L9957-TR - High Voltage High-Side Driver | STMicroelectronics | SO-8
MPN: L9957-TR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.85 | $425.00 |
| 1,000 | $0.75 | $750.00 |
Drop-in alternatives for L9957-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:
L9957-TR-LF
✅ Drop-In📋 Reference alternative (not in catalog)
L9957
✅ Drop-In✓ 99,999 In Stock
$1.85 / Unit
View Datasheet →L9957D
✅ Drop-In📋 Reference alternative (not in catalog)
VNQ6004SA-E
⚡ Same Package✓ 99,999 In Stock
$2.3 / Unit
View Datasheet →L9957-TR Maximum Ratings & Electrical Characteristics
| Configuration | High-Side |
| Supply Voltage Range | 10 V to 18 V |
| High Voltage Rail | 450 V |
| Peak Output Current | 500 mA |
| Source Current Capability | 500 mA |
| Sink Current Capability | 500 mA |
| Switching Time (Rise/Fall) | 100 ns with 2 nF load |
| dV/dt Immunity | ±50 V/nsec |
| Operating Temperature Range | -40°C to +125°C |
| Package | SO-8 (SOIC-8) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Technology | BCD "OFF-LINE" |
| Number of Channels | 1 |
| Input Type | Non-Inverting |
L9957-TR Pin Configuration
| Pin 1 | IN — Input control signal |
| Pin 2 | GND — Ground |
| Pin 3 | GND — Ground |
| Pin 4 | OUT — High-side output |
| Pin 5 | OUT — High-side output |
| Pin 6 | VCC — Supply voltage (10V to 18V) |
| Pin 7 | VCC — Supply voltage (10V to 18V) |
| Pin 8 | NC — 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
L9957-TR is suitable for 6 applications: Automotive Body Control Module, Industrial Motor Control, Power Distribution Systems, LED Lighting Control, Relay and Solenoid Drivers, Programmable Logic Controllers (PLCs).
Automotive Body Control Module
The L9957-TR is used in automotive body control modules to drive high-side loads such as exterior lighting, fuel pumps, and relays. Its high voltage rail (450V) and wide temperature range (-40°C to +125°C) make it suitable for the harsh automotive environment. The fast switching time (100ns) enables efficient PWM control for lighting dimming and motor speed control. The high dV/dt immunity (±50V/nsec) ensures reliable operation in the presence of electrical noise from the vehicle's electrical system. In a typical body control module, the L9957-TR is placed between the microcontroller and the load, providing a robust interface that protects the low-voltage logic from high-voltage transients. The device's 500mA current capability is sufficient for driving small relays and lamps, while its high voltage rating allows it to handle load dump and other transient conditions. Designers should ensure adequate PCB cooling for the SO-8 package when driving loads near the maximum current rating.
Recommended
Industrial Motor Control
In industrial motor control applications, the L9957-TR is used to drive high-side switches for motors, solenoids, and valves. Its high voltage capability (450V) allows it to operate directly from industrial power rails, while the 500mA source/sink current is suitable for small to medium loads. The fast switching time (100ns) enables high-frequency PWM for precise motor speed control. The device's dV/dt immunity (±50V/nsec) ensures reliable operation in industrial environments with high electromagnetic interference. In a typical motor control circuit, the L9957-TR is used to switch the high-side of a DC motor, with a freewheeling diode across the motor to protect against inductive kickback. The device's thermal performance must be considered, as the SO-8 package has limited heat dissipation. For higher current applications, an external MOSFET may be required. The L9957-TR is also suitable for driving solenoids in pneumatic and hydraulic systems, where its fast switching and high voltage rating are beneficial.
Recommended
Power Distribution Systems
The L9957-TR is used in power distribution systems to switch high-side loads in a controlled manner. Its high voltage rail (450V) makes it suitable for applications where the supply voltage can be high, such as in industrial power distribution or automotive power management. The device's 500mA current capability allows it to drive moderate loads, and its fast switching time (100ns) enables efficient power switching. The high dV/dt immunity (±50V/nsec) ensures reliable operation in environments with voltage transients. In a power distribution system, the L9957-TR can be used to switch power to different subsystems, providing a centralized control point. The device's SO-8 package is compact, allowing for high-density PCB layouts. Designers should ensure that the input supply voltage is within the specified range (10V to 18V) and that adequate decoupling is provided. The device's thermal performance should be evaluated for the expected load current and ambient temperature.
