Renesas R5F103A8ASP#X0

Overview

R5F103A8ASP#X0 from Renesas Electronics is a 30-pin LSSOP-packaged RL78/G12 16-bit MCU 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 8-channel ADC, 8-channel 16-bit TAU timer, and single UART with true low-power operation at 63 μA/MHz. It serves as the main controller in battery-powered home appliances and sensor nodes.

For engineers reviewing the R5F103A8ASP#X0 datasheet, R5F103A8ASP#X0 pinout, R5F103A8ASP#X0 application, or R5F103A8ASP#X0 equivalent, key selection criteria include its 30-pin LSSOP package, absence of data flash memory, limited serial interface set (1 UART, 1 CSI), and lack of DMA or safety features-distinguishing it from R5F102A-series variants.

Technical Context

The R5F103A8ASP#X0 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting 1 MB address space and 8-bit register banks. Its clock system combines a high-speed on-chip oscillator (1–24 MHz, ±5% accuracy over –40°C to +85°C) and external crystal support (1–20 MHz).

It delivers 31 DMIPS at 24 MHz while maintaining ultra-low power modes: HALT (0.52 μA), STOP (0.23 μA), and SNOOZE. Peripheral integration includes programmable clock/buzzer output, on-chip voltage detector (12-level LVD), and power-on-reset circuit-optimized for cost-sensitive, energy-constrained designs without data logging or safety-critical functions.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm, 0.65-mm pitch), RoHS-compliant, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F103A8ASP#X0, R5F102A8ASP#X0 adds data flash and safety features at higher cost and power, while R5F103AAASP#X0 trades flash density for identical peripheral functionality-making both viable alternatives depending on firmware size and update requirements.

Availability

R5F103A8ASP#X0 is available at Aetrix Electronics and suitable for smart home sensors, portable medical monitors, white goods control panels, and industrial remote I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for R5F103A8ASP#X0 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-optimized, ultra-low-power general-purpose embedded control-emphasizing energy efficiency, integrated peripherals, and rapid time-to-market for consumer and industrial applications.

FAQ

What is the maximum operating frequency and instruction throughput of the R5F103A8ASP#X0?

The R5F103A8ASP#X0 achieves a maximum system clock of 24 MHz using its high-speed on-chip oscillator, delivering 31 DMIPS performance. Minimum instruction execution time is 0.04167 μs at 24 MHz, confirmed in the RL78/G12 datasheet Rev.2.50. This throughput supports real-time control loops and moderate algorithmic processing without external acceleration.

Does the R5F103A8ASP#X0 include data flash memory?

No, the R5F103A8ASP#X0 does not include data flash memory. As confirmed in Section 1.3.1 of the RL78/G12 datasheet, 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 logging is required.

What serial communication interfaces are available on the R5F103A8ASP#X0?

The R5F103A8ASP#X0 provides one UART channel, one simplified SPI (CSI) channel, and no simplified I²C or full I²C interface. This configuration is documented in Table 1-1 and Section 1.7 of the RL78/G12 datasheet. The absence of I²C limits direct connectivity to common I²C sensors unless bit-banged via GPIO.

What is the pin count and package type of the R5F103A8ASP#X0?

The R5F103A8ASP#X0 uses a 30-pin plastic LSSOP package (7.62 mm body width, 0.65-mm lead pitch), identified by the "SP" suffix and "#X0" embossed tape packaging code. This package is RoHS-compliant and compatible with standard surface-mount assembly processes, as specified in Figure 1-1 and Table 1-1 of the RL78/G12 datasheet.

How does the R5F103A8ASP#X0 handle power supply regulation and decoupling?

The R5F103A8ASP#X0 integrates an internal voltage regulator requiring the REGC pin to be connected to VSS via a 0.47–1 μF ceramic capacitor, as mandated in Section 1.4.3 and Caution notes of the datasheet. Two dedicated VDD/VSS pairs must each be decoupled with ≥0.1 μF capacitors placed near the pins to ensure stable operation across 1.8–5.5 V supply range.