Renesas R5F10278GNA#45

Overview

R5F10278GNA#45 from Renesas Electronics is a 24-pin HWQFN-packaged RL78/G12 16-bit microcontroller designed for industrial embedded control at extended temperature (–40°C to +105°C). It integrates 8 KB code flash, 2 KB data flash, 512 B RAM, 10-bit A/D converter (11 channels), 2-channel DMA, and dual serial interfaces (2× CSI, 2× I²C, 1× UART) operating from 1.8 V to 5.5 V with true low-power HALT/STOP/SNOOZE modes.

For engineers reviewing the R5F10278GNA#45 datasheet, R5F10278GNA#45 pinout, R5F10278GNA#45 application, or R5F10278GNA#45 equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-temperature operation, and real-world substitution guidance - all grounded in Renesas' official R01DS0193EJ0250 Rev.2.50 documentation.

Technical Context

The R5F10278GNA#45 implements the RL78 CPU core with 3-stage pipeline, 1 MB address space, and configurable instruction timing (0.04167 µs min @ 24 MHz). Its on-chip high-speed oscillator supports 1–24 MHz with ±1.0% accuracy over –20°C to +85°C and ±2.0% over –40°C to +105°C, enabling precise timing without external crystals in cost-sensitive industrial designs.

It features CRC calculation hardware, RAM guard, SFR guard, and self-programming capability with flash shield window - security and reliability features absent in R5F103-series variants. Peripheral I/O redirection (PIOR) allows flexible pin assignment for UART, CSI, and I²C functions across shared pins like P10–P12 and P40–P42.

Key Specifications

Pinout & Package

Package: HWQFN-24, 4 mm × 4 mm, 0.5 mm pitch, exposed die pad (to be connected to VSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10278GNA#45, R5F1027AGNA#45 offers headroom for future firmware expansion without PCB change, while R5F10378GNA#45 sacrifices data retention, deterministic timing, and memory protection - making it viable only in non-critical, cost-driven applications.

Availability

R5F10278GNA#45 is available at Aetrix Electronics and suitable for industrial motor control, smart HVAC systems, portable scanners, and programmable logic relays requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for R5F10278GNA#45 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 specializing in microcontrollers, analog, and power solutions for automotive, industrial, and IoT markets.

The RL78/G12 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive industrial control, sensor hubs, and appliance applications - balancing performance, integration, and energy efficiency.

FAQ

What is the maximum operating frequency and accuracy of the on-chip oscillator for R5F10278GNA#45?

The R5F10278GNA#45 features a high-speed on-chip oscillator adjustable from 1 MHz to 24 MHz. At –40°C to +105°C (G-grade), its frequency accuracy is ±2.0%, verified per Renesas R01DS0193EJ0250 Rev.2.50. This enables reliable timing in industrial environments without external crystals, reducing BOM cost and board area.

Does R5F10278GNA#45 support background data flash rewriting during program execution?

Yes, R5F10278GNA#45 supports Background Operation (BGO) for data flash. While executing code from program memory, it can simultaneously rewrite the 2 KB data flash - critical for logging sensor data or storing calibration parameters without interrupting real-time control loops.

How many analog input channels does R5F10278GNA#45 provide, and what is their resolution?

R5F10278GNA#45 provides 11 analog input channels (ANI0–ANI3, ANI16–ANI22) with 10-bit resolution and an internal 1.45 V reference. It also integrates a calibrated on-die temperature sensor - eliminating need for external thermal ICs in ambient monitoring applications.

What safety-related hardware features are included in R5F10278GNA#45?

R5F10278GNA#45 includes CRC calculation hardware, RAM guard, and SFR guard - features absent in the R5F103 series. These enable memory integrity checking and prevent unintended register corruption, supporting functional safety requirements such as IEC 61508 SIL2 in industrial control systems.

Can R5F10278GNA#45 operate from a 1.8 V supply, and what peripherals remain functional at that voltage?

Yes, R5F10278GNA#45 operates from 1.8 V to 5.5 V. At 1.8 V, all core functions remain active: 10-bit A/D converter (with internal reference), 2-channel DMA, UART, CSI, I²C, TAU timers, and ultra-low-power STOP mode (0.52 μA). This enables direct interfacing with 1.8 V sensors and logic without level shifters.