L9955-TR - SPI Controlled 8-Channel Low-Side Driver | STMicroelectronics
MPN: L9955-TR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.15 | $1,575.00 |
| 1,000 | $2.7 | $2,700.00 |
Drop-in alternatives for L9955-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:
L9955
β Drop-Inπ Reference alternative (not in catalog)
TLE6228GP
β Drop-Inπ Reference alternative (not in catalog)
MC33879
β Drop-Inπ Reference alternative (not in catalog)
L9955-TR Maximum Ratings & Electrical Characteristics
| Number of Channels | 8 |
| Output Type | Low-Side Driver |
| Supply Voltage (Logic) | 4.5 V to 5.5 V |
| Supply Voltage (Power Stage) | Up to 40 V |
| Output Current per Channel | 1.2 A continuous, 2 A peak |
| SPI Interface | Yes, up to 5 MHz |
| Diagnostic Readback | 16-bit |
| Protection Features | Overcurrent, Overtemperature, Open-Load |
| Operating Temperature Range | -40Β°C to +150Β°C |
| Package | PowerSO-36 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| AEC-Q100 Qualified | Yes |
| Output Leakage Current | [DATA_NEEDED: Output Leakage Current] |
| Switching Frequency | [DATA_NEEDED: Switching Frequency] |
L9955-TR Pin Configuration
| Pin 1 | OUT1 β Low-side driver output channel 1 |
| Pin 2 | OUT2 β Low-side driver output channel 2 |
| Pin 3 | OUT3 β Low-side driver output channel 3 |
| Pin 4 | OUT4 β Low-side driver output channel 4 |
| Pin 5 | OUT5 β Low-side driver output channel 5 |
| Pin 6 | OUT6 β Low-side driver output channel 6 |
| Pin 7 | OUT7 β Low-side driver output channel 7 |
| Pin 8 | OUT8 β Low-side driver output channel 8 |
| Pin 9 | GND β Ground |
| Pin 10 | VCC β Logic supply voltage (4.5V to 5.5V) |
| Pin 11 | VS β Power stage supply voltage (up to 40V) |
| Pin 12 | SCK β SPI clock input |
| Pin 13 | SI β SPI data input |
| Pin 14 | SO β SPI data output |
| Pin 15 | CS β SPI chip select (active low) |
| Pin 16 | RST β Reset input (active low) |
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
L9955-TR is suitable for 6 applications: Automotive Body Control Module, Industrial Automation, Smart Actuator Systems, LED Lighting Control, Relay and Solenoid Driving, Safety-Critical Systems.
Automotive Body Control Module
The L9955-TR is ideal for automotive body control modules, where it drives exterior lighting, wiper motors, and door locks. Its 8 channels can control multiple loads, while the SPI interface provides real-time diagnostics for fault detection. The device's AEC-Q100 qualification ensures reliability in harsh automotive environments. With a supply voltage up to 40V, it can handle load dump transients, and the overcurrent protection prevents damage to the module. The low-side driver topology is well-suited for grounding loads, and the integrated charge pump ensures efficient switching even at low battery voltages. The SPI interface allows the microcontroller to monitor each channel's status, enabling predictive maintenance and reducing warranty costs. The PowerSO-36 package with exposed thermal pad facilitates heat dissipation, ensuring stable operation under high ambient temperatures.
Recommended
Industrial Automation
In industrial automation, the L9955-TR is used to control solenoids in pneumatic systems and actuators in robotic arms. Its high current capability (1.2A per channel) and diagnostic features make it suitable for safety-critical applications. The SPI interface enables centralized control and monitoring, reducing wiring complexity. The device's wide operating temperature range (-40Β°C to +150Β°C) ensures reliable operation in factory environments. The overcurrent and overtemperature protection prevent damage to the device and connected loads, minimizing downtime. The low-side driver configuration is compatible with standard industrial loads, and the integrated charge pump allows operation at low supply voltages. The PowerSO-36 package is robust and suitable for industrial PCBs, and the exposed thermal pad aids in heat dissipation, ensuring long-term reliability.
Recommended
Smart Actuator Systems
The L9955-TR is well-suited for smart actuator systems, where it drives motors and solenoids with precise control and diagnostics. Its SPI interface allows for real-time monitoring of each channel, enabling predictive maintenance and fault detection. The device's 8 channels can control multiple actuators, reducing component count and PCB area. The high current capability and wide supply voltage range make it versatile for various actuator types. The integrated protection features ensure safe operation under fault conditions, such as short circuits or overtemperature. The AEC-Q100 qualification makes it suitable for automotive actuator systems, while the PowerSO-36 package provides excellent thermal performance. The low-side driver topology is ideal for grounding loads, and the charge pump ensures efficient switching at low voltages.
