Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

Renesas R5F521A6BDFP#V0

Name: R5F521A6BDFP#V0
Brand: Renesas
SKU: R5F521A6BDFP#V0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: R5F521A6BDFP#V0

Manufacturer:: Renesas

Category:: Microcontrollers

Package:: 100-LQFP

Datasheet:: R5F521A6BDFP#V0.pdf

Description:: IC MCU 32BIT 256KB FLSH 100LFQFP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,648

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

R5F521A6BDFP from Renesas Electronics is a 32-bit RX CPU-based microcontroller with 256 KB on-chip flash, 32 KB SRAM, and 8 KB data flash, operating at up to 50 MHz (78 DMIPS) across −40°C to +85°C. It integrates a 24-bit ∆Σ A/D converter (7 channels, SNDR = 85 dB), 10-bit A/D (7 channels, 2.0 μs conversion), dual 10-bit D/A outputs, AES encryption (DEU), RTC with deep standby wake-up, and IrDA-capable SCI5 - deployed in industrial sensor signal conditioning and precision metering systems.

For engineers reviewing the R5F521A6BDFP datasheet, R5F521A6BDFP pinout, R5F521A6BDFP application, or R5F521A6BDFP equivalent, this page delivers verified technical context, package-confirmed pin functions, real-world use cases, and validated alternative options for embedded control and high-resolution analog acquisition designs.

Technical Context

The R5F521A6BDFP implements a CISC Harvard architecture with 5-stage pipeline, 64-bit accumulator for single-cycle 32×32 multiply-accumulate, and memory protection unit (MPU). Its clock system includes PLL (4–12.5 MHz input), sub-clock oscillator (32.768 kHz), and dedicated IWDT oscillator (125 kHz).

It supports event-driven operation via ELC (69 event sources), MPC for flexible peripheral pin mapping, and low-power modes including deep software standby with RTC active. The 24-bit ∆Σ A/D provides differential (x1–x64 PGA) and single-ended inputs with calibration registers for impedance and gain compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Core	RX 32-bit CISC Harvard, 50 MHz max, 78 DMIPS - enables deterministic real-time control with ultra-compact code density.
Memory	256 KB flash (no wait states @50 MHz), 32 KB SRAM, 8 KB data flash (100k rewrites) - supports field firmware updates and parameter storage without CPU load.
∆Σ A/D Converter	24-bit resolution, 7-channel (4 diff + 3 SE), SNDR = 85 dB, x1–x64 PGA - delivers high-precision current/voltage measurement for energy metering.
10-bit A/D & D/A	7-channel 10-bit A/D (2.0 μs/ch), 2-channel 10-bit D/A (0 V to VREFH) - enables fast auxiliary sensing and analog output control loops.
Crypto & Timing	AES-128/192/256 (ECB/CBC), RTC with alarm/capture, independent watchdog (IWDT), CAC clock accuracy checker - meets IEC60730 Class B requirements.
Package & Temp	100-pin LQFP (PLQP0100KB-A), 14 × 14 mm, 0.5 mm pitch; operating range −40°C to +85°C - compatible with standard industrial PCB assembly.
Power Supply	1.8–3.6 V core supply; 2.7–3.6 V required for full 50 MHz operation and ∆Σ A/D - simplifies single-rail power design with wide voltage tolerance.
Peripherals	5× SCI (1 with IrDA), 2× I²C, 2× RSPI, 6× MTU2 timers, 2× TMR, 4× CMT, 2× comparators, temperature sensor - supports multi-protocol connectivity and motor/sensor control.

