Renesas R5F104JEAFA#X0

Overview

R5F104JEAFA#X0 from Renesas is a 52-pin LQFP-0.65mm 8-bit RL78/G14 microcontroller with 256 KB flash, 20 KB RAM, and 8 KB data flash, operating from 1.6–5.5 V at -40°C to +85°C (industrial A-grade). It delivers 44 DMIPS at 32 MHz, features ultra-low power consumption (66 μA/MHz active, 0.60 μA RTC+LVD), and integrates UART, I²C, SPI, 12-bit ADC (20 ch), RTC, and hardware DTC/ELC for embedded control in battery-powered and industrial systems.

For engineers reviewing the R5F104JEAFA#X0 datasheet, R5F104JEAFA#X0 pinout, R5F104JEAFA#X0 application, or R5F104JEAFA#X0 equivalent, key selection criteria include its 52-pin LQFP-0.65mm package, 256 KB code flash with self-programming and flash shield window, 20 KB RAM, integrated real-time clock with calendar/alarm, and support for LIN-bus via UART - all critical for cost-sensitive, low-power industrial HMI and sensor node designs.

Technical Context

The R5F104JEAFA#X0 implements the RL78 CPU core with CISC architecture, 3-stage pipeline, and configurable instruction timing (0.03125 μs @ 32 MHz to 30.5 μs @ 32.768 kHz). It supports multiply/divide/accumulate instructions and a 1 MB address space across four register banks.

Its peripheral set includes Timer Array Unit (TAU) with up to 8 channels, 12-bit interval timer, watchdog timer with dedicated low-speed oscillator, and Event Link Controller (ELC) enabling direct hardware-triggered peripheral chaining without CPU intervention - reducing latency and power in deterministic real-time control loops.

Key Specifications

Pinout & Package

Package: 52-pin LQFP, 10 × 10 mm, 0.65 mm pitch (JEDEC MS-026AC), lead-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F104JGAFA#X0 and R5F104JHAFA#X0, the R5F104JEAFA#X0 provides 64 KB more flash and 4 KB more RAM than the JHA variant and 64 KB more flash than the JGA variant - directly enabling larger protocol stacks (e.g., Modbus TCP offload), extended data logging, or dual-application partitioning without external memory.

Availability

R5F104JEAFA#X0 is available at Aetrix Electronics and suitable for industrial HMI panels, battery-powered sensor nodes, smart energy meter interfaces, and automated test equipment fixtures requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for R5F104JEAFA#X0 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 targets cost-effective, ultra-low-power general-purpose embedded control - optimized for industrial automation, home appliances, and sensor edge devices requiring robust peripheral integration and long operational life.

FAQ

What is the maximum operating frequency and corresponding performance of the R5F104JEAFA#X0?

The R5F104JEAFA#X0 operates at up to 32 MHz with an RL78 CPU core delivering 44 DMIPS. Its high-accuracy on-chip oscillator maintains ±1.0% tolerance across 1.8–5.5 V and -20 to +85°C, eliminating need for external crystal in many applications. The R5F104JEAFA#X0 supports configurable instruction timing - from 0.03125 μs (high-speed mode) to 30.5 μs (ultra-low-speed mode) - enabling dynamic power/performance scaling.

Does the R5F104JEAFA#X0 support LIN bus communication, and how is it implemented?

Yes, the R5F104JEAFA#X0 supports LIN 2.2 and SAE J2602 protocols via its UART peripherals. Hardware-level LIN frame generation, sync-break detection, and checksum calculation are handled internally - no software bit-banging required. This enables reliable LIN node implementation with minimal CPU overhead, and the R5F104JEAFA#X0's 52-pin LQFP package provides dedicated UART pins (e.g., P13/P14) for direct connection to LIN transceivers.

What are the flash memory configuration and security features of the R5F104JEAFA#X0?

The R5F104JEAFA#X0 includes 256 KB of on-chip code flash memory organized in 1 KB blocks, with support for self-programming, boot swap functionality, and flash shield window protection. The flash shield window prevents unauthorized read-out of protected code regions, while block erase prohibition enhances firmware integrity. Additionally, the R5F104JEAFA#X0 provides 8 KB of data flash rated for 1,000,000 write cycles, supporting background operation (BGO) for concurrent program execution and data logging.

How does the R5F104JEAFA#X0 achieve ultra-low power consumption in real-world applications?

The R5F104JEAFA#X0 achieves ultra-low power via multiple hardware-optimized modes: 66 μA/MHz active current, 0.60 μA in STOP mode with RTC and LVD active, and configurable HALT/SNOOZE modes. Its on-chip voltage detector (LVD) offers 14 programmable threshold levels for precise brown-out detection, and the dedicated low-speed on-chip oscillator powers the watchdog timer independently - allowing full system shutdown while retaining timekeeping and safety monitoring. These features make the R5F104JEAFA#X0 ideal for battery-backed industrial controls.

What development tools and ecosystem support are available for the R5F104JEAFA#X0?

Renesas provides comprehensive support for the R5F104JEAFA#X0, including the CS+ IDE with compiler and debugger, e² studio (Eclipse-based), and the Renesas Flash Programmer for programming. Hardware tools include the E2 emulator Lite and E2 emulator for debugging, and evaluation boards such as the RL78/G14 Fast Prototyping Board. The R5F104JEAFA#X0 is supported by the RL78/G14 Target Package in the Renesas Synergy™ Platform and third-party RTOS integrations (FreeRTOS, Micrium µC/OS).