Renesas R7F124FBJ3ANP-C#BA0

Overview

R7F124FBJ3ANP-C#BA0 from Renesas is a 16-bit automotive-grade MCU in the RL78/F24 family, featuring 40 MHz operation, 256 KB on-chip flash, CAN FD interface, EVITA-Light security (AES-128/192/256), and ASIL-B functional safety compliance for sensor/actuator ECUs operating up to 150°C.

For engineers reviewing the R7F124FBJ3ANP-C#BA0 datasheet, R7F124FBJ3ANP-C#BA0 pinout, R7F124FBJ3ANP-C#BA0 application, or R7F124FBJ3ANP-C#BA0 equivalent, key selection criteria include CAN FD support, 12-bit ADC (31 channels), FOC assist hardware accelerator, 92 GPIOs, and -40°C to +150°C ambient operation.

Technical Context

The R7F124FBJ3ANP-C#BA0 implements the RL78 16-bit CPU core with PLL-based 80 MHz internal clock generation and operates at up to 40 MHz in real-time execution. It integrates an Application Accelerator Unit (AAU) supporting Field-Oriented Control primitives including SIN/COS, Park/Clark transforms, and PI control loops for BLDC motor drive.

It delivers ASIL-B compliance per ISO 26262 via hardware safety mechanisms including clock monitor, voltage monitor, POR/LVD, and ECC-protected memory. Security is implemented through EVITA-Light with dedicated AES engines and secure boot ROM.

Key Specifications

Pinout & Package

Package: 32-pin QFN (5 mm × 5 mm, 0.5 mm pitch), thermally enhanced, 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 R7F124FBJ3ANP-C#BA0, the R7F124FBJ4ANP-C#BA0 offers identical functionality at reduced thermal margin and cost, while the R7F123FMG5AFB trades CAN FD, ASIL-B, and memory capacity for lower system complexity and price in LIN-only use cases.

Availability

R7F124FBJ3ANP-C#BA0 is available at Aetrix Electronics and suitable for automotive sensor ECUs, smart actuator control units, and low-end body control modules requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 qualification.

Supply support for R7F124FBJ3ANP-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 was designed specifically for next-generation automotive edge nodes demanding CAN FD connectivity, hardware-accelerated motor control, and ISO 26262 ASIL-B compliance in harsh thermal environments.

FAQ

What is the maximum ambient operating temperature supported by the R7F124FBJ3ANP-C#BA0?

The R7F124FBJ3ANP-C#BA0 is qualified for continuous operation from −40°C to +150°C ambient temperature, making it suitable for under-hood automotive applications such as engine-mounted actuators and transmission control units where thermal stress is extreme. This rating is verified per AEC-Q100 Grade 0 and applies across all specified voltage and frequency conditions. The R7F124FBJ3ANP-C#BA0 integrates thermal shutdown and voltage monitoring to maintain reliability at this upper limit.

Does the R7F124FBJ3ANP-C#BA0 support CAN FD, and what is its maximum data rate?

Yes, the R7F124FBJ3ANP-C#BA0 includes one fully integrated CAN FD controller supporting bit rate switching, with arbitration phase up to 1 Mbps and data phase up to 5 Mbps. It complies with ISO 11898-1:2015 and supports flexible data-length frames (up to 64 bytes). The R7F124FBJ3ANP-C#BA0 requires an external CAN FD transceiver but provides all protocol handling, error confinement, and timestamping in hardware.

What motor control acceleration features are built into the R7F124FBJ3ANP-C#BA0?

The R7F124FBJ3ANP-C#BA0 integrates an Application Accelerator Unit (AAU) that implements hardware-accelerated Field-Oriented Control functions including SIN/COS generation, Park and Clark coordinate transforms, and PI control loops. These operations execute in parallel with the RL78 core, reducing CPU load by over 60% during real-time BLDC commutation. The R7F124FBJ3ANP-C#BA0 also includes a 32-bit multiplier and Timer Array Unit optimized for high-frequency PWM generation.

How does the R7F124FBJ3ANP-C#BA0 meet ISO 26262 ASIL-B requirements?

The R7F124FBJ3ANP-C#BA0 achieves ASIL-B readiness through integrated hardware safety mechanisms: clock failure detection, voltage monitor with LVD/POR, ECC on code/data flash and RAM, memory BIST, and lockstep-capable peripherals. Its safety manual documents diagnostic coverage metrics and safe failure fraction (SFF) per ISO 26262-5. The R7F124FBJ3ANP-C#BA0 is supported by Renesas' FMEDA reports and safety analysis deliverables for system-level integration.

Is the R7F124FBJ3ANP-C#BA0 pin-compatible with earlier RL78 MCUs?

Yes, the R7F124FBJ3ANP-C#BA0 is pin-compatible with the RL78/F14 and RL78/F13 families in the same 32-pin QFN package, enabling drop-in replacement for design upgrades. This includes identical pin mapping for power, reset, oscillator, debug, and primary peripheral interfaces (LIN, UART, I²C). However, new features like CAN FD and AAU require updated firmware and may need minor PCB layout review for signal integrity at higher speeds.