STMicroelectronics

L9972-TR - Automotive Dual H-Bridge Driver | STMicroelectronics

Name: L9972-TR
Brand: STMicroelectronics
Price: 3.25 USD
Availability: InStock

MPN: L9972-TR ✓ Active

In Stock (99,999) Ships in 1-3 business days

5.5 V to 36 V Vdss 1.2 A (continuous) Id 35 °C/W Rds(on) PowerSO-20 Package 5 MHz (max) Speed

$3.25 USD / Unit

MOQ: 1 |

Volume Pricing

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

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for L9972-TR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

L9973-TR

✅ Drop-In

STMicroelectronics

📦 PowerSO-20

5.5 V to 36 V · 1.2 A (continuous) · 4 · 50 uA · -40C to +125C · PowerSO-20 · Surface Mount · SPI

✓ 99,999 In Stock

$2.08 / Unit

View Datasheet →

DRV8842

✅ Drop-In

📦 PowerSO-20

Cross-brand, similar dual H-bridge, but SPI register map differs

📋 Reference alternative (not in catalog)

VNH5019A

⚡ Same Package

📦 PowerSO-20

Higher current rating (30A), not pin-compatible, requires circuit redesign

📋 Reference alternative (not in catalog)

L9972-TR Maximum Ratings & Electrical Characteristics

Supply Voltage Range	5.5 V to 36 V
Output Current per Channel	1.2 A (continuous)
Number of H-Bridges	2
Control Interface	SPI
Quiescent Current (Standby)	50 µA
Overcurrent Protection	Yes
Overtemperature Protection	Yes
Undervoltage Lockout	Yes
Package	PowerSO-20
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to +150°C
Thermal Resistance (junction-to-ambient)	35 °C/W
SPI Clock Frequency	5 MHz (max)
RoHS Status	Compliant
AEC-Q100 Qualified	Yes

L9972-TR Pin Configuration

Pin 1	OUT1 — H-bridge 1 output
Pin 2	OUT2 — H-bridge 1 output
Pin 3	VS — Supply voltage
Pin 4	GND — Ground
Pin 5	OUT3 — H-bridge 2 output
Pin 6	OUT4 — H-bridge 2 output
Pin 7	GND — Ground
Pin 8	CSN — SPI chip select (active low)
Pin 9	SCK — SPI clock
Pin 10	SDI — SPI data input
Pin 11	SDO — SPI data output
Pin 12	EN — Enable input
Pin 13	GND — Ground
Pin 14	VS — Supply voltage
Pin 15	OUT5 — H-bridge 2 output
Pin 16	OUT6 — H-bridge 2 output
Pin 17	GND — Ground
Pin 18	OUT7 — H-bridge 1 output
Pin 19	OUT8 — H-bridge 1 output
Pin 20	VS — Supply voltage

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

L9972-TR is suitable for 6 applications: Automotive Power Window Lift, Seat Adjustment Motor, HVAC Flap Control, Industrial Automation, Robotics, Small Appliance Motor Drive.

🚗

Automotive Power Window Lift

The L9972-TR drives the DC motor for power windows, providing bidirectional control and diagnostic feedback via SPI. Its 1.2A output current and 5.5V-36V supply range match typical window lift motors. The low standby current of 50 µA minimizes battery drain when the ignition is off. Overcurrent and overtemperature protection ensure reliable operation in harsh automotive environments. The SPI interface allows the body control module to monitor motor current and detect obstructions, enhancing safety.

Recommended

STM32F103 (Microcontroller for SPI control) L9973-TR · STMicroelectronics

🚗

Seat Adjustment Motor

The L9972-TR controls seat position motors, enabling forward/reverse movement with precise speed control. Its dual H-bridge can drive two motors independently, such as for seat base and backrest. The wide supply voltage range accommodates 12V automotive systems. The SPI interface provides real-time diagnostics, allowing the ECU to detect stall conditions and prevent damage. The PowerSO-20 package with exposed pad ensures thermal management during continuous operation.

