Renesas R5F10378ANA#W5

Overview

R5F10378ANA#W5 from Renesas Electronics is a 24-pin RL78/G12 16-bit microcontroller designed for ultra-low-power embedded control in consumer and industrial applications. It features 8 KB code flash, 512 B RAM, 10-bit 8-channel ADC, 1-channel UART, 1-channel simplified SPI (CSI), and operates from 1.8 V to 5.5 V with true low-power consumption (63 μA/MHz). It targets battery-powered sensor nodes and smart home peripherals requiring compact footprint and deterministic real-time response.

For engineers reviewing the R5F10378ANA#W5 datasheet, R5F10378ANA#W5 pinout, R5F10378ANA#W5 application, or R5F10378ANA#W5 equivalent, key selection criteria include its HWQFN-24 package, absence of data flash memory, -40°C to +85°C temperature grade (A), and lack of DMA or safety functions compared to R5F102 variants - critical for cost-sensitive, non-safety-critical control designs.

Technical Context

The R5F10378ANA#W5 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting minimum instruction execution time of 0.04167 µs at 24 MHz using the high-speed on-chip oscillator. Its clock system includes selectable internal frequencies (1–24 MHz) with ±5.0% accuracy over –40°C to +85°C and a dedicated 15 kHz low-speed on-chip oscillator for watchdog and interval timing.

Peripheral integration centers on single-channel UART, single-channel CSI, and TAU0 timer array with four 16-bit channels - sufficient for basic serial communication, PWM generation, and input capture in space-constrained applications. The device omits data flash, DMA, CRC, RAM/SFR guard, and simplified I²C, distinguishing it from R5F102-series counterparts in both feature set and functional safety capability.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10278ANA#W5, the R5F10378ANA#W5 reduces BOM cost by omitting data flash and safety logic while maintaining identical pinout and core performance; versus R5F10379ANA#W5, it trades 4 KB flash capacity for lower unit price in resource-constrained designs.

Availability

R5F10378ANA#W5 is available at Aetrix Electronics and suitable for smart home controllers, industrial sensor nodes, and portable medical monitors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for R5F10378ANA#W5 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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT markets.

The RL78/G12 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated embedded control applications where energy efficiency, small footprint, and rapid time-to-market are critical design priorities.

FAQ

What is the maximum operating frequency of the R5F10378ANA#W5?

The R5F10378ANA#W5 supports a maximum system clock frequency of 24 MHz using its high-speed on-chip oscillator. This yields 31 DMIPS performance and enables sub-42 ns minimum instruction execution time. External crystal oscillation up to 20 MHz is also supported via X1/X2 pins for higher precision timing requirements.

Does the R5F10378ANA#W5 include data flash memory?

No, the R5F10378ANA#W5 does not include data flash memory. As confirmed in Renesas documentation, R5F103-series devices omit the 2 KB data flash present in R5F102-series counterparts. Firmware must use code flash for parameter storage or rely on external EEPROM/FRAM if non-volatile data retention is required.

What package type and pin count does the R5F10378ANA#W5 use?

The R5F10378ANA#W5 uses a 24-pin HWQFN package (4 × 4 mm, 0.5 mm pitch) with an exposed die pad. The #W5 suffix specifically denotes embossed tape packaging for automated SMT assembly. Pin functions include 22 general-purpose I/Os, 8 analog inputs, UART, CSI, I²C, and timer resources distributed across Ports 0–6 and Port 12.

What is the operating temperature range for the R5F10378ANA#W5?

The R5F10378ANA#W5 is rated for an operating ambient temperature range of –40°C to +85°C, corresponding to the "A" (consumer) grade designation in its part number. It is qualified for industrial environments within this range but is not rated for extended high-temperature operation up to +105°C like "G" grade variants.

Can the R5F10378ANA#W5 be used as a drop-in replacement for R5F10278ANA#W5?

No, the R5F10378ANA#W5 is not a drop-in replacement for R5F10278ANA#W5. While pin-compatible, it lacks data flash, DMA, CRC, RAM/SFR guard, and has reduced oscillator accuracy (±5.0% vs. ±1.0%). Firmware relying on data flash writes or safety features will not function correctly without modification.