L9779WD-SPI-TR - Automotive SPI Driver IC | STMicroelectronics
MPN: L9779WD-SPI-TR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.25 | $3.25 |
| 10 | $2.95 | $29.50 |
| 100 | $2.45 | $245.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.85 | $1,850.00 |
Drop-in alternatives for L9779WD-SPI-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:
L9779WDM-TR
β Drop-Inβ 99,999 In Stock
$1.85 / Unit
View Datasheet βL9779WD13TR
β Drop-Inπ Reference alternative (not in catalog)
MC33996
β Drop-Inπ Reference alternative (not in catalog)
TLE6228
β Drop-Inπ Reference alternative (not in catalog)
L9779WD-SPI-TR Maximum Ratings & Electrical Characteristics
| Supply Voltage Range | 4.5 V to 40 V |
| Number of Outputs | 8 (configurable high-side/low-side) |
| Output Current per Channel | 0.5 A (typical) |
| SPI Clock Frequency | 5 MHz (max) |
| Operating Temperature Range | -40Β°C to +150Β°C |
| Standby Current | 10 Β΅A (typical) |
| Package | PowerSSO-36 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| AEC-Q100 Qualified | Yes |
| Diagnostic Interface | SPI with fault readback |
| Protection Features | Over-current, over-temperature, short-circuit |
| Fail-Safe Mode | Yes (outputs off on SPI loss) |
| Output Configuration | High-side and low-side |
| ESD Protection | 8 kV HBM |
L9779WD-SPI-TR Pin Configuration
| Pin 1 | OUT1 β Output channel 1 |
| Pin 2 | OUT2 β Output channel 2 |
| Pin 3 | OUT3 β Output channel 3 |
| Pin 4 | OUT4 β Output channel 4 |
| Pin 5 | OUT5 β Output channel 5 |
| Pin 6 | OUT6 β Output channel 6 |
| Pin 7 | OUT7 β Output channel 7 |
| Pin 8 | OUT8 β Output channel 8 |
| Pin 9 | GND β Ground |
| Pin 10 | VCC β Supply voltage |
| Pin 11 | SCK β SPI clock |
| Pin 12 | MOSI β SPI data input |
| Pin 13 | MISO β SPI data output |
| Pin 14 | CS β Chip select |
| Pin 15 | RST β Reset |
| Pin 16 | EN β Enable |
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
L9779WD-SPI-TR is suitable for 6 applications: Automotive Body Control Module, LED Lighting Control, Relay Driver for Power Windows, Solenoid Driver for Transmission Control, Industrial Automation Control, Smart Power Distribution.
Automotive Body Control Module
The L9779WD-SPI-TR is used in body control modules to drive relays for power windows, door locks, and lighting. Its 8 configurable outputs and SPI interface allow centralized control and diagnostics, reducing wiring complexity and improving reliability. The wide supply range handles load dump transients, and the fail-safe mode ensures outputs are deactivated on communication loss, enhancing safety. With AEC-Q100 qualification and -40Β°C to +150Β°C operation, it meets automotive thermal and reliability requirements. The integrated protection features eliminate the need for external components, saving PCB space and cost.
Recommended
LED Lighting Control
The L9779WD-SPI-TR drives LED strings in automotive lighting systems, such as daytime running lights and interior lighting. Its high-side outputs can be PWM-controlled for dimming, and the diagnostic features detect open or shorted LEDs, enabling fault reporting to the ECU. The device's low standby current minimizes battery drain when the vehicle is off. The SPI interface allows individual channel control and readback of status registers, simplifying lighting control algorithms. The thermal protection ensures safe operation under high ambient temperatures, and the compact PowerSSO-36 package fits into slim lighting modules.
Recommended
Relay Driver for Power Windows
The L9779WD-SPI-TR drives relays that control power window motors. Its high-side outputs provide the necessary current to energize relays, while the integrated freewheeling protection handles inductive kickback. The SPI interface enables precise control of window up/down commands and diagnostic feedback on relay coil health. The device's over-current protection prevents damage in case of a stalled motor, and the fail-safe mode ensures windows do not operate if the SPI bus fails. The wide operating temperature range supports extreme climates, and the AEC-Q100 qualification guarantees long-term reliability in automotive environments.
