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Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

Renesas R5F10278DNA#W0

Name: R5F10278DNA#W0
Brand: Renesas
SKU: R5F10278DNA#W0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: R5F10278DNA#W0

Manufacturer:: Renesas

Category:: Microcontrollers

Package:: 24-WFQFN Exposed Pad

Datasheet:: R5F10278DNA#W0.pdf

Description:: IC MCU 16BIT 8KB FLASH 24HWQFN

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Product details

Overview

R5F10278DNA#W0 from Renesas Electronics is a 24-pin HWQFN-packaged RL78/G12 16-bit microcontroller designed for ultra-low-power embedded control in industrial-grade applications. It integrates 8 KB code flash, 2 KB data flash, 512 B RAM, operates from 1.8–5.5 V, delivers 31 DMIPS at 24 MHz, and supports HALT/STOP/SNOOZE power modes for battery-powered sensors and motor controllers.

For engineers reviewing the R5F10278DNA#W0 datasheet, R5F10278DNA#W0 pinout, R5F10278DNA#W0 application, or R5F10278DNA#W0 equivalent, key selection criteria include its 2-channel DMA, 2 KB data flash with 1M rewrite cycles, 10-bit 11-channel ADC, dual simplified SPI/I²C interfaces, and industrial temperature range (−40°C to +85°C) with D-grade qualification.

Technical Context

The R5F10278DNA#W0 implements the RL78 CPU core with 3-stage pipeline CISC architecture, 1 MB address space, and configurable instruction execution time (0.04167 µs at 24 MHz). Its clock system combines a high-accuracy ±1.0% on-chip oscillator (1–24 MHz) with external crystal support (1–20 MHz) and a dedicated 15 kHz low-speed oscillator for watchdog timing.

Peripheral integration includes TAU0 16-bit timer (4 channels), window watchdog timer, 12-bit interval timer, SAU0 serial array unit supporting UART0, CSI00/CSI01, and IIC00/IIC01, plus CRC calculation and RAM/SFR guard functions-features exclusive to R5F102-series devices and absent in R5F103 variants.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	RL78 16-bit CISC with 3-stage pipeline; enables deterministic real-time control with 0.04167 µs min instruction cycle at 24 MHz.
Memory	8 KB code flash (1 KB blocks), 2 KB data flash (1M rewrite cycles), 512 B RAM; supports background operation and flash shield window security.
Power & Temp	1.8–5.5 V supply; −40°C to +85°C operating range (D-grade); ultra-low 63 µA/MHz active current enables multi-year battery life.
Analog Peripherals	10-bit 11-channel ADC with internal 1.45 V reference and temperature sensor; AVREFP/AVREFM pins enable ratiometric sensing.
Serial Interfaces	UART0 (1 channel), CSI00/CSI01 (2 simplified SPI), IIC00/IIC01 (2 simplified I²C); no standard I²C master-only simplified protocol.
Timers & Control	TAU0 16-bit timer (4 channels, PWM-capable), 12-bit interval timer, window watchdog timer; supports precise motor commutation and pulse generation.
Security & Safety	CRC calculation unit, RAM guard, SFR guard, and block-level flash erase prohibition-enables functional safety compliance in industrial systems.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
P00–P03	Port 0 I/O with key return (KR6–KR9)	Configurable CMOS I/O; KR function enables low-power wake-up from keypad input without CPU intervention.
P10–P14	Port 1 I/O with analog inputs (ANI16–ANI20), SCK00/SCL00, SI00/RxD0/SDA00, SO00/TxD0	Primary serial interface bank: supports UART0, CSI00, and IIC00 simultaneously via peripheral redirection register (PIOR).
P20–P23	Port 2 I/O with analog inputs (ANI0–ANI3), AVREFP/AVREFM	Analog front-end: AVREFP/AVREFM set ADC reference; ANI0–ANI3 are rail-to-rail input channels with 6 V-tolerant N-ch open-drain option.
P40–P42	Port 4 I/O with analog inputs (ANI21–ANI22), SCK01/SCL01, SO01/SDA01, SI01/RESET	Secondary serial interface bank (CSI01/IIC01) and hardware reset; SI01 doubles as RESET with internal pull-up.
P60/P61	Port 6 I/O with SCLA0/SDAA0 (IICA0)	Dedicated I²C bus interface (SCLA0/SDAA0) with 6 V-tolerant N-ch open-drain outputs for mixed-voltage system interfacing.
P121/P122	Crystal oscillator inputs (X1/X2/EXCLK)	Supports external crystal (1–20 MHz) or external clock source; enables precise timing for communication or sampling synchronization.
VDD/VSS	Power supply and ground	VDD accepts 1.8–5.5 V; VSS reference for all analog/digital domains; exposed pad must connect to VSS for thermal and EMI performance.