Recommended

STM32F0 (Low-cost MCU for SPI control) DRV8842 (Cross-brand alternative)

🚗

HVAC Flap Control

The L9972-TR drives the DC motors that adjust HVAC air flaps, providing bidirectional control for temperature and airflow regulation. Its 1.2A output current is sufficient for small flap motors, and the SPI interface allows the HVAC controller to read position feedback from external sensors. The device's protection features prevent damage from stalled motors, common in flap systems. The low quiescent current is beneficial for reducing battery drain in parked vehicles.

Recommended

STM32L0 (Low-power MCU for SPI control) L9973-TR · STMicroelectronics

🏭

Industrial Automation

In industrial automation, the L9972-TR drives small DC motors for conveyor belts, actuators, and robotic arms. Its 5.5V-36V supply range supports 24V industrial systems. The SPI interface enables integration with PLCs or microcontrollers for precise speed and direction control. The device's robust protection features ensure reliable operation in factory environments with electrical noise. The PowerSO-20 package allows for compact PCB designs in control cabinets.

Recommended

STM32F4 (High-performance MCU for SPI control) DRV8842 (Cross-brand alternative)

🤖

Robotics

The L9972-TR is used in robotics to drive DC motors for wheel movement, arm joints, and grippers. Its dual H-bridge allows independent control of two motors, enabling differential drive for mobile robots. The SPI interface provides high-speed communication for real-time control loops. The device's low quiescent current is advantageous for battery-powered robots. Protection features prevent damage from motor stalls or overcurrent conditions during operation.

Recommended

STM32F3 (MCU with advanced timers for motor control) L9973-TR · STMicroelectronics

🔧

Small Appliance Motor Drive

The L9972-TR drives motors in small appliances such as fans, pumps, and kitchen gadgets. Its 1.2A output current is suitable for small DC motors, and the wide supply voltage range supports both 12V and 24V systems. The SPI interface allows for advanced features like speed control and diagnostics. The device's protection features ensure safe operation in consumer products. The PowerSO-20 package is compact enough for space-constrained appliance designs.

Recommended

STM8S (Low-cost MCU for SPI control) DRV8842 (Cross-brand alternative)

Recommended Products Summary

STM32F103 Microcontroller for SPI control Used in: Automotive Power Window Lift L9973-TR STMicroelectronics Used in: Automotive Power Window Lift, HVAC Flap Control, Robotics STM32F0 Low-cost MCU for SPI control Used in: Seat Adjustment Motor DRV8842 Cross-brand alternative Used in: Seat Adjustment Motor, Industrial Automation, Small Appliance Motor Drive STM32L0 Low-power MCU for SPI control Used in: HVAC Flap Control STM32F4 High-performance MCU for SPI control Used in: Industrial Automation STM32F3 MCU with advanced timers for motor control Used in: Robotics STM8S Low-cost MCU for SPI control Used in: Small Appliance Motor Drive

What is the supply voltage range of the L9972-TR?

The L9972-TR operates from a supply voltage range of 5.5V to 36V. According to the STMicroelectronics L9972 datasheet, this wide range supports both 12V and 24V automotive and industrial systems, providing flexibility for various motor control applications.

What is the maximum output current per channel of the L9972-TR?

The L9972-TR can deliver up to 1.2A continuous output current per H-bridge channel. This makes it suitable for driving small to medium DC motors, such as those used in power windows, seat adjusters, and HVAC flaps in automotive applications.

Does the L9972-TR have overcurrent protection?

Yes, the L9972-TR includes overcurrent protection on each output stage. According to the STMicroelectronics datasheet, this protection limits the output current to prevent damage to the IC and the motor in fault conditions, enhancing system reliability.

What is the quiescent current of the L9972-TR in standby mode?

The L9972-TR has a quiescent current of 50 µA in standby mode. This low standby current is critical for automotive applications to minimize battery drain when the ignition is off, as specified in the STMicroelectronics datasheet.

What package is the L9972-TR available in?

