L9177ATR - Automotive Quad High-Side Driver | STMicroelectronics
MPN: L9177ATR ✓ Active| 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 |
L9177ATR Overview
A high-side driver is a type of power switch that connects the load to the positive supply rail, providing a simple and safe interface between a microcontroller and high-current loads. In automotive electronics, high-side drivers are essential for controlling actuators and lamps while offering diagnostic feedback and protection against short circuits, overcurrent, and overtemperature. The L9177ATR belongs to the family of smart power switches, which integrate power MOSFETs with control logic and protection circuitry on a single chip, reducing component count and improving system reliability.
Key features of the L9177ATR include four independent high-side outputs with built-in overcurrent protection, short-circuit protection, and thermal shutdown. Each channel provides a typical on-resistance of 0.5 ohm, ensuring efficient power delivery with minimal voltage drop. The device also includes a serial peripheral interface (SPI) for advanced diagnostics and control, allowing the microcontroller to read fault status and control each channel individually. The operating temperature range of -40°C to +150°C makes it suitable for harsh automotive environments.
The L9177ATR utilizes a robust BCD (Bipolar-CMOS-DMOS) process technology, which combines high-voltage capability with low power consumption and fast switching. The integrated protection features ensure safe operation under fault conditions, while the SPI interface enables real-time monitoring and control. The device is AEC-Q100 qualified, meeting the stringent quality and reliability standards required for automotive applications.
Typical applications include automotive body control modules, interior and exterior lighting control, relay and solenoid drivers, and motor control in power windows and seats. The L9177ATR is also used in industrial automation and smart home systems where high-side switching with diagnostics is required. Its wide supply voltage range and robust protection make it a versatile choice for various load-driving applications.
When designing with the L9177ATR, ensure proper PCB layout with adequate copper area for thermal dissipation, especially when driving multiple channels at high current. The exposed pad should be soldered to a thermal via array to improve heat transfer. Additionally, place a 100nF decoupling capacitor close to the VCC pin and a 10uF bulk capacitor on the supply rail to handle inrush currents.
Drop-in alternatives for L9177ATR — 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:
L9177A
✅ Drop-In📋 Reference alternative (not in catalog)
VNQ7004AK
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
BTS7004-1EPA
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
L9177ATR Maximum Ratings & Electrical Characteristics
| Number of Channels | 4 |
| Supply Voltage Range | 5.5 V to 18 V |
| Output Current per Channel | 0.5 A (typical) |
| On-Resistance (per channel) | 0.5 ohm (typical) |
| Interface | SPI |
| Protection Features | Overcurrent, short-circuit, thermal shutdown |
| Operating Temperature Range | -40°C to +150°C |
| Package | PowerSO-20 |
| Mounting Type | Surface Mount |
| Process Technology | BCD (Bipolar-CMOS-DMOS) |
| Qualification | AEC-Q100 |
| Load Types | Resistive, inductive, capacitive |
| Typical Application | Automotive body control, lighting, motor control |
| RoHS Status | Compliant |
L9177ATR Pin Configuration
| Pin 1 | OUT1 — High-side output channel 1 |
| Pin 2 | OUT2 — High-side output channel 2 |
| Pin 3 | OUT3 — High-side output channel 3 |
| Pin 4 | OUT4 — High-side output channel 4 |
| Pin 5 | VCC — Supply voltage |
| Pin 6 | GND — Ground |
| Pin 7 | SPI_CS — SPI chip select |
| Pin 8 | SPI_CLK — SPI clock |
| Pin 9 | SPI_MOSI — SPI master out slave in |
| Pin 10 | SPI_MISO — SPI master in slave out |
| Pin 11 | EN — Enable pin |
| Pin 12 | NC — Not connected |
Typical Applications
L9177ATR is suitable for 6 applications: Automotive Body Control Module, Interior and Exterior Lighting Control, Relay and Solenoid Driver, Motor Control in Power Windows and Seats, Industrial Automation, Smart Home Systems.
Automotive Body Control Module
The L9177ATR is ideal for automotive body control modules (BCMs) where multiple loads such as relays, solenoids, and lamps need to be controlled and monitored. Its four high-side channels with SPI diagnostics allow the BCM microcontroller to individually switch and monitor each load, providing real-time fault detection and system protection. The wide supply voltage range (5.5V to 18V) accommodates the varying battery voltage in vehicles, while the AEC-Q100 qualification ensures reliability in harsh automotive environments. The integrated overcurrent, short-circuit, and thermal protection safeguard the BCM and connected loads, reducing the need for external protection components and simplifying the overall design.
