Renesas R7F124FMJ3AFB-C#BA0

Overview

R7F124FMJ3AFB-C#BA0 from Renesas is a 16-bit automotive-grade MCU in the RL78/F24 family, operating at 40 MHz with 256 KB code flash, 24 KB RAM, and ASIL-B functional safety compliance per ISO 26262. It integrates CAN FD, 12-bit ADC (31 channels), FOC-assist hardware accelerator, and supports operation up to 150°C - deployed in smart actuator ECUs for brushless motor control.

For engineers reviewing the R7F124FMJ3AFB-C#BA0 datasheet, R7F124FMJ3AFB-C#BA0 pinout, R7F124FMJ3AFB-C#BA0 application, or R7F124FMJ3AFB-C#BA0 equivalent, key selection criteria include CAN FD interface support, on-chip EVITA-Light security, 12-bit ADC resolution with dedicated sample-and-hold, ASIL-B certification evidence, and thermal rating for under-hood deployment.

Technical Context

The R7F124FMJ3AFB-C#BA0 implements the RL78 CPU core with PLL-based 80 MHz internal clock generation and real-time debug capability (hot-plug, live debug). It features an Application Accelerator Unit (AAU) supporting SIN/COS, Park/Clark transforms, and PI control for sensorless BLDC vector control.

Functional safety is addressed via integrated voltage monitors (POR, LVD), clock monitor, ELC event linking, and hardware-based EVITA-Light security including AES-128/192/256 encryption. The device supports dual-channel LIN/UART, up to 4 I²C channels, and 16-channel Timer Array Unit for precise timing-critical motor phase control.

Key Specifications

Pinout & Package

Package: 80-pin QFP (14 mm × 14 mm, 0.65 mm pitch), RoHS-compliant, rated for -40°C to +150°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit automotive MCU applications.

Compared with R7F124FPJ3AFB-C#BA0, the R7F124FMJ3AFB-C#BA0 offers identical core performance and security but reduces pin count and I/O for compact body modules; versus R7F123FMG3AFB-C#BA0, it adds critical CAN FD, AAU, and EVITA-Light - enabling next-gen connected and safety-certified designs.

Availability

R7F124FMJ3AFB-C#BA0 is available at Aetrix Electronics and suitable for automotive body control modules, smart actuator ECUs, and sensor fusion nodes requiring stable component supply, long-term lifecycle assurance, and ASIL-B traceability.

Supply support for R7F124FMJ3AFB-C#BA0 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/F24 product line delivers automotive-qualified 16-bit MCUs optimized for ASIL-B functional safety, EVITA-Light security, and high-efficiency motor control - targeting next-generation E/E architectures with distributed intelligence.

FAQ

What is the maximum operating temperature specification for R7F124FMJ3AFB-C#BA0?

The R7F124FMJ3AFB-C#BA0 is rated for continuous operation from -40°C to +150°C ambient temperature. This specification is validated per AEC-Q100 Grade 0 stress testing and supports placement in high-heat zones such as engine compartments or near power stages in motor drives. The device maintains full functionality-including CAN FD communication, 12-bit ADC accuracy, and FOC accelerator timing-across this full range.

Does R7F124FMJ3AFB-C#BA0 support CAN FD, and what data rate does it achieve?

Yes, the R7F124FMJ3AFB-C#BA0 integrates a hardware CAN FD controller supporting data rates up to 5 Mbps in the data phase and standard 1 Mbps in arbitration phase. It complies with ISO 11898-1:2015 and supports flexible data field lengths up to 64 bytes. This capability is confirmed in the RL78/F24 hardware manual (R01UH0894EJ0100) and enables faster firmware updates and richer diagnostic messaging in automotive body networks.

Is R7F124FMJ3AFB-C#BA0 pin-compatible with earlier RL78/F1x MCUs?

Yes, the R7F124FMJ3AFB-C#BA0 is explicitly documented as pin-compatible with RL78/F14 and RL78/F13 MCUs in the same 80-pin QFP package. This allows drop-in replacement on existing PCBs, preserving layout, passive components, and power delivery design while upgrading to CAN FD, FOC acceleration, and ASIL-B safety features without redesign.

What security features does R7F124FMJ3AFB-C#BA0 provide under EVITA-Light?

The R7F124FMJ3AFB-C#BA0 implements EVITA-Light security with hardware-accelerated AES-128/192/256 encryption, secure key storage, and protected boot ROM. It supports secure firmware updates, encrypted parameter storage, and cryptographic authentication for OTA operations - all verified against ISO/SAE 21434 cybersecurity engineering requirements for automotive ECUs.

How does the Application Accelerator Unit (AAU) in R7F124FMJ3AFB-C#BA0 improve BLDC motor control?

The AAU in R7F124FMJ3AFB-C#BA0 executes Park/Clark transforms, SIN/COS generation, and PI control loops in dedicated hardware - offloading ~75% of computational load from the RL78 CPU core. This enables deterministic 20 kHz motor control loops with sub-microsecond timing jitter, essential for low-noise, high-efficiency BLDC operation in automotive actuators.