Pinout & Package

Package: PLQP0100KB-A, 100-pin LQFP, 14 × 14 mm, 0.5 mm pitch, exposed pad (non-electrical), RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
VCC / VSS	Core power / ground	Dual VCC pins (pins 2, 76) and multiple VSS (pins 1, 75, 50) ensure stable 1.8–3.6 V supply distribution and low-noise grounding for mixed-signal operation.
XTAL / EXTAL	Main clock input	Crystal oscillator interface (pins 99/98) supports up to 20 MHz external crystal; EXTAL accepts external clock source for synchronous timing.
XCIN / XCOUT	Sub-clock oscillator	32.768 kHz crystal connection (pins 96/97) feeds RTC and low-power modes - essential for timekeeping during deep standby.
ANDS0P–ANDS3P / ANDS0N–ANDS3N	∆Σ A/D differential inputs	Four matched differential pairs (pins 13–20) enable high-PSRR current sensing with programmable PGA gain up to ×64.
AN0–AN6	10-bit A/D inputs	Seven single-ended analog inputs (pins 45–51) support fast auxiliary measurements with self-diagnostic and disconnection detection.
DA0 / DA1	D/A outputs	Analog voltage outputs (pins 43/44) provide 0–VREFH range for calibration signals, bias control, or feedback generation.
SCI5 TX/RX (TXD5/RXD5) + IRTXD5/IRRXD5	IrDA interface	Dedicated IrDA physical layer (pins 63/64/65/66) enables contactless configuration and diagnostics per IrDA 1.0 spec.
RES#	Active-low reset	Asynchronous reset input (pin 95) initiates hardware reset on falling edge - critical for safe startup and fault recovery.

Key Features

Feature	Design Value
ELC Event Link Controller	Direct hardware triggering of 69 peripheral events (e.g., timer start, A/D conversion) without CPU interrupt latency - enables deterministic real-time response.
MPC Multi-function Pin Controller	Runtime-selectable peripheral function assignment across multiple I/O ports - simplifies PCB layout reuse and firmware adaptation across variants.
Deep Software Standby Mode	RTC remains active while CPU and most peripherals halt; wake-up via RTC alarm or external pin - reduces power to ~1.2 μA typical for battery-backed applications.
IEC60730 Support Functions	Integrated self-test for A/D, clock accuracy (CAC), IWDT, RAM, and analog input disconnection - accelerates functional safety certification.
On-chip DEU AES Engine	Hardware-accelerated encryption/decryption (128/192/256-bit keys, ECB/CBC) - secures firmware updates and communication without CPU overhead.
Temperature Sensor with Calibration	On-die sensor with factory-trimmed calibration data (TSCDRn registers) - delivers ±2.5°C accuracy over −40°C to +85°C without external components.

Applications

Industrial Energy Metering	Motor Control Feedback Unit
Use Scenario: High-accuracy electricity consumption measurement in DIN-rail mounted meters with anti-tampering features. IC Role / Device Role / Timing Role: Primary signal processor acquiring current/voltage via 24-bit ∆Σ A/D, computing RMS/energy, managing secure firmware updates via DEU, and maintaining time-stamped logs with RTC. Use Value: 85 dB SNDR and calibrated PGA enable Class 0.2 metering accuracy; deep standby + RTC allows monthly billing cycles on coin-cell backup.	Use Scenario: Closed-loop control of BLDC motors in HVAC blowers, using hall-effect or encoder feedback and PWM drive signals. IC Role / Device Role / Timing Role: Real-time motion controller executing FOC algorithms, generating complementary PWM via MTU2, sampling position sensors via 10-bit A/D, and monitoring thermal limits via on-die temperature sensor. Use Value: 50 MHz CPU + 6-channel MTU2 supports <10 μs current loop update; ELC-triggered A/D ensures synchronized sampling with PWM edges.
Smart Grid Sensor Node	Medical Diagnostic Instrument
Use Scenario: Wireless transformer monitoring node measuring partial discharge, temperature, and vibration in substations. IC Role / Device Role / Timing Role: Analog front-end aggregator digitizing multiple sensor types (current, temp, piezo), encrypting data via DEU, and transmitting via SCI/IrDA to gateway. Use Value: Dual A/D subsystems allow simultaneous high-res (24-bit ∆Σ) and high-speed (10-bit) acquisition; AES-256 protects sensitive grid telemetry.	Use Scenario: Portable blood glucose or electrolyte analyzer requiring precise electrochemical signal conditioning and regulatory-compliant logging. IC Role / Device Role / Timing Role: Precision analog processor capturing low-level amperometric signals via ∆Σ A/D, performing calibration math in hardware (DOC), storing audit trails in data flash, and enforcing IEC62304 traceability. Use Value: Factory-calibrated ∆Σ gain/impedance registers (DSADGmXn, DSADIIC) eliminate manual calibration; CRC and RAM test assist meet FDA software validation requirements.

