Renesas R5F104MJAFA#V0

Overview

R5F104MJAFA#V0 from Renesas is a 80-pin LQFP-0.65mm, 256 KB flash, 20 KB RAM RL78/G14 16-bit MCU with ultra-low-power operation (66 μA/MHz), integrated RTC, 10-bit ADC (20 channels), and dual UART/LIN interfaces - deployed in industrial motor control and smart sensor nodes requiring extended battery life and deterministic real-time response.

For engineers reviewing the R5F104MJAFA#V0 datasheet, R5F104MJAFA#V0 pinout, R5F104MJAFA#V0 application, or R5F104MJAFA#V0 equivalent, key selection criteria include its -40°C to +85°C industrial temperature grade, 1.6–5.5 V wide supply range, on-chip debug support, and compatibility with Renesas' CS+ and e² studio toolchains for rapid firmware development and low-power mode validation.

Technical Context

The R5F104MJAFA#V0 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.03125 μs (32 MHz) to 30.5 μs (32.768 kHz), and includes multiply/divide/accumulate instructions. Its memory subsystem integrates 256 KB code flash (1 KB block size), 8 KB data flash (1M rewrite cycles), and 20 KB SRAM with flash library RAM reservation at F9F00H.

Peripherals include Timer Array Unit (TAU) with 8 channels, Real-Time Clock with calendar/alarm/correction, 10-bit ADC (20 inputs, internal 1.45 V reference), dual UART/LIN, up to 10 I²C channels, and Event Link Controller (ELC) enabling hardware-triggered peripheral chaining without CPU intervention.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (14 × 14 mm, 0.65 mm pitch), RoHS-compliant, industrial-grade (TA = −40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F104LJAFA#V0 and R5F104MJAFB#V0, the R5F104MJAFA#V0 offers optimal balance of I/O scalability (80 pins), memory headroom (256 KB flash), and LQFP manufacturability - making it ideal for next-generation industrial controllers where future firmware expansion and mixed-voltage peripheral integration are design priorities.

Availability

R5F104MJAFA#V0 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, home appliance UIs, and PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for R5F104MJAFA#V0 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 is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/G14 product line delivers true low-power 16-bit MCUs optimized for cost-sensitive industrial and consumer applications demanding robust real-time performance, extended battery life, and seamless toolchain integration.

FAQ

What is the maximum operating frequency and corresponding power consumption of the R5F104MJAFA#V0?

The R5F104MJAFA#V0 operates up to 32 MHz with a typical active current of 66 μA per MHz at VDD = 3.3 V and TA = 25°C. At full speed, this yields ~2.1 mA total active current. Its ultra-low-power STOP mode draws only 0.60 μA while maintaining RTC and LVD functionality - critical for energy harvesting and battery-backed systems.

Does the R5F104MJAFA#V0 support LIN bus communication, and how is it implemented?

Yes, the R5F104MJAFA#V0 supports LIN 2.2 via its UART peripherals. It implements LIN using UART auto-synchronization, break detection, and checksum calculation in hardware - eliminating software overhead. The UART's built-in LIN mode handles frame timing, identifier filtering, and response generation, enabling reliable slave-node operation in automotive body electronics and industrial networks.

What is the flash memory organization and security capability of the R5F104MJAFA#V0?

The R5F104MJAFA#V0 contains 256 KB of on-chip code flash organized in 1 KB blocks. It supports flash security features including block erase/write prohibition and flash shield window configuration - preventing unauthorized readout or modification of protected regions. These mechanisms are enforced by dedicated hardware registers and require unlock sequences, meeting IEC 62443-3-3 requirements for secure firmware updates.

Can the R5F104MJAFA#V0 operate from a single 1.8 V supply, and what peripherals remain functional?

Yes, the R5F104MJAFA#V0 supports 1.6–5.5 V operation, including stable 1.8 V supply. At 1.8 V, all core functions, 10-bit ADC (with internal 1.45 V reference), RTC, low-speed timers, and most I/O (including 1.8 V-tolerant pins) remain fully operational. High-speed peripherals like 32 MHz operation and certain analog comparators are disabled below 2.4 V per datasheet limits.

How does the Event Link Controller (ELC) improve real-time performance in the R5F104MJAFA#V0?

The ELC in the R5F104MJAFA#V0 enables direct hardware triggering between 19–26 peripheral events - for example, linking an ADC conversion completion directly to a DMA transfer or a timer compare match to a GPIO toggle - without CPU or interrupt latency. This reduces jitter in time-critical tasks like motor commutation or sensor sampling, improves determinism, and lowers average CPU utilization by up to 30% in event-driven architectures.