Renesas R5F101SJAFB#V0

Overview

R5F101SJAFB#V0 from Renesas is a 128-pin LFQFP-0.5mm, 32-bit RL78/G13 microcontroller with 128 KB flash, 12 KB RAM, and no data flash memory, operating from 1.6 V to 5.5 V across -40°C to +85°C industrial temperature range. It delivers 41 DMIPS at 32 MHz, features ultra-low-power HALT/STOP/SNOOZE modes (0.57 μA RTC+LVD), and integrates 16-bit timers, 10-bit ADC (26 channels), UART/LIN, I²C, CSI, RTC, and on-chip debug.

For engineers reviewing the R5F101SJAFB#V0 datasheet, R5F101SJAFB#V0 pinout, R5F101SJAFB#V0 application, or R5F101SJAFB#V0 equivalent, this page provides verified technical context, package mapping, real-world use cases, and validated alternative options for industrial control, sensor nodes, and battery-powered embedded systems requiring deterministic low-power operation and mixed-signal integration.

Technical Context

The R5F101SJAFB#V0 implements the RL78 CPU core-a CISC architecture with 3-stage pipeline-supporting instruction execution times from 0.03125 μs (32 MHz high-speed oscillator) to 30.5 μs (32.768 kHz subsystem clock). Its memory map spans 1 MB address space, with dedicated SFRs and banked 8-bit general-purpose registers enabling efficient peripheral control and interrupt handling.

Power management includes an on-chip POR circuit, 14-level LVD with selectable reset/interrupt, and multiple low-power modes coordinated by the system controller. Peripheral integration is managed via independent clock domains: main, subsystem, and peripheral clocks, allowing selective gating and dynamic frequency scaling without compromising RTC or LVD functionality.

Key Specifications

Pinout & Package

Package: 128-pin LFQFP (14 × 20 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level (MSL) 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F101SJAFB#V0, R5F101SLAFB#V0 adds persistent data storage capability without layout changes, while R5F100SJAFB#V0 trades off data flash for wider temperature tolerance-making each variant optimal for distinct reliability and data retention requirements.

Availability

R5F101SJAFB#V0 is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, wireless sensor nodes, and building automation controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for R5F101SJAFB#V0 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 is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and enterprise markets.

The RL78/G13 family targets cost-sensitive, ultra-low-power embedded applications requiring high integration, robust real-time performance, and simplified development-especially in industrial control, home appliances, and sensor-edge systems.

FAQ

What is the maximum clock frequency supported by the R5F101SJAFB#V0?

The R5F101SJAFB#V0 supports a maximum operating frequency of 32 MHz using its high-speed on-chip oscillator. At this speed, it achieves 41 DMIPS performance. The oscillator accuracy is ±1.0% over -20°C to +85°C, eliminating the need for an external crystal in many applications. The R5F101SJAFB#V0 also supports lower-frequency clock sources including a 32.768 kHz crystal for RTC operation.

Does the R5F101SJAFB#V0 include data flash memory?

No, the R5F101SJAFB#V0 does not include data flash memory. Per Renesas part numbering conventions, the "101" prefix indicates no data flash, whereas "100" variants (e.g., R5F100SJAFB#V0) include 8 KB. This makes the R5F101SJAFB#V0 ideal for applications where code-only storage is sufficient and cost optimization is critical, with external EEPROM or FRAM used if non-volatile parameter storage is required.

What package type and pin count does the R5F101SJAFB#V0 use?

The R5F101SJAFB#V0 uses a 128-pin LFQFP package with 0.5 mm pitch, measuring 14 mm × 20 mm. The "FB" suffix in the part number explicitly denotes LFQFP, and "#V0" indicates tray packaging. This package provides full I/O access-including 102 user-programmable ports-and is compatible with standard surface-mount assembly processes and IPC Class 2/3 reflow profiles.

What low-power modes are available on the R5F101SJAFB#V0?

The R5F101SJAFB#V0 supports HALT, STOP, and SNOOZE modes. In STOP mode with only RTC and LVD active, current consumption drops to 0.57 μA - enabling multi-year battery life in sensor endpoints. HALT mode draws 66 μA/MHz, and SNOOZE allows selected peripherals (e.g., UART, ADC) to operate while CPU remains halted. All modes retain RAM content and support wake-up via interrupts or reset conditions.

Is the R5F101SJAFB#V0 pin-compatible with other RL78/G13 variants?

Yes, the R5F101SJAFB#V0 is pin-compatible with all other 128-pin RL78/G13 variants in the same LFQFP package (e.g., R5F100SJAFB#V0, R5F101SLAFB#V0). Pin functions, power domains, and peripheral mappings are consistent across the family. This enables design reuse and migration paths - for example, upgrading to data flash or extended temperature grade without PCB revision.