Recommended
LED Lighting Control
The L9955-TR can be used for LED lighting control, particularly in automotive exterior lighting such as tail lights and turn signals. Each channel can sink up to 1.2A, sufficient for driving multiple LEDs in series. The SPI interface allows for individual channel control and diagnostics, enabling features like dynamic turn signals and fault detection. The device's wide supply voltage range accommodates automotive battery voltage variations, and the overcurrent protection prevents LED damage. The low-side driver configuration is compatible with common LED circuits, and the integrated charge pump ensures efficient switching. The AEC-Q100 qualification ensures reliability in automotive lighting applications, and the PowerSO-36 package provides adequate thermal management for LED loads.
Recommended
Relay and Solenoid Driving
The L9955-TR is ideal for driving relays and solenoids in various applications, including automotive and industrial systems. Its high current capability (1.2A per channel) can drive most relays and solenoids directly, eliminating the need for external transistors. The SPI interface provides diagnostics for each channel, allowing detection of open-load or short-circuit conditions. The device's protection features, such as overcurrent and overtemperature, ensure safe operation. The wide supply voltage range (up to 40V) makes it suitable for automotive and industrial power rails. The low-side driver topology is standard for relay and solenoid control, and the integrated charge pump ensures reliable switching. The PowerSO-36 package is robust and suitable for high-current applications.
Recommended
Safety-Critical Systems
The L9955-TR is suitable for safety-critical systems due to its comprehensive diagnostic capabilities and AEC-Q100 qualification. The SPI interface provides real-time monitoring of each channel, enabling detection of faults such as open-load, short-to-ground, and overtemperature. This allows the system to respond quickly to failures, enhancing safety. The device's overcurrent and overtemperature protection prevent damage to the device and connected loads. The wide operating temperature range (-40Β°C to +150Β°C) ensures reliable operation in extreme conditions. The low-side driver topology is commonly used in safety systems, and the integrated charge pump ensures efficient switching. The PowerSO-36 package provides excellent thermal performance, and the device's robust design meets automotive safety standards.
Recommended
Recommended Products Summary
Engineering reference data for L9955-TR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9955 | TLE6228GP | MC33879 |
|---|---|---|---|---|
| Package | PowerSO-36 | PowerSO-36 | PowerSO-36 | PowerSO-36 |
| Brand | STMicroelectronics | STMicroelectronics | Infineon | NXP Semiconductors |
| Number of Channels | 8 | 8 | 8 | 8 |
| Output Current per Channel | 1.2 A continuous | 1.2 A continuous | [DATA_NEEDED] | [DATA_NEEDED] |
| Supply Voltage (Power Stage) | Up to 40 V | Up to 40 V | [DATA_NEEDED] | [DATA_NEEDED] |
| SPI Interface | Yes, up to 5 MHz | Yes, up to 5 MHz | Yes | Yes |
| Diagnostic Readback | 16-bit | 16-bit | [DATA_NEEDED] | [DATA_NEEDED] |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated 16-bit diagnostic readback (vs TLE6228GP)
- AEC-Q100 qualified (vs MC33879)
- High output current capability (vs TLE6228GP)
Design Notes
The L9955-TR can dissipate significant power when driving high currents. Ensure the exposed thermal pad on the PowerSO-36 package is soldered to a large copper area on the PCB to facilitate heat dissipation. For continuous operation at 1.2A per channel, calculate the power dissipation and verify the junction temperature stays within the specified range.
Place decoupling capacitors (e.g., 100nF ceramic) close to the VCC and VS pins to filter high-frequency noise. For the SPI lines, use series resistors (e.g., 33Ξ©) to reduce ringing and ensure signal integrity. Keep the SPI traces short and avoid routing them near high-current switching paths.
Do not exceed the maximum supply voltage of 40V on the VS pin. Ensure the logic supply (VCC) is within 4.5V to 5.5V to avoid malfunction. When driving inductive loads, use freewheeling diodes or the device's internal clamp to prevent voltage spikes. Also, ensure the SPI chip select (CS) is properly pulled high when not in use to avoid unintended communication.
Compliance Information
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Halogen-free status not specified in available data.