Recommended
LED Lighting Control
The L9957-TR is used in LED lighting control applications to switch high-side LED strings. Its fast switching time (100ns) enables high-frequency PWM dimming without visible flicker. The 500mA current capability is sufficient for driving a string of LEDs, and the high voltage rail (450V) allows it to handle LED strings with high forward voltage. The device's dV/dt immunity (±50V/nsec) ensures reliable operation in environments with electrical noise. In a typical LED lighting application, the L9957-TR is used to switch the high-side of an LED string, with a current-limiting resistor or LED driver to control the current. The device's SO-8 package is compact, making it suitable for space-constrained lighting fixtures. Designers should ensure that the LED string's current does not exceed the device's 500mA rating and that adequate thermal management is provided for the SO-8 package.
Recommended
Relay and Solenoid Drivers
The L9957-TR is used to drive relays and solenoids in various applications, including automotive, industrial, and consumer electronics. Its high voltage rail (450V) allows it to handle the inductive kickback from relays and solenoids, while the 500mA current capability is sufficient for most small relays and solenoids. The fast switching time (100ns) ensures quick actuation, and the high dV/dt immunity (±50V/nsec) provides robustness against voltage transients. In a typical relay driver circuit, the L9957-TR is used to switch the high-side of the relay coil, with a freewheeling diode across the coil to protect against inductive kickback. The device's SO-8 package is compact, making it suitable for space-constrained applications. Designers should ensure that the relay coil's current does not exceed the device's 500mA rating and that adequate thermal management is provided.
Recommended
Programmable Logic Controllers (PLCs)
The L9957-TR is used in PLCs to drive high-side loads such as solenoids, valves, and indicator lamps. Its high voltage rail (450V) allows it to operate from industrial power supplies, and the 500mA current capability is sufficient for driving small loads. The fast switching time (100ns) enables high-speed control, and the high dV/dt immunity (±50V/nsec) ensures reliable operation in industrial environments. In a typical PLC output module, the L9957-TR is used to switch the high-side of a load, with the control signal coming from the PLC's microcontroller. The device's SO-8 package is compact, allowing for high-density output modules. Designers should ensure that the load current does not exceed the device's 500mA rating and that adequate thermal management is provided. The device's wide temperature range (-40°C to +125°C) makes it suitable for industrial environments.
Recommended
Recommended Products Summary
Engineering reference data for L9957-TR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9957-TR-LF | L9957 | L9957D |
|---|---|---|---|---|
| Package | SO-8 | SO-8 | SO-8 | SO-8 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Configuration | High-Side | High-Side | High-Side | High-Side |
| Supply Voltage Range | 10 V to 18 V | 10 V to 18 V | 10 V to 18 V | [DATA_NEEDED] |
| High Voltage Rail | 450 V | 450 V | 450 V | [DATA_NEEDED] |
| Peak Output Current | 500 mA | 500 mA | 500 mA | [DATA_NEEDED] |
| Switching Time | 100 ns | 100 ns | 100 ns | [DATA_NEEDED] |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | [DATA_NEEDED] |
Key Differentiators
- High voltage rail of 450V (vs L9957-TR-LF)
- Fast switching time of 100ns (vs L9957D)
- Tape and reel packaging (vs L9957)
Design Notes
The SO-8 package has limited thermal dissipation capability. For applications with continuous output current near the 500mA maximum, ensure adequate PCB copper area and thermal vias to keep the junction temperature within the specified range. The thermal resistance of the SO-8 package is typically around 100°C/W, so for a power dissipation of 1W, the junction temperature will rise 100°C above ambient. Consider derating the output current at high ambient temperatures.
Place a 100nF ceramic capacitor close to the VCC pin and a 10uF electrolytic capacitor nearby to decouple the supply. The high-side output should have a freewheeling diode to protect against inductive kickback when driving relays or solenoids. Ensure the PCB traces for the high-voltage rail have adequate clearance to prevent arcing.
Do not exceed the absolute maximum ratings, particularly the high voltage rail of 450V. Ensure the input control signal is within the specified logic levels. The device is not designed for parallel operation to increase current capability. Always verify the pinout with the datasheet before PCB layout.
Compliance Information
The L9957-TR is not explicitly marked as RoHS compliant in the provided data. The L9957-TR-LF variant is lead-free. Compliance information should be verified with the manufacturer.
