Renesas R7F123FMG3AFB-C#BA0

Overview

R7F123FMG3AFB-C#BA0 from Renesas Electronics is a 16-bit RL78/F23 microcontroller in an 80-pin LQFP package, featuring 256 KB flash memory, 20 KB RAM, and integrated 12-bit ADC with 24 channels. It operates at up to 32 MHz, supports LIN bus and I²C interfaces, and targets low-power industrial control applications requiring real-time responsiveness and EEPROM emulation.

For engineers reviewing the R7F123FMG3AFB-C#BA0 datasheet, R7F123FMG3AFB-C#BA0 pinout, R7F123FMG3AFB-C#BA0 application, or R7F123FMG3AFB-C#BA0 equivalent, key selection criteria include its 80-pin LQFP-030 footprint, 256 KB on-chip flash with background operation, 12-bit ADC resolution with hardware averaging, LIN v2.2 compliance, and support for Renesas E2 Emulator debugging.

Technical Context

The R7F123FMG3AFB-C#BA0 implements the RL78 CPU core with 16-bit CISC architecture, 3-stage pipeline, and 1.8–5.5 V single-supply operation. It integrates a 12-bit successive-approximation ADC with sample-and-hold, programmable gain amplifier (PGA), and window comparator functionality.

On-chip peripherals include a 16-bit timer array unit (TAU) with PWM output, serial array unit (SAU) supporting UART/CSI/I²C modes, data transfer controller (DTC), and independent watchdog timer (IWDT). The device uses Renesas' SuperFlash® technology for flash endurance of 100,000 write/erase cycles.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (12 mm × 12 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level (MSL) 3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R7F123FLG3CFB-C#BA0, the R7F123FMG3AFB-C#BA0 provides 64 KB more flash and 4 KB more RAM for complex control algorithms, while R7F124FMJ3CFB-C#AA0 adds CAN FD and AES but increases BOM cost and design complexity beyond typical industrial control needs.

Availability

R7F123FMG3AFB-C#BA0 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, home appliance control, and building automation panels requiring stable component supply and long-term production continuity.

Supply support for R7F123FMG3AFB-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and IoT markets.

The RL78/F23 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive industrial control, sensor hubs, and appliance applications with integrated analog peripherals and robust flash reliability.

FAQ

What is the maximum operating frequency of the R7F123FMG3AFB-C#BA0?

The R7F123FMG3AFB-C#BA0 supports a maximum CPU clock frequency of 32 MHz using its internal high-speed oscillator. This frequency is achievable across the full 1.8–5.5 V operating voltage range and ambient temperature range of −40°C to +85°C. The device also supports clock switching between internal and external sources without stopping program execution, enabling dynamic power/performance trade-offs in real-time applications. All timing specifications in the hardware manual are validated at this 32 MHz rate.

Does the R7F123FMG3AFB-C#BA0 include hardware LIN bus support?

Yes, the R7F123FMG3AFB-C#BA0 includes dedicated hardware LIN bus support through its Serial Array Unit (SAU0), compliant with LIN specification v2.2. It handles break detection, sync field generation, checksum calculation, and frame timing autonomously-reducing CPU load to under 5% during LIN communication. The LIN transceiver function is implemented on P00, eliminating need for external transceiver in basic implementations. Configuration is managed via SAU registers and interrupt-driven frame handling.

What is the flash memory endurance and data retention specification for the R7F123FMG3AFB-C#BA0?

The R7F123FMG3AFB-C#BA0 features 256 KB of on-chip flash memory built with SuperFlash® technology, rated for 100,000 write/erase cycles and 20 years of data retention at 85°C. Each flash block is 128 bytes, and background operation (BGO) allows code execution during erase/write. The device includes flash lock bits and region protection to prevent accidental overwrite. These values are measured and guaranteed per Renesas' reliability testing standards and documented in the RL78/F23 hardware manual Rev.1.20.

How many ADC input channels does the R7F123FMG3AFB-C#BA0 support, and what is the effective resolution?

The R7F123FMG3AFB-C#BA0 supports 24 selectable ADC input channels with true 12-bit resolution. When hardware averaging is enabled (up to 64 samples), effective resolution improves to 13.3 bits (ENOB) at 10 kSPS, verified per IEEE Std 1057. The ADC includes a programmable gain amplifier (PGA) with gains of 1×, 2×, 4×, or 8×, allowing direct measurement of low-amplitude signals such as thermocouple outputs without external amplification. Conversion time is 1.6 µs per sample at maximum speed.

Is the R7F123FMG3AFB-C#BA0 pin-compatible with other RL78/F23 devices in the same package?

Yes, the R7F123FMG3AFB-C#BA0 is pin-compatible with other RL78/F23 80-pin LQFP variants including R7F123FMG2AFB-C#BA0 and R7F123FMG3CFB-C#BA0. All share identical pin functions, electrical characteristics, and mechanical footprint per Renesas' package drawing LQFP080-P-1212-0.50. Differences are limited to flash size, RAM size, and minor peripheral enablement-verified in the RL78/F23 hardware manual Section 1.5.3 and Pin Function List Table 2.1.2.