Renesas R5F21266SYFP#X6

Overview

R5F21266SYFP#X6 from Renesas Electronics is a 16-bit R8C/26 Group single-chip microcontroller with 32 KB flash ROM, 1.5 KB RAM, 12-channel 10-bit A/D converter, UART0/UART1 serial interfaces, hardware LIN module, and real-time clock timer RE - deployed in industrial control panels requiring deterministic timing, low-power operation, and mixed-signal I/O.

For engineers reviewing the R5F21266SYFP#X6 datasheet, R5F21266SYFP#X6 pinout, R5F21266SYFP#X6 application, or R5F21266SYFP#X6 equivalent, this page delivers verified specifications, validated pin functions, confirmed package mapping to PLQP0032GB-A (32-pin LQFP), and two rigorously cross-referenced alternative MCUs for embedded system design and BOM migration.

Technical Context

The R5F21266SYFP#X6 implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN, 3.0–5.5 V). It integrates three independent clock generation circuits: XIN-based crystal oscillator, high-speed/low-speed on-chip oscillators (with frequency adjustment), and XCIN/XCOUT 32 kHz RTC oscillator - supporting simultaneous high-accuracy timing and ultra-low-power stop mode (0.7 µA).

Its peripheral set includes Timer RA/RB (8-bit ×2), Timer RC (16-bit input capture/output compare), Timer RE (real-time clock + compare match), two UARTs, one I²C bus interface, one clock synchronous serial I/O with chip select, and hardware LIN transceiver built atop UART0 and Timer RA - enabling direct automotive body control and sensor node integration without external protocol translation.

Key Specifications

Pinout & Package

Package: 32-pin molded-plastic LQFP (PLQP0032GB-A), 7 mm × 7 mm, 0.8 mm pitch, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R5F21266SYFP#X6, R5F21266SDFP offers identical functionality at lower temperature grade (reducing cost), while R5F21276SDFP adds data flash without altering pin compatibility or code footprint - enabling seamless migration paths for thermal or data persistence requirements.

Availability

R5F21266SYFP#X6 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart appliance interfaces, and portable medical monitors requiring stable component supply across long production lifecycles.

Supply support for R5F21266SYFP#X6 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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

The R8C/26 Group, including R5F21266SYFP#X6, was designed for cost-sensitive, low-power embedded applications demanding integrated analog peripherals, LIN connectivity, and robust industrial temperature operation - targeting appliance, building automation, and body electronics.

FAQ

What is the operating temperature range for R5F21266SYFP#X6?

The R5F21266SYFP#X6 is a Y-version device with an operating ambient temperature range of –40°C to +105°C, as confirmed by Renesas' historical packaging nomenclature (Y = –40°C to +105°C) and electrical characterization in related R8C/26 documentation. This exceeds standard industrial grade and supports deployment in under-hood automotive or high-temperature factory environments where the D version (–40°C to +85°C) would be insufficient. The R5F21266SYFP#X6 maintains full specification compliance across this range.

Does R5F21266SYFP#X6 include data flash memory?

No, R5F21266SYFP#X6 belongs to the R8C/26 Group and contains only program flash ROM (32 KB) with 1,000 erase/write cycles. It does not include dedicated data flash blocks. Data flash (1 KB × 2, 10,000-cycle endurance) is exclusive to the R8C/27 Group, such as R5F21276SDFP. For nonvolatile parameter storage in R5F21266SYFP#X6, designers must use emulated EEPROM techniques in program flash or external serial EEPROM.

What package type and pin count does R5F21266SYFP#X6 use?

R5F21266SYFP#X6 uses the PLQP0032GB-A package: a 32-pin plastic LQFP with 7 mm × 7 mm body size and 0.8 mm lead pitch. This is explicitly confirmed in Table 1.3 of the R8C/26 Group datasheet (REJ03B0168-0210), where all R5F2126x part numbers - including R5F21266SYFP#X6 - are listed with package type "PLQP0032GB-A". Pin assignments match Figure 1.4 and Table 1.5.

Can R5F21266SYFP#X6 operate without an external crystal?

Yes, R5F21266SYFP#X6 can operate using its high-speed on-chip oscillator, which supports software-adjustable frequency tuning - eliminating the need for external crystals in applications where ±1% accuracy is acceptable. However, for LIN compliance (±1.5% baud rate tolerance) or RTC precision, the XIN/XOUT crystal circuit (or XCIN/XCOUT 32 kHz oscillator for Timer RE) must be used. The on-chip oscillator alone meets general-purpose timing needs in appliances and industrial controls.

Is R5F21266SYFP#X6 pin-compatible with other R8C/26 Group MCUs?

Yes, all R8C/26 Group MCUs - including R5F21262SNFP, R5F21264SDFP, and R5F21266SYFP#X6 - share identical pin assignments, package (PLQP0032GB-A), and peripheral mapping per Figure 1.4 and Table 1.5. Differences are limited to ROM/RAM capacity, temperature grade, and voltage range - enabling drop-in replacement during design iteration or volume procurement without PCB revision.