L9953XP - SPI Controlled 8-Channel Low-Side Driver | STMicroelectronics
MPN: L9953XP β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.25 | $6.25 |
| 10 | $5.63 | $56.30 |
| 100 | $5.01 | $501.00 |
| 500 | $4.51 | $2,255.00 |
| 1,000 | $4.06 | $4,060.00 |
Drop-in alternatives for L9953XP 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:
L9953
β Drop-Inπ Reference alternative (not in catalog)
L9953XP-TR
β Drop-Inπ Reference alternative (not in catalog)
MC33879
β Drop-Inπ Reference alternative (not in catalog)
TLE6228
β Drop-Inπ Reference alternative (not in catalog)
L9953XP Maximum Ratings & Electrical Characteristics
| Number of Channels | 8 |
| Output Type | Low-side |
| Maximum Output Current per Channel | 1.2 A |
| Supply Voltage (Logic) | 4.5 V to 5.5 V |
| Supply Voltage (Power) | 4.5 V to 28 V |
| Interface | SPI (up to 5 MHz) |
| Overcurrent Threshold | 2.4 A (typical) |
| Quiescent Current (Sleep Mode) | 10 Β΅A (max) |
| Operating Temperature Range | -40Β°C to +150Β°C |
| Package | PowerSO-36 |
| Mounting Type | Surface Mount |
| AEC-Q100 Qualification | Grade 1 |
| RoHS Status | Compliant |
| Fail-Safe Input | Yes |
| PWM Capability | Yes (per channel) |
L9953XP 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 | OUT5 β Low-side output channel 5 |
| Pin 6 | OUT6 β Low-side output channel 6 |
| Pin 7 | OUT7 β Low-side output channel 7 |
| Pin 8 | OUT8 β Low-side output channel 8 |
| Pin 9 | GND β Ground |
| Pin 10 | VCC β Logic supply voltage (5V) |
| Pin 11 | VS β Power supply voltage (battery) |
| Pin 12 | SCK β SPI clock input |
| Pin 13 | SI β SPI data input |
| Pin 14 | SO β SPI data output |
| Pin 15 | CSN β SPI chip select (active low) |
| Pin 16 | FSI β Fail-safe input (active low) |
| Pin 17 | RST β Reset input (active low) |
| Pin 18 | PWM β PWM input for all channels |
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
L9953XP is suitable for 6 applications: Automotive Body Control Module, Industrial PLC Output Stage, Relay Driver for Power Distribution, LED Lighting Control, Solenoid and Valve Control, Smart Junction Box.
Automotive Body Control Module
The L9953XP is ideal for automotive body control modules (BCMs) where it drives exterior and interior lighting, relays, and solenoids. Its SPI interface allows a central microcontroller to manage multiple outputs with minimal wiring, while the AEC-Q100 Grade 1 qualification ensures reliable operation in harsh automotive environments. The device's overcurrent and overtemperature protection prevent damage to the module and loads, and the fail-safe input provides a hardware shutdown path in case of microcontroller failure. With 1.2 A per channel, it can directly drive most automotive bulbs and relays without external drivers, simplifying the BCM design and reducing component count.
Recommended
Industrial PLC Output Stage
In industrial programmable logic controllers (PLCs), the L9953XP serves as an output stage for driving solenoids, valves, and indicator lamps. Its 4.5 V to 28 V power supply range accommodates various industrial voltage rails, and the SPI interface enables efficient communication with the PLC's CPU. The device's built-in protection against overcurrent and overtemperature ensures robust operation in factory environments, while the PWM capability allows proportional control of valves for precise flow regulation. The PowerSO-36 package with exposed pad facilitates heat dissipation, making it suitable for continuous operation in control cabinets.
Recommended
Relay Driver for Power Distribution
The L9953XP is well-suited for driving relays in power distribution systems, such as those found in smart junction boxes and fuse boxes. Each channel can drive a relay coil directly, with the built-in freewheeling protection handling the inductive kickback. The SPI interface allows the system to monitor relay status and detect faults, improving diagnostic capabilities. The device's low sleep current is beneficial for vehicles that need to minimize battery drain when parked. With its wide operating temperature range, the L9953XP can be placed near the engine compartment where temperatures are elevated.
