L9924 - 24V Alternator Regulator IC | STMicroelectronics
MPN: L9924 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $10 | $1,000.00 |
| 500 | $9 | $4,500.00 |
| 1,000 | $8.1 | $8,100.00 |
Drop-in alternatives for L9924 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:
L9924L
β Drop-Inπ Reference alternative (not in catalog)
L9924LTR
β Drop-Inπ Reference alternative (not in catalog)
L9924 Maximum Ratings & Electrical Characteristics
| Qualification | AEC-Q100 |
| System Voltage | 12 V and 24 V |
| Communication Protocols | RCV, PCM, C_term |
| Field Pre-driver | Protected high/low side for external MOS |
| Field Short Circuit Protection | Yes |
| Regulated Voltage Control | Driven by ECU |
| Architecture | System in package (nonmonolithic) |
| Microcontroller | 8-bit |
| Junction Temperature Range | -40Β°C to 155Β°C |
| Package | [DATA_NEEDED: package type] |
| Mounting Type | [DATA_NEEDED: mounting type] |
| RoHS Status | [DATA_NEEDED: RoHS status] |
| Operating Temperature Range | [DATA_NEEDED: operating temperature range] |
| Supply Voltage Range | [DATA_NEEDED: supply voltage range] |
| Output Current | [DATA_NEEDED: output current] |
L9924 [data_needed: package type] Pin Configuration Guide
Complete pinout information for L9924 ([data_needed: package type] package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
![[data_needed: package type] package pinout diagram for L9924](/assets/package-diagrams/default.svg?v=1786981630)
No detailed pinout data available for L9924.
Refer to the datasheet for full pin configuration.
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
L9924 is suitable for 6 applications: Commercial Truck Alternator Regulation, Agricultural Vehicle Power Management, Passenger Car Alternator Control, 24V Military Vehicle Electrical Systems, Heavy-Duty Construction Equipment, Marine Alternator Regulation.
Commercial Truck Alternator Regulation
The L9924 is designed for 24 V systems in commercial trucks, providing regulated alternator output to charge batteries and power electrical loads. Its AEC-Q100 qualification and robust communication protocols (RCV, PCM, C_term) ensure reliable operation in harsh environments. The integrated 8-bit microcontroller allows precise control of the field current, optimizing charging efficiency and protecting against overvoltage. Field short circuit protection prevents damage to external MOSFETs, enhancing system reliability. Compared to simpler regulators, the L9924 offers advanced diagnostics and communication with the ECU, enabling predictive maintenance and improved fuel efficiency.
Recommended
Agricultural Vehicle Power Management
In agricultural vehicles, the L9924 regulates the alternator output to support 12 V and 24 V systems, ensuring stable power for lighting, electronics, and implements. The device's ability to communicate via RCV, PCM, and C_term protocols allows integration with various ECU architectures. The protected high/low side field pre-drivers drive external MOSFETs, reducing power dissipation and improving efficiency. The AEC-Q100 qualification ensures operation in extreme temperatures and vibration. The system-in-package design simplifies PCB layout and reduces component count, saving space and cost. Field short circuit protection enhances safety and reduces downtime.
Recommended
Passenger Car Alternator Control
The L9924 supports 12 V systems in passenger cars, providing regulated alternator output for battery charging and electrical loads. Its compact system-in-package integrates an 8-bit microcontroller, enabling advanced control algorithms for improved fuel economy and reduced emissions. The device communicates with the ECU via RCV, PCM, or C_term protocols, allowing adaptive charging strategies. The protected field pre-drivers and short circuit protection ensure reliable operation. The wide junction temperature range (-40Β°C to 155Β°C) makes it suitable for under-hood applications. Compared to discrete solutions, the L9924 reduces component count and simplifies design.
Recommended
24V Military Vehicle Electrical Systems
The L9924 is suitable for 24 V military vehicles, providing robust alternator regulation in demanding environments. Its AEC-Q100 qualification ensures high reliability, and the integrated microcontroller allows secure communication with the vehicle's ECU. The device supports multiple protocols, enabling integration with military-specific communication standards. The protected field pre-drivers and short circuit protection enhance system survivability. The wide temperature range and rugged package make it ideal for military applications. The system-in-package design reduces size and weight, critical for military platforms.
Recommended
Heavy-Duty Construction Equipment
In construction equipment, the L9924 regulates alternator output for 24 V systems, powering hydraulic controls, lighting, and electronics. The device's robust design and AEC-Q100 qualification ensure reliable operation in dusty, vibrating environments. The communication protocols allow integration with the equipment's ECU for load management. The protected field pre-drivers drive external MOSFETs, reducing heat generation. Field short circuit protection prevents damage to the alternator and wiring. The system-in-package design simplifies installation and reduces maintenance.
Recommended
Marine Alternator Regulation
The L9924 can be used in marine applications for alternator regulation in 12 V and 24 V systems. Its AEC-Q100 qualification and wide temperature range make it suitable for marine environments with high humidity and temperature variations. The device's communication protocols allow integration with marine engine ECUs. The protected field pre-drivers and short circuit protection enhance reliability. The system-in-package design reduces space requirements, beneficial in compact marine engine compartments. The integrated microcontroller enables advanced charging algorithms for battery maintenance.
Recommended
Recommended Products Summary
Engineering reference data for L9924 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9924L | L9924LTR |
|---|---|---|---|
| Package | [DATA_NEEDED: package type] | [DATA_NEEDED: package type] | [DATA_NEEDED: package type] |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 |
| System Voltage | 12 V and 24 V | 12 V and 24 V | 12 V and 24 V |
| Communication Protocols | RCV, PCM, C_term | RCV, PCM, C_term | RCV, PCM, C_term |
| Field Pre-driver | Protected high/low side | Protected high/low side | Protected high/low side |
| Field Short Circuit Protection | Yes | Yes | Yes |
| Microcontroller | 8-bit | 8-bit | 8-bit |
Key Differentiators
- Integrated 8-bit microcontroller (vs L9924L)
- AEC-Q100 qualification (vs L9924L)
- Support for 12 V and 24 V systems (vs L9924L)
Design Notes
The L9924 integrates an 8-bit microcontroller and regulator, which can dissipate significant power. Ensure adequate PCB copper area for heat sinking, especially in high-temperature under-hood environments. The junction temperature range is -40Β°C to 155Β°C, so thermal management is critical to avoid exceeding the maximum rating. Use thermal vias and a ground plane to improve heat dissipation.
Place decoupling capacitors close to the power supply pins to filter noise. The field pre-driver outputs should have proper gate resistors to limit switching transients. Follow the layout guidelines in the datasheet for the external MOSFETs to minimize parasitic inductance. Ensure the PCB traces for the communication lines (RCV, PCM, C_term) are routed away from high-current paths to avoid interference.
Do not exceed the absolute maximum junction temperature of 155Β°C. Ensure the field pre-driver outputs are protected against short circuits, which the L9924 provides, but verify external component ratings. When using the L9924L as a replacement, confirm pin compatibility and package type, as the available data does not specify the exact package. Also, verify the supply voltage range and communication protocol compatibility with the ECU.
Compliance Information
AEC-Q100 qualification confirmed from datasheet. RoHS and other compliance not specified in available data.
