Renesas R7F124FLJ4AFB-C#AA0

Overview

R7F124FLJ4AFB-C#AA0 from Renesas Electronics is a 16-bit RL78/F24 microcontroller in a 64-pin LQFP package, featuring 256 KB flash memory, 20 KB RAM, and integrated 12-bit ADC, 16-bit timer arrays, and LIN/UART/SPI/I²C interfaces. It operates at up to 32 MHz, supports 1.6–5.5 V supply, and targets low-power industrial control and automotive body electronics.

For engineers reviewing the R7F124FLJ4AFB-C#AA0 datasheet, R7F124FLJ4AFB-C#AA0 pinout, R7F124FLJ4AFB-C#AA0 application, or R7F124FLJ4AFB-C#AA0 equivalent, key selection criteria include its 64-pin LQFP-0.5mm pitch package, 256 KB on-chip flash with ECC, 12-bit ADC with 24 channels, LIN v2.2 compliance, and support for Renesas E2 Emulator debugging.

Technical Context

The R7F124FLJ4AFB-C#AA0 implements the RL78 CPU core with 3-stage pipeline, 16-bit CISC architecture, and built-in multiplier/divider. It integrates a 12-bit successive-approximation ADC with sample-and-hold, programmable gain amplifier (PGA), and window comparator functionality.

Peripheral integration includes three 16-bit timer arrays (TAU) with PWM output, a real-time clock (RTC) with calendar function, 32-bit watchdog timer (WDT), and dual CAN FD controllers compliant with ISO 11898-1:2015 - though CAN FD is confirmed only for R7F124Fxx variants with "G" or "M" suffixes; the FLJ package variant does not include CAN FD per RL78/F24 Hardware Manual Rev.1.20 Section 1.3.1.

Key Specifications

Pinout & Package

64-pin LQFP (PLQP0064KB-A) with exposed thermal pad; 0.5 mm pitch, 10 mm × 10 mm body size, JEDEC standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R7F124FMJ4AFB-C#AA0 and R7F124FGJ4AFB-C#AA0, the R7F124FLJ4AFB-C#AA0 delivers optimal balance of I/O density (52 usable GPIO), analog capability (24 ADC channels), and memory (256 KB flash/20 KB RAM) in the smallest 64-pin LQFP footprint - making it ideal for mid-tier industrial HMI and automotive junction box modules where layout area and feature completeness are both critical.

Availability

R7F124FLJ4AFB-C#AA0 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, smart energy metering, and medical device subsystems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for R7F124FLJ4AFB-C#AA0 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 Japan-based semiconductor manufacturer specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/F24 product line targets cost-sensitive, ultra-low-power embedded applications demanding high integration, functional safety readiness, and seamless toolchain compatibility with Renesas' e² studio IDE and CS+ development environment.

FAQ

What is the maximum operating frequency of the R7F124FLJ4AFB-C#AA0?

The R7F124FLJ4AFB-C#AA0 operates at a maximum CPU frequency of 32 MHz, achieved using the on-chip high-speed oscillator (HOCO) or an external crystal/resonator up to 20 MHz with PLL multiplication. This frequency is fully supported across the full −40 °C to +85 °C temperature range and 1.6–5.5 V supply voltage, enabling deterministic real-time performance in motor control and communication protocols.

Does the R7F124FLJ4AFB-C#AA0 include CAN FD support?

No, the R7F124FLJ4AFB-C#AA0 does not include CAN FD controllers. While the RL78/F24 family documentation lists CAN FD capability for certain 80-pin and 100-pin variants (e.g., R7F124Fxx with "M" or "G" suffix), the 64-pin FLJ package variants - including R7F124FLJ4AFB-C#AA0 - are explicitly excluded from CAN FD support per Section 1.3.1 of the RL78/F24 Hardware Manual Rev.1.20.

What debug interface does the R7F124FLJ4AFB-C#AA0 support?

The R7F124FLJ4AFB-C#AA0 supports Renesas' single-wire debug (SWD) interface via the dedicated RES# pin, fully compatible with the E2 Emulator and E2 Lite Emulator. No external debug header is required - debug signals share the RESET pin, minimizing PCB footprint while maintaining full breakpoint, watchpoint, and real-time trace capabilities during development and field firmware updates.

Is the R7F124FLJ4AFB-C#AA0 qualified for automotive applications?

Yes, the R7F124FLJ4AFB-C#AA0 is AEC-Q100 Grade 2 qualified (−40 °C to +105 °C ambient), with built-in features supporting automotive body electronics: LIN v2.2 compliance, fail-safe reset architecture, flash ECC, and robust ESD immunity (±6 kV HBM). It is designated for "Standard" quality grade per Renesas documentation, appropriate for non-safety-critical automotive systems such as door modules and climate controls.

What is the purpose of the REGC pin on the R7F124FLJ4AFB-C#AA0?

REGC is the regulator capacitor pin for the on-chip DC-DC step-down regulator that powers the CPU core. A 1.0 μF ceramic capacitor must be connected between REGC and VSS to stabilize the internal 1.25 V core supply. This pin is mandatory for operation - omitting the capacitor causes unstable core voltage, leading to unpredictable resets or instruction corruption, especially during dynamic clock scaling or low-voltage conditions.