L9953SB - SPI Controlled 8-Channel Low-Side Driver | STMicroelectronics
MPN: L9953SB β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.25 | $3.25 |
| 10 | $2.95 | $29.50 |
| 100 | $2.65 | $265.00 |
| 500 | $2.4 | $1,200.00 |
| 1,000 | $2.2 | $2,200.00 |
Drop-in alternatives for L9953SB 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)
L9953SP
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)
L9953SB 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 (16-bit) |
| SPI Clock Frequency | 5 MHz (max) |
| Quiescent Current (Standby) | 10 Β΅A |
| Operating Temperature Range | -40Β°C to +150Β°C |
| Package | PowerSO-36 |
| Mounting Type | Surface Mount |
| Thermal Resistance (junction-to-ambient) | 35 Β°C/W |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit, Open-Load Detection |
| Process Technology | BCD (Bipolar-CMOS-DMOS) |
| RoHS Status | Compliant |
L9953SB 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 (4.5V to 5.5V) |
| Pin 11 | VS β Power supply voltage (4.5V to 28V) |
| 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) |
| Pin 17 | STATUS β Fault status output |
| Pin 18 | 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
L9953SB is suitable for 6 applications: Automotive Body Control Module, Industrial Automation Solenoid Control, LED Lighting Control, Relay Driving in Smart Home Systems, Motor Control in Power Tools, Aerospace Actuator Control.
Automotive Body Control Module
The L9953SB is ideal for automotive body control modules (BCMs) where it drives relays for lights, wipers, door locks, and other actuators. Its SPI interface allows the BCM microcontroller to control and diagnose each channel independently, enabling features like load fault detection and predictive maintenance. The device's wide operating temperature range and robust protection make it suitable for under-hood and interior applications. In a typical BCM, the L9953SB is placed on the PCB near the connector, with each output channel connected to a relay coil or LED. The SPI lines are routed to the MCU, and the diagnostic feedback is used to detect open or shorted loads. The device's low standby current helps minimize battery drain when the vehicle is off.
Recommended
Industrial Automation Solenoid Control
In industrial automation, the L9953SB is used to control solenoids and valves in pneumatic and hydraulic systems. Its 1.2A per channel output is sufficient for most solenoid valves, and the SPI interface enables precise timing and diagnostics. The device's overcurrent and overtemperature protection prevent damage in harsh industrial environments. In a typical application, the L9953SB is controlled by a PLC or industrial PC via SPI, with each channel driving a solenoid. The open-load detection feature is used to verify that the solenoid is connected and functioning. The device's wide supply voltage range allows it to operate from 24V industrial power supplies.
Recommended
LED Lighting Control
The L9953SB can be used for LED lighting control in automotive and industrial applications. Each channel can drive an LED string or a single high-power LED with PWM dimming. The SPI interface allows for individual channel control and diagnostics, such as open-load detection for faulty LEDs. The device's high switching speed supports PWM frequencies up to several kilohertz, enabling smooth dimming. In a typical LED lighting application, the L9953SB is used to switch LED strings in automotive tail lights or industrial indicator lights. The PWM signal is generated by the MCU and sent via SPI to configure the output channels. The device's thermal performance ensures reliable operation even when driving multiple LEDs at high currents.
Recommended
Relay Driving in Smart Home Systems
The L9953SB is suitable for smart home systems where it drives relays for lighting, heating, and appliance control. Its SPI interface allows a central hub to control multiple channels and receive diagnostic feedback. The device's low standby current is beneficial for always-on smart home devices. In a typical smart home application, the L9953SB is used in a central control unit to drive relays for various loads. The SPI interface is connected to a Wi-Fi or Zigbee module, enabling remote control and monitoring. The device's protection features ensure safe operation in residential environments.
Recommended
Motor Control in Power Tools
The L9953SB can be used in power tools to control brushed DC motors via low-side switching. Each channel can drive a motor with PWM speed control, and the SPI interface allows for diagnostics such as overcurrent detection. The device's robust protection features are essential for the harsh conditions of power tools. In a typical power tool application, the L9953SB is used to switch the motor on and off and to control its speed via PWM. The SPI interface is connected to a microcontroller that reads the trigger position and adjusts the PWM duty cycle. The device's thermal performance ensures reliable operation during prolonged use.
Recommended
Aerospace Actuator Control
The L9953SB is used in aerospace applications for controlling actuators in flight control systems and landing gear. Its high reliability and diagnostic capabilities are critical for safety-critical systems. The device's wide temperature range and protection features ensure operation in extreme conditions. In a typical aerospace application, the L9953SB is used to drive hydraulic or electromechanical actuators. The SPI interface provides real-time diagnostics, allowing the flight control computer to monitor actuator health. The device's low quiescent current is important for battery-powered emergency systems.
Recommended
Recommended Products Summary
Engineering reference data for L9953SB β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9953 | L9953SP | TLE6228GP | MC33879 |
|---|---|---|---|---|---|
| Package | PowerSO-36 | PowerSO-36 | PowerSO-36 | PowerSO-36 | PowerSO-36 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Infineon | NXP Semiconductors |
| Number of Channels | 8 | 8 | 8 | 8 | 8 |
| Output Current per Channel | 1.2 A | 1.2 A | 1.2 A | 0.5 A | 0.6 A |
| Supply Voltage (Power) | 4.5V to 28V | 4.5V to 28V | 4.5V to 28V | 4.5V to 32V | 5V to 32V |
| Interface | SPI (16-bit) | SPI (16-bit) | SPI (16-bit) | SPI (16-bit) | SPI (16-bit) |
| Quiescent Current (Standby) | 10 Β΅A | 10 Β΅A | 10 Β΅A | 15 Β΅A | 20 Β΅A |
| Operating Temperature Range | -40Β°C to +150Β°C | -40Β°C to +150Β°C | -40Β°C to +150Β°C | -40Β°C to +150Β°C | -40Β°C to +125Β°C |
Key Differentiators
- Higher output current per channel (1.2A) compared to TLE6228GP (0.5A) (vs TLE6228GP)
- Lower standby current (10Β΅A) compared to MC33879 (20Β΅A) (vs MC33879)
- Wider operating temperature range (-40Β°C to +150Β°C) compared to MC33879 (-40Β°C to +125Β°C) (vs MC33879)
Design Notes
Ensure adequate decoupling on the VCC and VS pins. Place a 100nF ceramic capacitor close to each supply pin and a 10Β΅F electrolytic capacitor on the VS pin to handle transient currents. The logic supply (VCC) should be decoupled with a 1Β΅F ceramic capacitor to prevent noise from affecting SPI communication.
The PowerSO-36 package has a thermal resistance of 35Β°C/W. For continuous operation at high currents, connect the exposed pad to a large copper area on the PCB to dissipate heat. Calculate the power dissipation as P = I^2 * RDS(on) * duty cycle, and ensure the junction temperature stays below 150Β°C.
Keep SPI lines (SCK, SI, SO, CS) short and shielded to minimize noise and crosstalk. Use series resistors (e.g., 22Ξ©) on the SPI lines to reduce ringing. Route the STATUS output to a pull-up resistor and connect it to an MCU interrupt pin for immediate fault detection.
Compliance Information
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Lead-free and halogen-free.
