Renesas R5F21257SNFP#V2

Overview

R5F21257SNFP#V2 from Renesas Electronics is a 16-bit R8C/Tiny Series single-chip microcontroller with 48 KB flash program memory, 2.5 KB RAM, and dual 1 KB data flash blocks. It features a 10-bit 12-channel ADC, two UARTs, I²C, LIN hardware module, four 16/8-bit timers (including RTC), and operates from 2.2–5.5 V across –20°C to +85°C. It targets embedded control in consumer appliance motor drives and sensor-based UI subsystems.

For engineers reviewing the R5F21257SNFP#V2 datasheet, R5F21257SNFP#V2 pinout, R5F21257SNFP#V2 application, or R5F21257SNFP#V2 equivalent, key selection criteria include its 52-pin LQFP package, on-chip data flash endurance (10,000 write/erase cycles), real-time clock timer RE, LIN protocol support via UART0+timer RA, and low-power stop mode current (0.7 µA at 3.0 V).

Technical Context

The R5F21257SNFP#V2 implements the R8C/Tiny CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN, 3.0–5.5 V). Its memory architecture separates 48 KB flash program ROM from two independent 1 KB data flash blocks-enabling nonvolatile parameter storage without erasing application code.

Peripheral integration includes Timer RD (16-bit × 2 channels with input capture/output compare), Timer RE (real-time clock with compare match), hardware LIN transceiver (using UART0 and timer RA), and dual UARTs supporting asynchronous and clock-synchronous serial I/O. The device uses three clock sources: XIN (external crystal/resonator), high-speed on-chip oscillator (adjustable), and XCIN (32 kHz for RTC).

Key Specifications

Pinout & Package

Package: 52-pin molded-plastic LQFP (PLQP0052JA-A), 10 mm × 10 mm body, 0.65 mm pin pitch, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21257SNFP#V2, R5F21256SNFP offers reduced program memory (32 KB vs. 48 KB) for cost-sensitive designs, while R5F21257SDFP extends temperature range to –40°C without altering functionality-making it suitable for harsher environments without firmware or layout revision.

Availability

R5F21257SNFP#V2 is available at Aetrix Electronics and suitable for home appliance motor control, smart thermostat sensor hubs, industrial panel UI controllers, and consumer audio remote interfaces requiring stable component supply and long-term production continuity.

Supply support for R5F21257SNFP#V2 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 specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and IoT applications.

The R8C/25 Group-including R5F21257SNFP#V2-is designed for cost-effective, low-power embedded control in consumer electronics and industrial equipment, emphasizing integrated peripherals, data flash reliability, and wide-voltage operation.

FAQ

What is the maximum operating frequency of the R5F21257SNFP#V2?

The R5F21257SNFP#V2 supports a maximum external crystal frequency of 20 MHz on the XIN pin, achieving a minimum instruction execution time of 50 ns under 3.0–5.5 V supply conditions. Its high-speed on-chip oscillator is adjustable but does not exceed this frequency. The device is not rated for overclocking beyond 20 MHz.

Does the R5F21257SNFP#V2 include hardware support for LIN communication?

Yes, the R5F21257SNFP#V2 integrates a hardware LIN module that combines UART0 and timer RA to implement LIN 2.0/2.1 protocol handling-including break detection, sync field processing, and checksum generation-without CPU intervention during frame transmission and reception.

How many write/erase cycles are guaranteed for the data flash in the R5F21257SNFP#V2?

The R5F21257SNFP#V2 specifies 10,000 write/erase cycles for each of its two 1 KB data flash blocks. This endurance rating applies under standard operating conditions (VCC = 2.7–5.5 V, ambient temperature within –20°C to +85°C) and is validated per Renesas' product specifications.

What package type and pin count does the R5F21257SNFP#V2 use?

The R5F21257SNFP#V2 is packaged in a 52-pin LQFP (PLQP0052JA-A) with 10 mm × 10 mm body size and 0.65 mm pin pitch. This RoHS-compliant package supports reflow soldering and is compatible with standard surface-mount assembly processes used in high-volume manufacturing.

Can the R5F21257SNFP#V2 operate from a 3.3 V supply?

Yes, the R5F21257SNFP#V2 operates across a supply range of 2.2 V to 5.5 V. At 3.3 V, it supports up to 10 MHz operation (100 ns min. instruction time) and achieves typical active current consumption of 6 mA-making it suitable for mixed-voltage 3.3 V system designs with peripheral ICs.