Renesas R5F103A8ASP#50

Overview

R5F103A8ASP#50 from Renesas Electronics is a 30-pin LSSOP-packaged RL78/G12 16-bit microcontroller designed for ultra-low-power general-purpose embedded control. It features 4 KB code flash, 512 B RAM, 8-channel 8/10-bit A/D converter, 1-channel UART, and operates from 1.8 V to 5.5 V across –40°C to +85°C ambient temperature - deployed in battery-powered sensor nodes and industrial HMI front-ends.

For engineers reviewing the R5F103A8ASP#50 datasheet, R5F103A8ASP#50 pinout, R5F103A8ASP#50 application, or R5F103A8ASP#50 equivalent, key selection criteria include its absence of data flash memory, single UART channel, lack of DMA and safety functions (CRC/RAM guard), and 30-pin LSSOP package with 26 I/Os - critical for cost-sensitive, low-complexity control designs requiring long battery life and wide supply voltage tolerance.

Technical Context

The R5F103A8ASP#50 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting minimum instruction execution time of 0.04167 µs at 24 MHz via high-speed on-chip oscillator (±5% accuracy over –40°C to +85°C). Its clock system integrates selectable high-speed (1–24 MHz) and low-speed (15 kHz) on-chip oscillators, plus external crystal support (X1/X2) up to 20 MHz.

Peripheral integration includes TAU timer array (8 channels), 12-bit interval timer, window watchdog timer, programmable clock/buzzer output (PCLBUZ0/PCLBUZ1), and simplified SPI (CSI00) - all configured via peripheral I/O redirection register (PIOR) for flexible pin assignment. No DMA, no data flash, and no I²C interface distinguish it from R5F102A-series counterparts.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant, moisture sensitivity level MSL3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F103A8ASP#50, R5F102AAASP#50 adds safety and data logging capabilities at higher cost and power, while R5F103AAASP#50 scales flash/RAM capacity within identical power, timing, and interface constraints - making both viable alternatives depending on firmware size and functional safety requirements.

Availability

R5F103A8ASP#50 is available at Aetrix Electronics and suitable for smart home sensor nodes, industrial panel controllers, portable medical monitors, and white goods motor control systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for R5F103A8ASP#50 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, delivering 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 - emphasizing energy efficiency, integrated analog peripherals, and simplified development for consumer and industrial equipment.

FAQ

What is the maximum operating frequency of the R5F103A8ASP#50?

The R5F103A8ASP#50 supports a maximum system clock frequency of 24 MHz using its high-speed on-chip oscillator. When using an external crystal (X1/X2), the maximum frequency is 20 MHz. The CPU executes instructions at 0.04167 µs minimum cycle time under 24 MHz operation, enabling responsive real-time control in the R5F103A8ASP#50.

Does the R5F103A8ASP#50 include data flash memory?

No, the R5F103A8ASP#50 does not include data flash memory. This distinguishes it from the R5F102x series, which integrates 2 KB of data flash. The R5F103A8ASP#50 relies solely on its 4 KB code flash for program storage and uses RAM for runtime variables - a design choice that reduces cost and power while limiting non-volatile parameter storage capability in the R5F103A8ASP#50.

What serial communication interfaces are supported by the R5F103A8ASP#50?

The R5F103A8ASP#50 supports one UART channel (RxD0/TxD0), one simplified SPI (CSI00) channel, and no I²C interface. Unlike R5F102A-series variants, it omits simplified I²C (IIC00) and second UART channels. All serial functions are assigned to dedicated pins (P10–P12) and configurable via the peripheral I/O redirection register (PIOR) in the R5F103A8ASP#50.

What is the operating temperature range for the R5F103A8ASP#50?

The R5F103A8ASP#50 is rated for operation from –40°C to +85°C, designated for consumer and industrial applications (suffix 'A'). It does not support the extended –40°C to +105°C range (suffix 'G') offered by some RL78/G12 variants. This temperature grade ensures reliable performance in indoor equipment, portable devices, and factory-floor control panels where ambient extremes are bounded, as specified for the R5F103A8ASP#50.

How many I/O pins does the R5F103A8ASP#50 provide, and what types are available?

The R5F103A8ASP#50 provides 26 I/O pins in its 30-pin LSSOP package. These include 9 N-ch open-drain I/Os (VDD-tolerant), 4 CMOS inputs, and configurable pull-up resistors. It supports mixed-voltage interfacing down to 1.8 V logic levels, enabling direct connection to 1.8 V, 2.5 V, or 3.3 V peripherals without level shifters - a key flexibility feature of the R5F103A8ASP#50.