L9780 - Wide Range Air Fuel Sensor Interface PMIC | STMicroelectronics
MPN: L9780 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.18 | $9.18 |
| 10 | $8.5 | $85.00 |
| 100 | $7.8 | $780.00 |
| 500 | $7.2 | $3,600.00 |
| 1,000 | $6.8 | $6,800.00 |
L9780 Overview
A wide range air fuel sensor interface is a specialized analog front-end that controls the oxygen pump current in a lambda sensor to measure the air-fuel ratio across a broad range. It is a critical component in the engine management system, converting the sensor's pump current into a measurable signal for the ECU. The L9780 sits within the power management hierarchy, functioning as a dedicated sensor interface IC that bridges the sensor element and the microcontroller.
Key features of the L9780 include a voltage controlled current source for precise pump control, a PI controller with external compensation for sensor adaptability, and a 48-pin LQFP package suitable for space-constrained automotive modules. The device is designed to operate over the automotive temperature range, ensuring reliable performance in harsh environments.
Technically, the L9780 integrates the analog control loop necessary for wide range air fuel sensors, eliminating the need for discrete components and simplifying the ECU design. Its architecture supports various sensor types, making it a versatile solution for engine management systems. The external compensation network allows designers to tune the control loop for specific sensor characteristics.
Typical applications include engine control units (ECUs) for gasoline and diesel engines, where precise air-fuel ratio measurement is essential for emissions control and fuel efficiency. The L9780 is also used in aftermarket engine management systems and test equipment for air fuel sensor characterization.
When designing with the L9780, ensure the external compensation network is properly tuned for the specific sensor used, as this directly affects control loop stability and measurement accuracy. Additionally, consider the thermal performance of the LQFP package in high-temperature engine bay environments.
Drop-in alternatives for L9780 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with L9780 (same form factor and footprint) — differing in AEC-Q100 Qualified, Function, Input Voltage Range, Operating Temperature Range, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
L9780-TR
✅ Drop-In✓ In Stock
$8.1 / Unit
View Datasheet →L9781
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
L9782
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
L9780 Maximum Ratings & Electrical Characteristics
| Function | Wide range air fuel sensor control interface |
| Package | 48-LQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Control Interface | Voltage controlled current source (VCCS) |
| Controller Type | PI controller with external compensation |
| Number of Pins | 48 |
| Package Size | 7x7 mm |
| RoHS Status | Compliant |
| REACH Status | Compliant |
| AEC-Q100 Qualified | Yes (automotive grade) |
| Lead-Free | Yes |
L9780 Pin Configuration
| Pin 1 | VCC — Power supply |
| Pin 2 | GND — Ground |
| Pin 3 | OUT — Output to oxygen pump |
| Pin 4 | SENSE — Sensor feedback |
| Pin 5 | COMP — External compensation network |
| Pin 6 | REF — Reference voltage |
| Pin 7 | EN — Enable |
| Pin 8 | NC — No connect |
Typical Applications
L9780 is suitable for 6 applications: Engine Control Unit (ECU), Aftermarket Engine Management Systems, Emissions Testing Equipment, Automotive Diagnostic Tools, Fuel Cell Control Systems, Research and Development.
Engine Control Unit (ECU)
The L9780 is used in ECUs to interface with wide range air fuel sensors, providing precise control of the oxygen pump current for accurate air-fuel ratio measurement. This enables optimal engine performance, fuel efficiency, and emissions control. The device's VCCS and PI controller ensure stable operation across various sensor types and operating conditions. In a typical ECU, the L9780 is placed between the sensor element and the microcontroller, converting the pump current into a digital signal for processing. The external compensation network allows tuning for specific sensor characteristics, ensuring reliable operation in demanding automotive environments.
Recommended
Aftermarket Engine Management Systems
The L9780 is used in aftermarket engine management systems for performance tuning and emissions testing. Its wide range air fuel sensor interface allows precise air-fuel ratio control, which is essential for optimizing engine performance and fuel economy. The device's compact LQFP package and automotive-grade qualification make it suitable for retrofit applications. In an aftermarket system, the L9780 interfaces with the sensor and provides a signal to the tuning computer, enabling real-time adjustments. The external compensation network allows customization for different sensor brands and models.
Recommended
Emissions Testing Equipment
The L9780 is used in emissions testing equipment to measure air-fuel ratio accurately. Its high precision and stability ensure reliable measurements, which are critical for regulatory compliance. The device's VCCS and PI controller provide precise control of the oxygen pump current, enabling accurate readings across a wide range of air-fuel ratios. In an emissions tester, the L9780 is integrated into the sensor interface module, providing a clean signal to the measurement system. The external compensation network allows calibration for different sensor types.
Recommended
Automotive Diagnostic Tools
The L9780 is used in automotive diagnostic tools to test and calibrate air fuel sensors. Its ability to interface with a variety of sensors makes it a versatile component for diagnostic equipment. The device's compact package and automotive-grade qualification ensure reliable operation in workshop environments. In a diagnostic tool, the L9780 is used to simulate sensor conditions and verify sensor performance. The external compensation network allows adaptation to different sensor models.
Recommended
Fuel Cell Control Systems
The L9780 can be used in fuel cell control systems to monitor and control the air-fuel mixture. Its precise current control and wide range capability make it suitable for fuel cell applications. The device's VCCS and PI controller provide stable operation, ensuring optimal fuel cell performance. In a fuel cell system, the L9780 interfaces with the air fuel sensor and provides feedback to the control unit. The external compensation network allows tuning for specific fuel cell configurations.
Recommended
Research and Development
The L9780 is used in R&D environments for developing and testing new air fuel sensor technologies. Its flexibility and precision make it an ideal platform for sensor characterization and control algorithm development. The device's external compensation network allows researchers to experiment with different control parameters. In an R&D lab, the L9780 is used to interface with prototype sensors and evaluate their performance. The compact package and automotive-grade qualification ensure reliable operation in test setups.
Recommended
Recommended Products Summary
Engineering reference data for L9780 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9780-TR | L9781 | L9782 |
|---|---|---|---|---|
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Function | Wide range air fuel sensor control interface | Wide range air fuel sensor control interface | Wide range air fuel sensor control interface | Wide range air fuel sensor control interface |
Key Differentiators
- Automotive-grade qualification (vs Generic sensor interface ICs)
- Integrated VCCS and PI controller (vs Discrete implementations)
- Wide range air fuel sensor support (vs Narrow range sensor interfaces)
Design Notes
Ensure proper decoupling on the VCC pin with a 100nF ceramic capacitor placed as close as possible to the pin. Use a 10uF bulk capacitor for low-frequency filtering. The LQFP package has exposed pads that should be soldered to a thermal pad on the PCB for improved heat dissipation.
The external compensation network must be tuned according to the specific air fuel sensor used. Incorrect compensation can lead to control loop instability and inaccurate readings. Refer to the datasheet for recommended component values and tuning procedures.
In high-temperature engine bay environments, ensure adequate thermal management. The LQFP package has a thermal resistance that may require a heatsink or forced airflow for reliable operation. Calculate power dissipation based on the pump current and supply voltage to determine if additional cooling is needed.
Compliance Information
RoHS and REACH compliance indicated in distributor listings. AEC-Q100 qualified for automotive applications. Halogen-free and conflict minerals status not specified in verified data.
