin 13 | OUT4 β Half-bridge 4 output |
| Pin 14 | OUT3 β Half-bridge 3 output |
| Pin 15 | GND β Ground |
| Pin 16 | OUT2 β Half-bridge 2 output |
| Pin 17 | OUT1 β Half-bridge 1 output |
| Pin 18 | VS β Supply voltage |
| Pin 19 | NC β Not connected |
| Pin 20 | NC β Not connected |
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
L9973-TR is suitable for 6 applications: Automotive Body Control Module, DC Motor Driver for Window Lifts, Stepper Motor Driver for Instrument Clusters, Industrial Automation Actuator, HVAC Blower Motor Control, Power Seat Adjustment.
Automotive Body Control Module
The L9973-TR is used in automotive body control modules to drive various actuators such as window lifts, mirror adjusters, and seat motors. Its quad half-bridge configuration allows independent control of multiple loads, while the SPI interface enables diagnostics and fault reporting. The wide supply voltage range (5.5V to 36V) accommodates both 12V and 24V vehicle systems, and the AEC-Q100 qualification ensures reliability in harsh automotive environments. The low standby current of 50 uA minimizes battery drain when the vehicle is off, and the built-in overcurrent and overtemperature protection safeguard the module against fault conditions.
Recommended
DC Motor Driver for Window Lifts
The L9973-TR drives DC motors in window lift systems, providing bidirectional control via H-bridge configuration. Each half-bridge can source or sink up to 1.2A, sufficient for typical window motors. The PWM capability up to 20 kHz allows smooth speed control and reduces audible noise. The device's protection features, including short-circuit and overtemperature, prevent damage during stall conditions. The SPI interface allows the body controller to monitor motor current and detect obstructions, enhancing safety. The PowerSO-20 package with exposed pad ensures efficient heat dissipation, even during repeated operation.
Recommended
Stepper Motor Driver for Instrument Clusters
The L9973-TR can be configured as two H-bridges to drive bipolar stepper motors used in automotive instrument clusters for gauge needles. The SPI interface allows precise control of step sequences, and the 1.2A output current is sufficient for most gauge motors. The device's low quiescent current is beneficial for always-on applications, and the wide temperature range ensures accurate operation in extreme climates. The integrated protection features prevent damage from wiring faults, and the compact PowerSO-20 package saves PCB space in space-constrained clusters.
Recommended
Industrial Automation Actuator
In industrial automation, the L9973-TR drives actuators such as solenoid valves, small DC motors, and relays. Its 5.5V to 36V supply range supports various industrial power rails, and the SPI interface enables remote monitoring and control. The device's robust protection features, including overcurrent and overtemperature, ensure reliable operation in factory environments. The low on-resistance (0.5 ohm) minimizes power loss, improving energy efficiency. The PowerSO-20 package is suitable for industrial PCBs with adequate thermal management.
Recommended
HVAC Blower Motor Control
The L9973-TR can be used to control HVAC blower motors in automotive or industrial systems. Its quad half-bridge configuration allows for H-bridge control of a single blower motor or independent control of multiple fans. The PWM capability up to 20 kHz enables efficient speed control, and the wide supply voltage range accommodates different system voltages. The device's protection features prevent damage from motor stall or short circuits, and the SPI interface allows for diagnostics and fault reporting. The low standby current is beneficial for systems that remain powered when not in use.
Recommended
Power Seat Adjustment
The L9973-TR drives the multiple DC motors used in power seat adjustment systems. Each motor can be controlled independently via the four half-bridges, allowing for precise positioning of the seat. The SPI interface enables the seat control module to monitor motor currents and detect obstructions, enhancing safety. The device's 1.2A output current is sufficient for seat motors, and the wide supply voltage range supports both 12V and 24V systems. The AEC-Q100 qualification ensures reliability in automotive applications, and the low standby current minimizes battery drain when the seat is not in use.
Recommended
Recommended Products Summary
Engineering reference data for L9973-TR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9973 | L9973-TR-Q1 | BTN8982TA | MC33887 |
|---|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Infineon | NXP Semiconductors |
| Supply Voltage Range | 5.5V to 36V | 5.5V to 36V | 5.5V to 36V | 6V to 40V | 5V to 28V |
| Output Current per Channel | 1.2A | 1.2A | 1.2A | 1.5A | 5A |
| Number of Half-Bridges | 4 | 4 | 4 | 2 | 1 (H-bridge) |
| Interface | SPI | SPI | SPI | PWM | Parallel |
| Quiescent Current (Standby) | 50 uA | 50 uA | 50 uA | 10 uA | 5 mA |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Quad half-bridge configuration in a single package (vs BTN8982TA)
- SPI interface for advanced diagnostics (vs MC33887)
- Low standby current of 50 uA (vs MC33887)
Design Notes
The L9973-TR in PowerSO-20 package has a junction-to-ambient thermal resistance of 35 C/W. When driving all four channels at 1.2A with a supply voltage of 13.5V and output on-resistance of 0.5 ohm, each channel dissipates approximately 0.72W, totaling 2.88W. This results in a junction temperature rise of about 100C above ambient. Ensure adequate PCB copper area (at least 2 square inches) and consider forced airflow for high-temperature environments.
Place decoupling capacitors (100 nF ceramic and 10 uF electrolytic) close to the VS pins to suppress voltage transients. The exposed pad should be soldered to a large copper pour connected to ground for optimal heat dissipation. Keep SPI signal traces short and shielded to minimize noise coupling, especially in automotive environments with high electromagnetic interference.
Do not exceed the absolute maximum supply voltage of 40V. Ensure the enable pin is properly controlled during power-up to prevent unintended motor activation. The SPI interface requires pull-up resistors on SDI and SDO lines; use 10k ohm resistors to VCC. When daisy-chaining multiple L9973-TR devices, ensure the chip select lines are correctly routed to avoid data corruption.
Compliance Information
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Halogen-free status not specified in available data.
