Renesas R5F10278GNA#05

Overview

R5F10278GNA#05 from Renesas Electronics is a 24-pin HWQFN-packaged RL78/G12 16-bit microcontroller designed for industrial embedded control. It integrates 8 KB code flash, 2 KB data flash, 512 B RAM, 10-bit A/D converter (11 channels), and operates from 1.8 V to 5.5 V across –40°C to +105°C. Its ultra-low power consumption (63 μA/MHz), dual on-chip oscillators (1–24 MHz ±1.0% accuracy), and DMA controller support battery-powered sensor nodes and motor control interfaces.

For engineers reviewing the R5F10278GNA#05 datasheet, R5F10278GNA#05 pinout, R5F10278GNA#05 application, or R5F10278GNA#05 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in industrial temperature-grade systems, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The R5F10278GNA#05 implements the RL78 CPU core with CISC architecture, 3-stage pipeline, and 1 MB address space. It supports HALT/STOP/SNOOZE low-power modes and features a high-speed on-chip oscillator (1–24 MHz) with ±1.0% accuracy over –20°C to +85°C and ±2.0% over –40°C to +105°C - matching its G-grade industrial rating.

It includes two DMA channels, CRC operation, RAM/SFR guard safety functions, and peripheral sets including UART0, CSI00/CSI01, IIC00/IIC01, TAU0 (4-channel 16-bit timer), and 12-bit interval timer. All peripherals are accessible via 22 I/O pins (including 2× 6-V-tolerant N-ch open-drain) in the 4×4 mm HWQFN package.

Key Specifications

Pinout & Package

Package: HWQFN-24 (4 × 4 mm, 0.5 mm pitch), exposed die pad (recommended connection to VSS). Pinout validated per Renesas R01DS0193EJ0250 Rev.2.50, Figure 1.4.2 (Top View).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10278GNA#05, R5F1027AGNA#05 offers scalable memory for complex firmware while maintaining identical industrial-grade timing and safety features; R5F10378GNA#05 sacrifices data flash, DMA, and safety logic to reduce cost - making it unsuitable for applications requiring field-updatable parameters or functional safety assurance.

Availability

R5F10278GNA#05 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, programmable power supplies, and HMI keypad designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for R5F10278GNA#05 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 automotive, industrial, and IoT markets.

The RL78/G12 product line is engineered for ultra-low-power general-purpose embedded control - balancing energy efficiency, integrated analog peripherals, and industrial-grade reliability in compact packages like HWQFN-24.

FAQ

What is the maximum operating frequency and accuracy of the on-chip oscillator in R5F10278GNA#05?

The R5F10278GNA#05 features a high-speed on-chip oscillator supporting frequencies from 1 MHz to 24 MHz. Its accuracy is ±1.0% over –20°C to +85°C and ±2.0% over the full –40°C to +105°C industrial range - validated per Renesas R01DS0193EJ0250 Rev.2.50 Section 1.3.2. This eliminates need for external crystals in many timing-tolerant applications while maintaining G-grade reliability.

Does R5F10278GNA#05 include data flash memory, and what is its endurance?

Yes, the R5F10278GNA#05 integrates 2 KB of data flash memory with 1,000,000 write/erase cycles (typical) and background operation (BGO) capability. This allows concurrent code execution and parameter storage - critical for logging sensor data or storing calibration values without halting application flow. The feature is exclusive to R5F102x series, not present in R5F103x variants.

What safety features are implemented in R5F10278GNA#05?

The R5F10278GNA#05 includes CRC calculation unit, RAM guard, and SFR guard - hardware mechanisms that detect memory corruption and unauthorized register access. These features support functional safety development per IEC 61508 SIL-2 requirements. They are absent in the R5F10378GNA#05, confirming R5F10278GNA#05's suitability for safety-aware industrial control.

How many I/O pins does R5F10278GNA#05 provide, and what are their voltage tolerances?

The R5F10278GNA#05 provides 22 usable I/O pins in its 24-pin HWQFN package. Among these, two pins (P60 and P61) are 6-V-tolerant N-ch open-drain I/O for I²C bus interfacing, while others operate at VDD tolerance (1.8–5.5 V). All pins support programmable pull-up, TTL input buffer, and key interrupt functionality - enabling direct interface with 1.8 V, 2.5 V, and 3.3 V peripherals.

Can R5F10278GNA#05 operate in ultra-low-power modes, and what are their typical currents?

Yes, the R5F10278GNA#05 supports HALT, STOP, and SNOOZE modes. In STOP mode, typical current is 0.52 μA (VDD = 3.0 V, TA = 25°C) with RAM retention; HALT mode draws 63 μA/MHz during active operation. These values are measured and specified in Renesas R01DS0193EJ0250 Rev.2.50 Section 1.1 - enabling multi-year battery life in intermittent-sensing applications.