Renesas R4F24259DWFAU

Overview

R4F24259DWFAU from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/2425 Group, featuring 512 KB on-chip Flash memory, 32 KB RAM, and a maximum operating frequency of 33 MHz. It integrates a 16-bit H8S CPU core, TPU (16-bit timer pulse unit), SCI (serial communication interface), WDT (watchdog timer), and CPG (clock pulse generator). It targets industrial control applications requiring deterministic real-time response and embedded I/O management.

For engineers reviewing the R4F24259DWFAU datasheet, R4F24259DWFAU pinout, R4F24259DWFAU application, or R4F24259DWFAU equivalent, key selection criteria include Flash/RAM capacity, peripheral set (TPU/SCI/WDT), operating voltage range (3.0–3.6 V), and QFP-100 package compatibility with legacy H8S/2400 designs.

Technical Context

The R4F24259DWFAU implements the H8S/2000-compatible CPU architecture with enhanced addressing modes and extended register sets. It supports five MCU operating modes (Mode 1–5, Mode 7) controlled via MDCR and SYSCR registers, enabling flexible memory mapping and peripheral enablement.

Its peripheral subsystem includes a 16-bit TPU with 8 channels for PWM generation and input capture, dual SCI modules supporting asynchronous communication at up to 2 Mbps, and a programmable watchdog timer with windowed timeout detection. All peripherals are synchronized to the internal bus clock derived from the CPG's PLL-based clock synthesis.

Key Specifications

Pinout & Package

Package: 100-pin plastic quad flat package (QFP), 14 mm × 14 mm, 0.5 mm lead pitch, JEDEC MS-026AC compliant. Thermal pad exposed on underside for enhanced heat dissipation in continuous industrial operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F24259DWFAU, R4F24258DWFAU offers lower memory capacity at reduced cost but identical real-time performance and peripheral timing behavior, while R4F24279DWFAU extends functionality with CAN and larger Flash-making it unsuitable as a drop-in replacement unless CAN is actively used.

Availability

R4F24259DWFAU is available at Aetrix Electronics and suitable for industrial PLC I/O modules, motor control drives, building automation controllers, and factory sensor gateways requiring stable component supply across multi-year production cycles.

Supply support for R4F24259DWFAU 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, with global design centers and manufacturing partnerships.

The H8S/2400 Series-including R4F24259DWFAU-is designed for deterministic real-time control in industrial automation, factory equipment, and building management systems where reliability, long-term availability, and legacy software compatibility are critical.

FAQ

What is the maximum operating frequency of the R4F24259DWFAU?

The R4F24259DWFAU operates at a maximum system clock frequency of 33 MHz. This is achieved using the on-chip CPG with PLL multiplication of an external crystal (1–8 MHz) or external clock source. At 33 MHz, the H8S CPU delivers approximately 33 MIPS, enabling hard real-time loop execution within sub-30 µs intervals for time-critical control tasks. The R4F24259DWFAU maintains full peripheral functionality-including TPU and SCI-at this maximum frequency.

Does the R4F24259DWFAU include an integrated ADC?

Yes, the R4F24259DWFAU includes a 10-bit successive-approximation ADC with up to 8 input channels, as documented in Section 12 of the H8S/2425 Group Hardware User's Manual (Rev. 3.00). The ADC supports software/start-triggered conversion, scan mode, and result storage in dedicated SFRs. It operates across the full −40°C to +85°C temperature range with ±2 LSB integral nonlinearity, making it suitable for direct sensor interfacing without external signal conditioning in many industrial applications.

What package type and pin count does the R4F24259DWFAU use?

The R4F24259DWFAU uses a 100-pin plastic quad flat package (QFP) with 0.5 mm lead pitch, designated as "DWFAU" in Renesas' ordering nomenclature. Its mechanical dimensions are 14 mm × 14 mm, and it complies with JEDEC standard MS-026AC. This package shares pin compatibility with other members of the H8S/2425 Group (e.g., R4F24258DWFAU), enabling hardware reuse across memory-variant SKUs in production designs.

Is the R4F24259DWFAU pin-compatible with earlier H8S/2400 series MCUs?

Yes, the R4F24259DWFAU is pin-compatible with the R4F2425 and R4F2427 family members in the same DWFAU package variant. Pin assignments-including VCC, VSS, RESET, XTAL/EXTAL, and all port pins-are identical across these devices. This allows direct PCB reuse when upgrading from older mask-ROM or smaller-Flash variants, provided the target application fits within the R4F24259DWFAU's 512 KB Flash and 32 KB RAM resources.

What industrial temperature grade is specified for the R4F24259DWFAU?

The R4F24259DWFAU is rated for industrial temperature operation from −40°C to +85°C, as confirmed in the H8S/2425 Group Hardware User's Manual (Rev. 3.00, Section 1.1.2) and Renesas' official product briefs. This rating applies across all specified operating voltages (3.0–3.6 V) and includes full functionality of Flash programming, RAM access, TPU timing accuracy, and SCI communication-without derating or reduced performance limits.