Renesas R7F124FBJ4ANP-C#BA0

Overview

R7F124FBJ4ANP-C#BA0 from Renesas Electronics is a 16-bit RL78/F24 microcontroller in a 32-pin LQFP package, featuring 128 KB flash memory, 10 KB RAM, and integrated 12-bit ADC with 12 channels. It operates at up to 32 MHz, supports on-chip debug, and targets low-power industrial control and sensor interface applications.

For engineers reviewing the R7F124FBJ4ANP-C#BA0 datasheet, R7F124FBJ4ANP-C#BA0 pinout, R7F124FBJ4ANP-C#BA0 application, or R7F124FBJ4ANP-C#BA0 equivalent, key selection criteria include its 32-pin LQFP footprint, 128 KB flash with ECC, 12-bit ADC resolution with sample-and-hold, and support for LIN bus via on-chip UART with automatic sync detection.

Technical Context

The R7F124FBJ4ANP-C#BA0 implements the RL78 CPU core with 16-bit CISC architecture, supporting 159 instructions and 3-stage pipeline execution. It integrates a 16-bit multifunction timer (MTU), watchdog timer (WDT), real-time clock (RTC), and power-on reset (POR) circuit with voltage detector (LVD).

Peripherals include a 12-bit ADC with 12 input channels and 1.0 μs conversion time, two UARTs (one with LIN support), one I²C-compatible interface, and 27 general-purpose I/O pins with programmable pull-up/pull-down and interrupt capability on all ports.

Key Specifications

Pinout & Package

Package: 32-pin LQFP (7 mm × 7 mm, 0.8 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 R7F124FBJ4ANP-C#BA0, the QFN variant reduces board area by 36% but requires thermal management attention, while the #AA0 version maintains pin compatibility but adds 20 °C thermal margin at higher cost and longer lead time.

Availability

R7F124FBJ4ANP-C#BA0 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC controllers, motor drive interface modules, and energy meter communication hubs requiring stable component supply across multi-year production cycles.

Supply support for R7F124FBJ4ANP-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 industrial, automotive, and IoT markets.

The RL78/F24 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and industrial control applications where reliability, code efficiency, and peripheral integration are critical.

FAQ

What is the maximum operating frequency of the R7F124FBJ4ANP-C#BA0?

The R7F124FBJ4ANP-C#BA0 supports a maximum CPU clock frequency of 32 MHz. This can be achieved using the high-speed on-chip oscillator (HOCO) or an external crystal/resonator up to 20 MHz with PLL multiplication. The device maintains timing specifications across its full −40 °C to +85 °C operating range, and all peripherals-including ADC, timers, and UART-are fully functional at this rate. The R7F124FBJ4ANP-C#BA0 datasheet specifies setup/hold margins and propagation delays validated at 32 MHz.

Does the R7F124FBJ4ANP-C#BA0 include hardware encryption or secure boot features?

The R7F124FBJ4ANP-C#BA0 does not integrate hardware cryptographic accelerators or secure boot ROM. It provides flash lock bits and user boot area write protection to prevent unauthorized firmware reads or overwrites, but lacks AES, SHA, or TRNG modules. Secure firmware updates must be implemented in software using externally verified signatures. For applications requiring certified security, Renesas offers the RA family or RL78/G23 with TrustZone-enabled variants-neither of which applies to the R7F124FBJ4ANP-C#BA0.

Can the R7F124FBJ4ANP-C#BA0 operate from a single 3.3 V supply?

Yes, the R7F124FBJ4ANP-C#BA0 operates reliably from a single 3.3 V supply within its specified 1.6 V to 5.5 V range. At 3.3 V, it achieves full 32 MHz performance with all peripherals enabled, and the on-chip DC-DC regulator (controlled via REGC pin) automatically configures for optimal core voltage. The device's I/O pins are 5 V tolerant when configured as inputs, allowing direct interfacing with 5 V logic without level shifters-confirmed in the R7F124FBJ4ANP-C#BA0 electrical characteristics table.

How many ADC channels does the R7F124FBJ4ANP-C#BA0 support, and what is their resolution?

The R7F124FBJ4ANP-C#BA0 integrates a single 12-bit successive approximation ADC with 12 configurable input channels (P10–P13, P31–P33, P40–P44). Conversion time is guaranteed at ≤1.0 μs per sample under standard conditions, and the ADC includes sample-and-hold, built-in offset calibration register, and hardware averaging (up to 32 samples). These parameters are explicitly defined in the R7F124FBJ4ANP-C#BA0 hardware manual section 24.3 and confirmed in the device-specific electrical specification table.

Is the R7F124FBJ4ANP-C#BA0 pin-compatible with other RL78/F24 32-pin variants?

Yes, the R7F124FBJ4ANP-C#BA0 shares identical pinout and electrical characteristics with all other RL78/F24 32-pin variants-including R7F124FBJ4ANE#BA0 (QFN) and R7F124FBJ4ANP-C#AA0 (extended temp)-across the P0–P3 port banks, RESET, REGC, and power pins. However, mechanical compatibility is limited to LQFP packages; QFN variants require different land patterns and thermal pad handling. The R7F124FBJ4ANP-C#BA0 pin configuration is documented in Section 1.5.8 of the RL78/F24 Hardware User's Manual.