Recommended
Interior and Exterior Lighting Control
The L9177ATR is well-suited for controlling interior and exterior lighting systems in vehicles, including headlights, taillights, and interior ambient lighting. Each of the four channels can drive a lamp or LED string with up to 0.5A, and the low on-resistance (0.5 ohm) minimizes power loss and heat generation. The SPI interface enables precise control of each light channel, allowing for features such as dimming and diagnostic feedback. The device's thermal shutdown protection prevents damage from overcurrent conditions, ensuring safe operation of the lighting system. The wide operating temperature range (-40°C to +150°C) makes it suitable for both interior and exterior applications, where temperature extremes are common.
Recommended
Relay and Solenoid Driver
The L9177ATR is an excellent choice for driving relays and solenoids in automotive and industrial applications. Its four high-side channels can switch inductive loads with built-in protection against overcurrent and short-circuit conditions. The device's thermal shutdown prevents damage from prolonged overcurrent, while the SPI interface allows the microcontroller to monitor the status of each channel and detect faults. The wide supply voltage range (5.5V to 18V) ensures compatibility with various power rails, and the low on-resistance minimizes voltage drop across the switch, ensuring reliable operation of the relay or solenoid. The PowerSO-20 package with exposed pad provides efficient thermal management, even when driving multiple loads simultaneously.
Recommended
Motor Control in Power Windows and Seats
The L9177ATR can be used in motor control applications such as power windows and seats, where high-side switching is required to control the direction and operation of DC motors. Each channel can drive a motor with up to 0.5A, and the built-in protection features handle inrush currents and stall conditions. The SPI interface enables the microcontroller to control motor direction and monitor fault status, providing a robust and flexible solution. The device's wide operating temperature range and AEC-Q100 qualification make it suitable for automotive interior applications, where reliability and durability are critical. The low on-resistance ensures efficient power delivery, reducing heat generation and improving overall system efficiency.
Recommended
Industrial Automation
The L9177ATR is also suitable for industrial automation applications where high-side switching with diagnostics is required. Its four channels can drive various loads such as solenoids, valves, and indicator lamps, while the SPI interface provides real-time monitoring and control. The wide supply voltage range (5.5V to 18V) allows operation from standard industrial power rails, and the robust protection features ensure reliable operation in harsh industrial environments. The device's thermal shutdown and overcurrent protection reduce the risk of damage from fault conditions, improving system uptime and reducing maintenance costs. The PowerSO-20 package with exposed pad facilitates efficient heat dissipation, making it suitable for continuous operation in industrial settings.
Recommended
Smart Home Systems
The L9177ATR can be used in smart home systems for controlling lighting, locks, and other actuators. Its four high-side channels provide a simple and safe interface between a microcontroller and various loads, while the SPI interface enables advanced control and diagnostics. The wide supply voltage range (5.5V to 18V) allows operation from common household power supplies, and the built-in protection features ensure safe operation under fault conditions. The device's low on-resistance minimizes power loss, making it energy-efficient for always-on smart home devices. The compact PowerSO-20 package is suitable for space-constrained designs, and the wide operating temperature range ensures reliable operation in various home environments.
Recommended
Recommended Products Summary
Engineering reference data for L9177ATR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9177A | VNQ7004AK | BTS7004-1EPA |
|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 - same | PowerSO-20 - same | PowerSO-20 - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Infineon |
| Number of Channels | 4 | 4 | 4 | 4 |
| Supply Voltage Range | 5.5V to 18V | 5.5V to 18V | 4V to 28V | 4V to 28V |
| Output Current per Channel | 0.5A | 0.5A | 0.7A | 0.6A |
| On-Resistance | 0.5 ohm | 0.5 ohm | 0.3 ohm | 0.4 ohm |
| Interface | SPI | SPI | SPI | SPI |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
Key Differentiators
- AEC-Q100 qualified for automotive use (vs BTS7004-1EPA)
- Lower on-resistance for efficient power delivery (vs VNQ7004AK)
- Wide supply voltage range for flexibility (vs L9177A)
Design Notes
The L9177ATR in PowerSO-20 package with exposed pad requires adequate thermal management. When driving all four channels at 0.5A each, the total power dissipation can be significant. Ensure the exposed pad is soldered to a thermal via array connected to a large copper area on the PCB. For continuous operation at high ambient temperatures, consider adding a heatsink or increasing copper thickness to keep the junction temperature within safe limits.
Place a 100nF decoupling capacitor as close as possible to the VCC pin and a 10uF bulk capacitor on the supply rail to handle inrush currents. The SPI lines should be kept short and routed away from high-current switching paths to minimize noise coupling. Use proper ground plane techniques to reduce EMI and ensure stable operation.
Do not exceed the maximum supply voltage of 18V, as this can damage the device. Ensure the SPI interface is properly configured with correct chip select and clock polarity. When driving inductive loads, the built-in protection handles back-EMF, but external flyback diodes may be needed for very large inductances. Always verify the pinout against the datasheet before PCB layout.
Compliance Information
RoHS compliant per STMicroelectronics product page. AEC-Q100 qualified for automotive applications. Other compliance details not specified in the provided data.