Recommended
Solenoid Driver for Transmission Control
The L9779WD-SPI-TR drives solenoids in automatic transmission control units, providing precise current control for hydraulic valve actuation. Its low-side outputs can sink the required current, and the diagnostic features monitor solenoid resistance to detect wear or failure. The SPI interface allows the transmission ECU to adjust PWM duty cycles for smooth gear shifts. The device's thermal protection prevents overheating during prolonged operation, and the wide supply range accommodates battery voltage fluctuations. The fail-safe mode ensures solenoids are de-energized in case of communication loss, preventing unsafe transmission behavior.
Recommended
Industrial Automation Control
The L9779WD-SPI-TR can be used in industrial automation for driving solenoids, relays, and LEDs in PLCs and control panels. Its SPI interface allows easy integration with microcontrollers, and the diagnostic features enable predictive maintenance by detecting load faults. The wide supply voltage range supports 24V industrial systems, and the robust protection features ensure reliable operation in harsh environments. The device's low standby current is beneficial for energy-efficient designs, and the compact package saves PCB space in dense control cabinets.
Recommended
Smart Power Distribution
The L9779WD-SPI-TR enables smart power distribution in vehicles and industrial systems by providing controlled switching and diagnostics for multiple loads. Its SPI interface allows centralized monitoring of load currents and fault status, enabling intelligent power management. The device's configurable outputs can be used for both high-side and low-side switching, making it versatile for various load types. The fail-safe mode enhances system safety by deactivating outputs on communication loss. The AEC-Q100 qualification and wide temperature range make it suitable for demanding applications.
Recommended
Recommended Products Summary
Engineering reference data for L9779WD-SPI-TR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9779WD | L9779WD13TR | MC33996 | TLE6228 |
|---|---|---|---|---|---|
| Package | PowerSSO-36 | PowerSSO-36 | PowerSSO-36 | PowerSSO-36 | PowerSSO-36 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors | Infineon |
| Supply Voltage Range | 4.5V to 40V | 4.5V to 40V | 4.5V to 40V | [DATA_NEEDED] | [DATA_NEEDED] |
| Number of Outputs | 8 | 8 | 8 | [DATA_NEEDED] | [DATA_NEEDED] |
| Output Current per Channel | 0.5A | 0.5A | 0.5A | [DATA_NEEDED] | [DATA_NEEDED] |
| SPI Clock Frequency | 5 MHz | 5 MHz | 5 MHz | [DATA_NEEDED] | [DATA_NEEDED] |
| Operating Temperature Range | -40Β°C to +150Β°C | -40Β°C to +150Β°C | -40Β°C to +150Β°C | [DATA_NEEDED] | [DATA_NEEDED] |
| AEC-Q100 Qualified | Yes | Yes | Yes | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Wide supply voltage range up to 40V (vs NXP MC33996)
- AEC-Q100 qualified for automotive (vs Infineon TLE6228)
- 8 configurable outputs with SPI diagnostics (vs L9779WD (same brand))
Design Notes
Ensure adequate copper area on the PowerSSO-36 exposed pad for heat dissipation. Use multiple vias to connect the pad to the ground plane. Place 100nF decoupling capacitors close to the VCC and GND pins to suppress high-frequency noise.
Route SPI lines (SCK, MOSI, MISO, CS) with controlled impedance and keep them away from high-current output traces to minimize crosstalk. Add series resistors (e.g., 22Ξ©) on SPI lines to reduce ringing and improve signal integrity.
Do not exceed the absolute maximum supply voltage of 40V. Ensure the SPI bus is properly terminated and the chip select is pulled high when not in use to avoid false triggering. Implement a watchdog timer in the MCU to reset the device if communication is lost.
Compliance Information
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page.
