Renesas R5F10378ANA#25

Overview

R5F10378ANA#25 from Renesas Electronics is a 24-pin RL78/G12 16-bit microcontroller designed for ultra-low-power embedded control in consumer-grade applications (–40°C to +85°C). It integrates 8 KB code flash, 512 B RAM, 10-bit A/D converter with 8 channels, 4-channel 16-bit timer, and single UART interface - all operating from 1.8 V to 5.5 V supply. It targets battery-powered sensor nodes and smart home peripherals requiring deterministic real-time response and minimal standby current.

For engineers reviewing the R5F10378ANA#25 datasheet, R5F10378ANA#25 pinout, R5F10378ANA#25 application, or R5F10378ANA#25 equivalent, key selection criteria include its HWQFN-24 package, absence of data flash memory, reduced peripheral count versus R5F102 variants, and ±5.0% high-speed on-chip oscillator accuracy over full temperature range.

Technical Context

The R5F10378ANA#25 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 internal oscillator. Its clock system includes selectable high-speed on-chip oscillator (1–24 MHz) and low-speed 15 kHz on-chip oscillator, but excludes DMA controller and CRC hardware - distinguishing it from R5F102-series counterparts.

It operates exclusively in HS (high-speed main) mode for peripheral timing, with no data flash memory or safety features like RAM/SFR guard. The 24-pin HWQFN package supports only 22 I/O pins (including 5 N-ch open-drain), and serial interfaces are limited to one UART and one simplified SPI (CSI), with no I²C capability.

Key Specifications

Pinout & Package

Package: HWQFN-24 (4 × 4 mm, 0.5 mm pitch), exposed die pad recommended to be connected to VSS for thermal and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10278ANA#25, the R5F10378ANA#25 trades data flash and precision timing for lower BOM cost and simpler qualification; versus R5F1037AAANA#25, it offers identical peripheral functionality at reduced memory cost - ideal for fixed-function, volume-sensitive designs.

Availability

R5F10378ANA#25 is available at Aetrix Electronics and suitable for smart thermostat interfaces, wireless sensor nodes, industrial panel controllers, and home appliance motor control requiring stable component supply across production lifecycles.

Supply support for R5F10378ANA#25 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 management ICs for automotive, industrial, and IoT markets.

The RL78/G12 product line delivers true low-power 16-bit MCUs targeting cost-sensitive, battery-operated consumer and industrial control applications - emphasizing energy efficiency, integrated peripherals, and rapid time-to-market.

FAQ

What is the maximum operating frequency of the R5F10378ANA#25?

The R5F10378ANA#25 supports a maximum system clock frequency of 24 MHz using its high-speed on-chip oscillator. When driven by an external crystal or resonator, the maximum main system clock frequency is 20 MHz (VDD ≥ 2.7 V) or 16 MHz (VDD ≥ 2.4 V). Instruction execution time ranges from 0.04167 µs (24 MHz internal) to 0.05 µs (20 MHz external), enabling deterministic real-time response in the R5F10378ANA#25.

Does the R5F10378ANA#25 include data flash memory?

No, the R5F10378ANA#25 does not include data flash memory. As confirmed in the RL78/G12 datasheet Section 1.3.1, R5F103-series devices omit the 2 KB data flash present in R5F102-series parts. This means the R5F10378ANA#25 relies solely on its 8 KB code flash for both program storage and non-volatile parameter retention - requiring software-based EEPROM emulation if persistent data storage is needed.

What are the key differences between R5F10378ANA#25 and R5F10278ANA#25?

The R5F10378ANA#25 omits data flash memory, CRC unit, RAM guard, and SFR guard found in the R5F10278ANA#25, and has ±5.0% high-speed oscillator accuracy versus ±1.0%. Both share identical 24-pin HWQFN package, 8 KB code flash, 512 B RAM, and peripheral set except for DMA (absent in both). These differences make the R5F10378ANA#25 suitable for cost-optimized, non-safety-critical applications where data logging or tight timing isn't required.

Can the R5F10378ANA#25 operate from a 1.8 V supply?

Yes, the R5F10378ANA#25 is fully specified to operate from 1.8 V to 5.5 V supply voltage across its full temperature range (–40°C to +85°C). At 1.8 V, the maximum allowed main system clock frequency is 8 MHz, and the high-speed on-chip oscillator is limited to 1–8 MHz operation. All I/O pins maintain TTL-compatible input thresholds and 6 V-tolerant capability on designated pins, enabling direct interfacing with 1.8 V logic without level shifters in the R5F10378ANA#25.

Which serial interfaces are supported by the R5F10378ANA#25?

The R5F10378ANA#25 supports one UART channel (UART0), one simplified SPI interface (CSI00), and no I²C capability - consistent with R5F103-series limitations. Unlike R5F1027x parts, it lacks simplified I²C (IIC00/IIC01) and second CSI channel. UART0 uses P11 (RxD0) and P12 (TxD0); CSI00 uses P10 (SCK00), P11 (SI00), and P12 (SO00). These interfaces are multiplexed on port pins and require configuration via the peripheral I/O redirection register (PIOR) in the R5F10378ANA#25.