Recommended
LED Lighting Control
The L9953XP can be used to control LED lighting in automotive and industrial applications. Each channel can drive an LED string or module with PWM dimming, enabling dynamic lighting effects and energy savings. The device's overcurrent protection prevents damage from LED faults, and the SPI interface allows for individual channel control and diagnostics. The wide supply voltage range accommodates both 12V and 24V systems, making it versatile for various lighting applications. The compact PowerSO-36 package helps reduce PCB space in space-constrained lighting modules.
Recommended
Solenoid and Valve Control
The L9953XP is ideal for controlling solenoids and valves in automotive and industrial systems, such as transmission control, fuel injection, and pneumatic actuators. Its 1.2 A per channel output can drive most solenoid coils directly, and the built-in freewheeling protection manages the inductive load. The SPI interface enables precise timing and sequencing of multiple solenoids, which is critical for applications like automatic transmissions. The device's fail-safe input provides a hardware shutdown in case of microcontroller failure, enhancing system safety. The AEC-Q100 Grade 1 qualification ensures reliable operation in high-temperature environments.
Recommended
Smart Junction Box
In smart junction boxes, the L9953XP provides a centralized solution for controlling multiple loads such as lights, motors, and heaters. Its SPI interface allows a central controller to manage all outputs, reducing wiring complexity and enabling advanced diagnostics. The device's protection features prevent damage from short circuits and overloads, improving system reliability. The low sleep current is essential for reducing battery drain in vehicles, and the wide operating temperature range makes it suitable for under-hood applications. The PowerSO-36 package with exposed pad ensures efficient heat dissipation in the confined space of a junction box.
Recommended
Recommended Products Summary
Engineering reference data for L9953XP β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9953 | L9953XP-TR | MC33879 | TLE6228 |
|---|---|---|---|---|---|
| Package | PowerSO-36 | PowerSO-36 | PowerSO-36 | PowerSO-36 | PowerSO-36 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors | Infineon |
| Number of Channels | 8 | 8 | 8 | 8 | 8 |
| Output Current per Channel | 1.2 A | 1.2 A | 1.2 A | 0.6 A | 0.5 A |
| Supply Voltage (Power) | 4.5 V to 28 V | 4.5 V to 28 V | 4.5 V to 28 V | 5.5 V to 26 V | 4.5 V to 32 V |
| SPI Interface | Yes (up to 5 MHz) | Yes (up to 5 MHz) | Yes (up to 5 MHz) | Yes (up to 5 MHz) | Yes (up to 5 MHz) |
| CRC Protection | Yes | No | Yes | No | No |
| AEC-Q100 Qualification | Grade 1 | No | Grade 1 | Grade 1 | Grade 1 |
Key Differentiators
- CRC protection on SPI interface (vs L9953)
- Higher output current per channel (vs MC33879)
- AEC-Q100 Grade 1 qualification (vs L9953)
Design Notes
The L9953XP in PowerSO-36 package has an exposed pad that must be soldered to a large copper area on the PCB for effective heat dissipation. For continuous operation at 1.2 A per channel on all eight channels, the total power dissipation can reach several watts. Ensure the PCB copper area is at least 2 square inches to keep the junction temperature below the maximum rating. Use thermal vias to connect the exposed pad to inner and bottom layers for improved thermal performance.
Place a 100 nF ceramic capacitor close to the VCC pin and a 10 Β΅F electrolytic capacitor near the VS pin to decouple the power supply. The SPI lines (SCK, SI, SO, CSN) should be routed with controlled impedance and kept short to minimize noise. Add series resistors (e.g., 22 Ξ©) on the SPI lines to reduce ringing. The fail-safe input (FSI) should be pulled up to VCC with a 10 kΞ© resistor and connected to a watchdog output for robust system monitoring.
Do not exceed the absolute maximum ratings for VS (28 V) and VCC (5.5 V). Ensure the SPI communication is properly initialized with the correct CRC settings to avoid false diagnostics. When driving inductive loads, the built-in freewheeling protection handles back-EMF, but external flyback diodes may be needed for very large inductances. Avoid floating the FSI pin; always tie it to a defined logic level to prevent unintended shutdown.
Compliance Information
RoHS compliant per STMicroelectronics product page. AEC-Q100 Grade 1 qualified. Halogen-free status not specified in available data.
