Renesas R5F101LJAFB#X0

Overview

R5F101LJAFB#X0 from Renesas is a 64-pin LFQFP (10 × 10 mm, 0.5-mm pitch), 192 KB flash, 8 KB data flash, 16 KB RAM RL78/G13 16-bit microcontroller operating from 1.6 V to 5.5 V, delivering 41 DMIPS at 32 MHz, with ultra-low-power STOP mode (0.57 μA) and RTC/LVD operation - deployed in industrial sensor nodes and battery-powered HMI control units.

For engineers reviewing the R5F101LJAFB#X0 datasheet, R5F101LJAFB#X0 pinout, R5F101LJAFB#X0 application, or R5F101LJAFB#X0 equivalent, key selection criteria include its 64-pin LFQFP-0.5mm package, absence of on-chip data flash (R5F101x series), -40°C to +85°C industrial temperature grade (D suffix), and integrated 10-bit ADC with 26-channel analog input capability.

Technical Context

The R5F101LJAFB#X0 implements the RL78 CPU core with CISC architecture and 3-stage pipeline, supporting instruction execution times from 0.03125 μs (32 MHz high-speed mode) to 30.5 μs (32.768 kHz subsystem clock). It integrates a 12-bit interval timer, real-time clock with calendar/alarm functions, and watchdog timer driven by a dedicated low-speed on-chip oscillator.

Its peripheral set includes up to 16 channels of 16-bit timer, 3–10 I²C/Simplified I²C channels, 2–4 UART/LIN interfaces, 2–8 CSI (SPI-compatible) channels, and an 8/10-bit A/D converter with internal 1.45 V reference and temperature sensor - all configurable via register-based control without external timing components.

Key Specifications

Pinout & Package

Package: 64-pin LFQFP (10 × 10 mm, 0.5-mm pitch), RoHS-compliant, moisture sensitivity level (MSL) 3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F100LJAFB#X0, the R5F101LJAFB#X0 trades data flash capability for reduced BOM cost and simplified flash management, while R5F101LJAFP#X0 offers identical functionality in a larger, more manufacturable package - enabling drop-in replacement where PCB rework is acceptable.

Availability

R5F101LJAFB#X0 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat controllers, and programmable logic relays requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for R5F101LJAFB#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 is a global semiconductor leader specializing in microcontrollers, analog, and power solutions, with deep expertise in low-power embedded systems and automotive-grade reliability.

The RL78/G13 product line delivers true low-power performance (66 μA/MHz, 0.57 μA STOP) for cost-sensitive industrial, consumer, and home automation applications - balancing processing capability, peripheral richness, and energy efficiency.

FAQ

Does R5F101LJAFB#X0 include on-chip data flash memory?

No, R5F101LJAFB#X0 does not include on-chip data flash memory. As indicated by the "101" family designation in the Renesas part numbering scheme (per datasheet Section 1.2), the R5F101x series omits data flash entirely - unlike the R5F100x series which provides 4–8 KB. Firmware must use code flash sectors with wear-leveling techniques for parameter storage.

What is the maximum operating frequency and corresponding DMIPS rating for R5F101LJAFB#X0?

R5F101LJAFB#X0 operates at up to 32 MHz using the high-speed on-chip oscillator, achieving 41 DMIPS (Dhrystone MIPS) performance. This figure is measured under standard conditions (VDD = 2.7–5.5 V, TA = 25°C) and reflects the RL78 core's optimized 3-stage pipeline execution efficiency.

Which package type and pitch does R5F101LJAFB#X0 use?

R5F101LJAFB#X0 uses the LFQFP package (Low-profile Quad Flat Package) with 64 pins, 10 mm × 10 mm body size, and 0.5 mm lead pitch. The "FB" suffix in the part number explicitly denotes this variant per Renesas' packaging nomenclature in Section 1.2 of the datasheet.

Is R5F101LJAFB#X0 qualified for industrial temperature range?

Yes, R5F101LJAFB#X0 is rated for -40°C to +85°C operation. The "D" in the full ordering code (R5F101LJAFB#X0 corresponds to R5F101LJADFB per Table 1-1) confirms its industrial-grade qualification - distinct from "A" (consumer) and "G" (+105°C) variants.

How many analog input channels does the integrated ADC support on R5F101LJAFB#X0?

The R5F101LJAFB#X0 integrates a 10-bit A/D converter supporting up to 26 analog input channels, as confirmed in the "A/D converter" feature list (Section 1.1) and validated across all 64-pin RL78/G13 variants in the device matrix (Page 2). Channel mapping is fixed per pin assignment (e.g., P20–P27, P30–P37).