Key Features

Feature	Design Value
Ultra-low-power operation	63 µA/MHz active current, HALT/STOP/SNOOZE modes reduce leakage to sub-µA levels-ideal for energy-harvesting and battery-backed systems.
Data flash with BGO	2 KB data flash supports background operation (BGO): firmware can execute from code flash while rewriting data flash-no interrupt latency penalty.
Dual simplified serial interfaces	2 independent CSI/IIC channels enable concurrent communication with multiple peripherals (e.g., sensor hub + display driver) without software arbitration.
Hardware safety extensions	CRC unit, RAM guard, and SFR guard detect memory corruption and unauthorized register writes-reduces need for external safety monitors in IEC 61508 designs.
Industrial-grade reliability	D-grade qualification (−40°C to +85°C), 12-level voltage detector with interrupt/reset options, and POR circuit ensure robust operation in harsh factory environments.

Applications

Smart Sensor Node	Industrial Motor Controller
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure with wireless telemetry. IC Role / Device Role / Timing Role: Main system controller managing ADC sampling, data preprocessing, low-power sleep scheduling, and UART-based BLE module interface. Use Value: 2 KB data flash stores calibration coefficients and event logs; 63 µA/MHz active current extends 10-year battery life; SNOOZE mode enables wake-on-interrupt with <1 µs latency.	Use Scenario: Closed-loop BLDC motor drive in HVAC blowers with Hall-effect feedback and PWM-controlled inverter stage. IC Role / Device Role / Timing Role: Real-time motion controller executing FOC algorithms, generating 3-phase PWM, monitoring overcurrent via ADC, and communicating status via UART. Use Value: TAU0 4-channel timer provides synchronized PWM outputs; 10-bit 11-channel ADC samples current/voltage at 1 MS/s; industrial temp grade ensures reliability at 85°C ambient.
Programmable Logic Controller (PLC) I/O Module	Energy Metering Front-End
Use Scenario: DIN-rail mounted digital I/O expansion module with opto-isolated inputs and relay drivers for factory automation. IC Role / Device Role / Timing Role: Interface processor handling GPIO scanning, debounce logic, watchdog supervision, and Modbus RTU over RS-485. Use Value: 24-pin HWQFN fits compact PCB layout; KR0–KR9 key return pins reduce polling overhead; 12-level LVD detects brown-out before PLC fault shutdown.	Use Scenario: Residential smart meter measuring voltage, current, and power factor using shunt/CT sensors and metrology IC interface. IC Role / Device Role / Timing Role: Metrology co-processor reading SPI-based ADC registers, computing RMS values, storing billing data in data flash, and updating LCD via SCL01/SDA01. Use Value: Dual CSI channels allow simultaneous ADC readout and display refresh; 2 KB data flash retains 30 days of consumption history with 1M rewrite endurance.

Smart Sensor Node

Industrial Motor Controller

Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure with wireless telemetry.

IC Role / Device Role / Timing Role: Main system controller managing ADC sampling, data preprocessing, low-power sleep scheduling, and UART-based BLE module interface.

Use Value: 2 KB data flash stores calibration coefficients and event logs; 63 µA/MHz active current extends 10-year battery life; SNOOZE mode enables wake-on-interrupt with <1 µs latency.

Use Scenario: Closed-loop BLDC motor drive in HVAC blowers with Hall-effect feedback and PWM-controlled inverter stage.

IC Role / Device Role / Timing Role: Real-time motion controller executing FOC algorithms, generating 3-phase PWM, monitoring overcurrent via ADC, and communicating status via UART.

Use Value: TAU0 4-channel timer provides synchronized PWM outputs; 10-bit 11-channel ADC samples current/voltage at 1 MS/s; industrial temp grade ensures reliability at 85°C ambient.

Programmable Logic Controller (PLC) I/O Module

Energy Metering Front-End

Use Scenario: DIN-rail mounted digital I/O expansion module with opto-isolated inputs and relay drivers for factory automation.

IC Role / Device Role / Timing Role: Interface processor handling GPIO scanning, debounce logic, watchdog supervision, and Modbus RTU over RS-485.

Use Value: 24-pin HWQFN fits compact PCB layout; KR0–KR9 key return pins reduce polling overhead; 12-level LVD detects brown-out before PLC fault shutdown.

Use Scenario: Residential smart meter measuring voltage, current, and power factor using shunt/CT sensors and metrology IC interface.

IC Role / Device Role / Timing Role: Metrology co-processor reading SPI-based ADC registers, computing RMS values, storing billing data in data flash, and updating LCD via SCL01/SDA01.