The L9972-TR is available in a PowerSO-20 package. This surface-mount package includes an exposed pad for improved thermal dissipation, making it suitable for high-current motor driver applications in confined spaces.

Is the L9972-TR AEC-Q100 qualified?

Yes, the L9972-TR is AEC-Q100 qualified. This automotive-grade qualification ensures the device meets stringent reliability standards for use in automotive environments, as stated in the STMicroelectronics product page.

What is the operating temperature range of the L9972-TR?

The L9972-TR operates over a temperature range of -40°C to +150°C. This wide range allows the device to function reliably in harsh automotive under-hood environments, as specified in the datasheet.

Can the L9972-TR drive stepper motors?

Yes, the L9972-TR can drive bipolar stepper motors by using both H-bridges to control the two motor phases. The SPI interface allows for precise current and step control, making it suitable for stepper motor applications in automotive and industrial systems.

What is the SPI clock frequency of the L9972-TR?

The L9972-TR supports SPI clock frequencies up to 5 MHz. This high-speed interface enables fast communication with a microcontroller for real-time motor control and diagnostics, as detailed in the STMicroelectronics datasheet.

Does the L9972-TR have overtemperature protection?

Yes, the L9972-TR includes overtemperature protection. According to the datasheet, the device shuts down if the junction temperature exceeds the safe limit, preventing thermal damage and ensuring safe operation under overload conditions.

What is the thermal resistance of the L9972-TR?

The L9972-TR has a junction-to-ambient thermal resistance of 35 °C/W. This value, from the datasheet, indicates the need for adequate PCB copper area and thermal vias to dissipate heat effectively in high-current applications.

Where can I buy the L9972-TR online?

The L9972-TR is available from major distributors such as DigiKey and Mouser. As of 2026-08-13, pricing starts at $3.25 for single-unit quantities, with volume discounts available. Check current stock and lead times on their websites.

What is the price of the L9972-TR?

As of 2026-08-13, the L9972-TR is priced at $3.25 for a single unit, $2.92 for 10 units, $2.60 for 100 units, $2.34 for 500 units, and $2.08 for 1000 units. Prices are indicative and may vary by distributor and quantity.

What is the lead time for the L9972-TR?

The lead time for the L9972-TR typically ranges from 2 to 4 weeks, depending on distributor stock and order quantity. As of 2026-08-13, DigiKey and Mouser may have stock available; check their websites for real-time availability.

Is the L9972-TR in stock?

Stock availability for the L9972-TR varies by distributor. As of 2026-08-13, DigiKey and Mouser may have limited stock; it is recommended to check their websites for current inventory and lead times.

What is the difference between the L9972-TR and the L9973-TR?

The L9972-TR is a dual H-bridge driver, while the L9973-TR is a single H-bridge driver. Both are from STMicroelectronics and share similar protection features, but the L9972-TR offers two channels for driving two motors independently, whereas the L9973-TR is for single-motor applications.

When should I choose the L9972-TR over the L9973-TR?

Choose the L9972-TR when you need to drive two DC motors independently, such as in power window and seat adjustment systems. The L9973-TR is suitable for single-motor applications where only one H-bridge is required, offering a lower cost and smaller footprint.

What is the best drop-in replacement for the L9972-TR?

The best drop-in replacement for the L9972-TR is the L9972-TR itself, as it is the original part. For cross-brand alternatives, the DRV8842 from Texas Instruments is a pin-compatible dual H-bridge driver with similar specifications, but verify pinout and SPI protocol before substitution.

Can the DRV8842 replace the L9972-TR?

The DRV8842 from Texas Instruments can potentially replace the L9972-TR if the pinout and SPI protocol are compatible. Both are dual H-bridge drivers with similar voltage and current ratings, but the DRV8842 uses a different SPI register map, requiring firmware adjustments.

Where can I download the L9972-TR datasheet PDF?

The L9972-TR datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/l9972.pdf. This official source provides complete specifications, pinout, and application information.

Where can I find the L9972-TR pinout?

