Renesas R7F123FGG4AFB-C#BA0

Overview

R7F123FGG4AFB-C#BA0 from Renesas Electronics is a 16-bit RL78/F23 microcontroller in 48-pin LQFP package, featuring 64 KB flash, 4 KB RAM, and integrated 12-bit ADC, 10-bit DAC, and hardware multiplier. It operates at up to 32 MHz, supports 1.8–5.5 V supply, and targets low-power industrial control and sensor interface applications.

For engineers reviewing the R7F123FGG4AFB-C#BA0 datasheet, R7F123FGG4AFB-C#BA0 pinout, R7F123FGG4AFB-C#BA0 application, or R7F123FGG4AFB-C#BA0 equivalent, key selection criteria include its 48-pin LQFP footprint, dual voltage domains (EVDD/EVSS), on-chip debug support via FINE v3, and compliance with RL78/F23 peripheral register mapping per Hardware User's Manual Rev.1.20.

Technical Context

The R7F123FGG4AFB-C#BA0 implements the RL78 CPU core with 3-stage pipeline, supporting 16-bit ALU operations and 8/16/24-bit addressing modes. It integrates a 12-bit successive-approximation ADC with 12 input channels, 10-bit DAC with 2 channels, and 16-bit timer arrays (TMR00–TMR03) with complementary PWM output capability.

Its power management includes HALT, STOP, and SNOOZE modes with wake-up via interrupt or comparator; the on-chip voltage regulator supplies internal logic from 1.8–5.5 V input, while separate EVDD/EVSS pins isolate analog circuitry for ADC/DAC accuracy.

Key Specifications

Pinout & Package

Package: 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R7F123FLG4CFB-C#AA0 and R7F124FGJ4AFB-C#AA0, the R7F123FGG4AFB-C#BA0 delivers optimal balance of size, power, and peripheral set for compact industrial controllers-retaining full RL78/F23 register compatibility while minimizing PCB area and BOM cost where CAN or extra memory are unnecessary.

Availability

R7F123FGG4AFB-C#BA0 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart actuator control, and building automation controllers requiring stable component supply and long-term lifecycle assurance.

Supply support for R7F123FGG4AFB-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, and power devices for industrial, automotive, and IoT markets.

The RL78/F23 product line is designed for ultra-low-power embedded control in space-constrained applications, emphasizing energy efficiency, integrated analog peripherals, and robust debug capabilities without external hardware.

FAQ

What is the maximum operating frequency of the R7F123FGG4AFB-C#BA0?

The R7F123FGG4AFB-C#BA0 supports a maximum CPU operating frequency of 32 MHz. This is achieved using the high-speed on-chip oscillator (HOCO) or an external crystal/resonator up to 20 MHz with PLL multiplication. The device maintains full specification compliance-including ADC timing and flash access-across the entire 1.8–5.5 V supply range at this frequency.

Does the R7F123FGG4AFB-C#BA0 support in-circuit debugging without external hardware?

Yes, the R7F123FGG4AFB-C#BA0 includes an integrated FINE v3 debug interface accessible via dedicated SWD pins (RES# and TMS). It supports real-time trace, four hardware breakpoints, and flash programming without requiring an external debug probe header-enabling direct connection to Renesas E2 or E2 Lite emulators for full development and field firmware updates.

What are the analog power domain requirements for the R7F123FGG4AFB-C#BA0?

The R7F123FGG4AFB-C#BA0 requires separate analog power connections: EVDD0 and EVSS0 must be supplied from clean, low-noise sources isolated from digital VDD/VSS. These pins power the 12-bit ADC, 10-bit DAC, and bandgap reference. A minimum 1.0 μF ceramic capacitor must be placed between REGC and VSS to stabilize the internal LDO that generates EVDD from VDD.

How does the R7F123FGG4AFB-C#BA0 handle low-power operation in battery-powered systems?

The R7F123FGG4AFB-C#BA0 provides three ultra-low-power modes: Halt (0.25 μA), STOP (0.35 μA), and SNOOZE (1.2 μA). In STOP mode, the 12-bit ADC, 10-bit DAC, and 16-bit timers remain operational using the sub-clock (32.768 kHz) or IWDT clock, enabling periodic sensor sampling without waking the CPU-critical for extending battery life in remote monitoring applications.

Is the R7F123FGG4AFB-C#BA0 pin-compatible with other RL78/F23 48-pin variants?

Yes, the R7F123FGG4AFB-C#BA0 shares identical pinout and electrical characteristics with all RL78/F23 48-pin LQFP variants (e.g., R7F123FGG4CFB-C#AA0), including identical function mapping for P00–P07, P10–P17, EVDD0/EVSS0, REGC, and RESET. Firmware and PCB layout are fully interchangeable across these variants, differing only in flash/RAM configuration and security settings.