Use Value: Dual CSI channels allow simultaneous ADC readout and display refresh; 2 KB data flash retains 30 days of consumption history with 1M rewrite endurance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
R5F1027ADNA#W0	Same package and pinout; 16 KB code flash, 1.5 KB RAM, identical peripherals including 2 KB data flash and DMA.	Higher flash/RAM suits larger firmware (e.g., OTA update stacks or complex UI logic) but increases cost and power in minimal-control use cases.	Select when firmware size exceeds 8 KB or additional RAM is required for real-time buffers or stack depth.
R5F1037ADNA#W0	No data flash, no DMA, no CRC/RAM/SFR guard, ±5.0% oscillator accuracy; otherwise identical pinout and core.	Lacks data logging, safety-critical features, and high-accuracy timing-suitable only for cost-sensitive, non-safety applications like basic appliance control.	Choose only if data flash, DMA, and industrial oscillator tolerance are unnecessary and BOM cost is primary constraint.

Compared with R5F10278DNA#W0, R5F1027ADNA#W0 offers headroom for firmware growth without changing PCB layout, while R5F1037ADNA#W0 sacrifices critical reliability features to reduce unit cost-making it unsuitable for applications requiring field data persistence or functional safety.

Availability

R5F10278DNA#W0 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and energy metering front-ends requiring stable component supply across extended product lifecycles.

Supply support for R5F10278DNA#W0 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 targets cost-sensitive, ultra-low-power embedded control applications in industrial equipment, home appliances, and sensor systems-emphasizing energy efficiency, integrated safety features, and seamless toolchain compatibility with e2 studio and CS+.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating for R5F10278DNA#W0?

The R5F10278DNA#W0 achieves a maximum operating frequency of 24 MHz using its high-speed on-chip oscillator, delivering 31 DMIPS performance. This is measured under HS (high-speed main) mode with VDD ≥ 2.7 V; at lower voltages (1.8–2.4 V), max frequency drops to 16 MHz per datasheet specifications.

Does R5F10278DNA#W0 support true I²C master functionality or only simplified I²C?

R5F10278DNA#W0 implements simplified I²C (IIC00/IIC01) as defined in the RL78/G12 documentation-not full-standard I²C. It lacks automatic clock stretching, 10-bit addressing, and arbitration recovery. For full I²C compliance, external level-shifting or protocol translation is required.

How is the 2 KB data flash in R5F10278DNA#W0 utilized in practice?

The 2 KB data flash in R5F10278DNA#W0 is used for nonvolatile storage of calibration data, device configuration, event logs, or firmware parameters. It supports background operation (BGO), allowing program execution from code flash during write/erase cycles, and guarantees 1,000,000 rewrite cycles at VDD = 1.8–5.5 V.

What power-saving modes are available on R5F10278DNA#W0 and their typical current draw?

R5F10278DNA#W0 supports HALT (sub-µA), STOP (0.52 µA typical), and SNOOZE (1.3 µA typical) modes. HALT halts CPU while preserving RAM; STOP disables oscillators and most peripherals; SNOOZE keeps selected peripherals (e.g., UART, ADC) active for wake-on-event-enabling responsive low-power operation.

Is the R5F10278DNA#W0 pin-compatible with other RL78/G12 24-pin variants?

Yes, R5F10278DNA#W0 shares identical 24-pin HWQFN pinout and electrical characteristics with all R5F1027x and R5F1037x variants (e.g., R5F1027ADNA#W0, R5F1037ADNA#W0). However, peripheral availability (e.g., data flash, DMA, CRC) differs between R5F102 and R5F103 families-requiring firmware validation after substitution.

R5F10278DNA#W0 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Package/Case:: 24-WFQFN Exposed Pad

Series:: RL78/G12

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Core Processor:: RL78

Core Size:: 16-Bit

Speed:: 24MHz

Connectivity:: CSI, I2C, UART/USART

Peripherals:: DMA, LVD, POR, PWM, WDT

Number of I/O:: 18

Program Memory Size:: 8KB (8K x 8)

Program Memory Type:: FLASH

EEPROM Size:: 2K x 8

RAM Size:: 768 x 8

Voltage - Supply (Vcc/Vdd):: 1.8V ~ 5.5V

Data Converters:: A/D 11x8/10b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

R5F10278DNA#W0 FAQ

1.How can I place an order for R5F10278DNA#W0 through Aetrix?

Please submit a Request for Quotation (RFQ) for R5F10278DNA#W0 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for R5F10278DNA#W0 reliable?

The price and inventory of R5F10278DNA#W0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F10278DNA#W0 is usually 5 days.

3.What payment methods are accepted for R5F10278DNA#W0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F10278DNA#W0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for R5F10278DNA#W0?

R5F10278DNA#W0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your R5F10278DNA#W0 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for R5F10278DNA#W0?

For technical support, including R5F10278DNA#W0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F10278DNA#W0 requirements.

6.How does Aetrix verify that R5F10278DNA#W0 is sourced from the original manufacturer or authorized distributors?

All R5F10278DNA#W0 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that R5F10278DNA#W0 meets industry standards.

7.What is the process for return or replacement of R5F10278DNA#W0?

All R5F10278DNA#W0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F10278DNA#W0, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The R5F10278DNA#W0 part is unused and in its original packaging.

Return procedure for R5F10278DNA#W0:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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