Renesas R5F103AAASP#X0

Overview

R5F103AAASP#X0 from Renesas Electronics is a 30-pin LSSOP ultra-low-power 16-bit RL78/G12 microcontroller designed for cost-sensitive consumer applications. It features 16 KB code flash, 256 B RAM, 1.8–5.5 V operation, 8-channel 10-bit ADC, and a 24 MHz high-speed on-chip oscillator with ±5.0% accuracy over –40 to +85°C - enabling battery-powered sensor nodes and smart home peripherals.

For engineers reviewing the R5F103AAASP#X0 datasheet, R5F103AAASP#X0 pinout, R5F103AAASP#X0 application, or R5F103AAASP#X0 equivalent, key selection criteria include its absence of data flash memory, single UART channel, no DMA or safety functions (CRC/SFR guard), and fixed 30-pin LSSOP-30 package with REGC regulator capacitor pin - all critical for BOM validation and low-power firmware architecture planning.

Technical Context

The R5F103AAASP#X0 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). It operates in HS/LS clock modes using either external crystal (1–20 MHz) or internal oscillator (1–24 MHz), with dedicated 15 kHz low-speed on-chip oscillator for watchdog timing.

Peripheral integration includes TAU timer array (8 channels), SAU0 serial interface (1 CSI, 1 I2C, 1 UART), 8-channel 10-bit A/D converter with internal reference, and programmable clock/buzzer output (PCLBUZ0/PCLBUZ1). No DMA, no data flash, and no simplified I2C support distinguish it from R5F102A-series variants.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm, 0.65-mm pitch), JEDEC MO-153 compliant, thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F103AAASP#X0, R5F102AAASP#X0 adds data flash and safety features at higher cost and power, while R5F103A9ASP#X0 trades flash capacity and RAM for lower unit price - making R5F103AAASP#X0 optimal for new designs needing maximum code space in consumer-grade reliability.

Availability

R5F103AAASP#X0 is available at Aetrix Electronics and suitable for smart home sensors, wireless transmitters, USB-C monitors, and industrial indicators requiring stable component supply across extended production lifecycles.

Supply support for R5F103AAASP#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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for automotive, industrial, and IoT markets.

The RL78/G12 product line delivers ultra-low-power 16-bit MCUs targeting cost-sensitive consumer and industrial control applications where energy efficiency, integrated peripherals, and long-term supply stability are essential.

FAQ

What is the maximum operating frequency and oscillator accuracy of the R5F103AAASP#X0?

The R5F103AAASP#X0 supports up to 24 MHz operation using its high-speed on-chip oscillator, with ±5.0% frequency accuracy over the full –40 to +85°C temperature range and 1.8–5.5 V supply. This accuracy is sufficient for UART communication at standard baud rates but not for precision timing or RTC applications. External crystal oscillators up to 20 MHz are also supported via X1/X2 pins.

Does the R5F103AAASP#X0 include data flash memory?

No, the R5F103AAASP#X0 does not include data flash memory. Unlike the R5F102A-series, this variant omits the 2 KB data flash block entirely. Firmware must use code flash for parameter storage (with wear-leveling) or rely on external EEPROM/FRAM. This omission reduces cost and die size while maintaining identical code flash capacity (16 KB).

What are the key differences between R5F103AAASP#X0 and R5F102AAASP#X0?

The R5F103AAASP#X0 lacks data flash memory, DMA controller, CRC calculation unit, SFR guard, and RAM guard features present in the R5F102AAASP#X0. Its high-speed oscillator accuracy is ±5.0% versus ±1.0% on the R5F102 variant. Both share identical 16 KB code flash, 30-pin LSSOP package, and peripheral count - making R5F103AAASP#X0 ideal for non-safety, non-field-upgradable designs.

How is the REGC pin used on the R5F103AAASP#X0?

The REGC pin on the R5F103AAASP#X0 must be connected to VSS through a 0.47–1 µF ceramic capacitor to stabilize the internal voltage regulator. Failure to populate this capacitor will cause erratic reset behavior, ADC inaccuracies, and potential failure to exit STOP mode. This is a mandatory design requirement - not optional - and applies only to 30-pin RL78/G12 variants.

Which serial interfaces are available on the R5F103AAASP#X0?

The R5F103AAASP#X0 provides one UART channel (RxD0/TxD0), one simplified SPI (CSI00), and one simplified I2C (IIC00) channel - all multiplexed across shared pins (e.g., P10–P12). It does not support simplified I2C on additional channels or second UART. The SAU0 peripheral enables flexible configuration, but hardware resources are limited to these three serial protocols simultaneously.