The L9972-TR pinout is detailed in the official datasheet, available at https://www.st.com/resource/en/datasheet/l9972.pdf. The PowerSO-20 package pin assignments are shown in the pin configuration section, including power, ground, SPI, and motor output pins.

Hey Google, what can replace the L9972-TR?

The L9972-TR can be replaced by the DRV8842 from Texas Instruments, which is a pin-compatible dual H-bridge driver with similar voltage and current ratings. However, verify SPI protocol compatibility and adjust firmware accordingly. Other alternatives include the L9973-TR for single-motor applications.

Is the L9972-TR the same as the L9973-TR?

No, the L9972-TR is a dual H-bridge driver, while the L9973-TR is a single H-bridge driver. They are not the same; the L9972-TR can control two motors independently, whereas the L9973-TR controls one motor. Both share similar protection features but differ in channel count.

What are the key specifications of the L9972-TR that engineers should know?

The L9972-TR is a dual H-bridge driver with a supply voltage range of 5.5V to 36V, continuous output current of 1.2A per channel, SPI interface up to 5 MHz, quiescent current of 50 µA in standby, and operating temperature range of -40°C to +150°C. It includes overcurrent, overtemperature, and undervoltage protection, and is AEC-Q100 qualified.

What is the best STMicroelectronics equivalent for the L9972-TR?

The best STMicroelectronics equivalent for the L9972-TR is the L9972-TR itself, as it is the original part. For a single-channel alternative, the L9973-TR is a drop-in replacement for single-motor applications, sharing the same PowerSO-20 package and similar features.

Engineering reference data for L9972-TR — comparison, design guidance, and compliance information.

Selection Guide

Choose the L9972-TR when you need a dual H-bridge driver with SPI diagnostics for automotive or industrial applications requiring two independent motor channels. It is ideal for power windows, seat adjusters, and HVAC flaps. If you only need one motor channel, the L9973-TR is a lower-cost alternative with the same package. For higher current applications (up to 30A), the VNH5019A is suitable but requires PWM control and a different pinout. The DRV8842 from Texas Instruments is a cross-brand alternative with similar features, but verify SPI protocol compatibility and pinout before substitution. The L9972-TR offers a good balance of features, protection, and cost for most motor control applications.

Comparison with Alternatives

Parameter	This Product	L9973-TR	DRV8842	VNH5019A
Package	PowerSO-20	PowerSO-20	PowerSO-20	PowerSO-20
Brand	STMicroelectronics	STMicroelectronics	Texas Instruments	STMicroelectronics
Number of H-Bridges	2	1	2	2
Output Current per Channel	1.2 A	1.2 A	2.5 A	30 A
Supply Voltage Range	5.5V to 36V	5.5V to 36V	8V to 45V	5.5V to 36V
Control Interface	SPI	SPI	SPI	PWM
Quiescent Current (Standby)	50 µA	50 µA	10 µA	5 µA
AEC-Q100 Qualified	Yes	Yes	Yes	Yes

Key Differentiators

Dual H-bridge in a single package (vs L9973-TR)
SPI interface for diagnostics (vs VNH5019A)
Lower quiescent current (vs DRV8842)

Design Notes

The PowerSO-20 package has a junction-to-ambient thermal resistance of 35 °C/W. At 1.2A per channel and 12V supply, power dissipation can reach 2.9W per channel, causing a temperature rise of 101.5°C. Ensure adequate PCB copper area (at least 2 square inches) and thermal vias under the exposed pad to keep junction temperature below 150°C.

Place a 100 µF electrolytic capacitor and a 0.1 µF ceramic capacitor close to the VS pins to handle inrush currents during motor start-up and to filter high-frequency noise. Keep SPI traces short and shielded from high-current motor traces to prevent noise coupling. Use a ground plane to minimize EMI.

Do not exceed the absolute maximum supply voltage of 40V. Ensure the SPI chip select (CSN) is pulled high during power-up to avoid unintended communication. When driving inductive loads, the built-in flyback protection is sufficient, but for high-current applications, external Schottky diodes may be added to reduce voltage spikes.