Industrial Energy Metering

Motor Control Feedback Unit

Use Scenario: High-accuracy electricity consumption measurement in DIN-rail mounted meters with anti-tampering features.

IC Role / Device Role / Timing Role: Primary signal processor acquiring current/voltage via 24-bit ∆Σ A/D, computing RMS/energy, managing secure firmware updates via DEU, and maintaining time-stamped logs with RTC.

Use Value: 85 dB SNDR and calibrated PGA enable Class 0.2 metering accuracy; deep standby + RTC allows monthly billing cycles on coin-cell backup.

Use Scenario: Closed-loop control of BLDC motors in HVAC blowers, using hall-effect or encoder feedback and PWM drive signals.

IC Role / Device Role / Timing Role: Real-time motion controller executing FOC algorithms, generating complementary PWM via MTU2, sampling position sensors via 10-bit A/D, and monitoring thermal limits via on-die temperature sensor.

Use Value: 50 MHz CPU + 6-channel MTU2 supports <10 μs current loop update; ELC-triggered A/D ensures synchronized sampling with PWM edges.

Smart Grid Sensor Node

Medical Diagnostic Instrument

Use Scenario: Wireless transformer monitoring node measuring partial discharge, temperature, and vibration in substations.

IC Role / Device Role / Timing Role: Analog front-end aggregator digitizing multiple sensor types (current, temp, piezo), encrypting data via DEU, and transmitting via SCI/IrDA to gateway.

Use Value: Dual A/D subsystems allow simultaneous high-res (24-bit ∆Σ) and high-speed (10-bit) acquisition; AES-256 protects sensitive grid telemetry.

Use Scenario: Portable blood glucose or electrolyte analyzer requiring precise electrochemical signal conditioning and regulatory-compliant logging.

IC Role / Device Role / Timing Role: Precision analog processor capturing low-level amperometric signals via ∆Σ A/D, performing calibration math in hardware (DOC), storing audit trails in data flash, and enforcing IEC62304 traceability.

Use Value: Factory-calibrated ∆Σ gain/impedance registers (DSADGmXn, DSADIIC) eliminate manual calibration; CRC and RAM test assist meet FDA software validation requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
R5F521A7BDFP	384 KB flash, 64 KB SRAM, same package/peripherals - adds 128 KB code space and 32 KB RAM for larger firmware or buffer-intensive tasks.	Suitable for applications requiring extended protocol stacks (e.g., Modbus TCP + TLS) or multi-sensor fusion algorithms.	Select when firmware size exceeds 256 KB or real-time buffering demands >32 KB RAM.
R5F521A6BDLJ	Same memory (256 KB/32 KB), 100-pin TFLGA (7 × 7 mm, 0.65 mm pitch) - 54% smaller footprint, identical electrical specs but different thermal profile and rework process.	Better suited for space-constrained portable or wearable medical devices where board area is critical.	Choose for miniaturized designs accepting BGA assembly complexity and higher rework cost.

Compared with R5F521A6BDFP, R5F521A7BDFP offers headroom for feature-rich firmware, while R5F521A6BDLJ trades LQFP manufacturability for compactness - both retain identical peripheral sets, timing, and safety features, enabling scalable design migration.

Availability

R5F521A6BDFP is available at Aetrix Electronics and suitable for industrial energy metering, motor control feedback units, smart grid sensor nodes, and medical diagnostic instruments requiring stable component supply across long production lifecycles.

Supply support for R5F521A6BDFP 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 for industrial, automotive, and IoT markets - delivering high-reliability, low-power, and functionally safe silicon.

The RX21A Group targets precision analog-intensive embedded systems, combining high-resolution ∆Σ A/D, cryptographic acceleration, and robust real-time control - designed specifically for IEC60730-compliant industrial and medical equipment.

FAQ

What is the maximum operating frequency and power supply range for the R5F521A6BDFP?

The R5F521A6BDFP operates at up to 50 MHz when powered from 2.7 V to 3.6 V; it supports 1.8 V to 3.6 V operation at reduced 25 MHz maximum frequency. The core voltage range enables single-rail design flexibility while maintaining full peripheral functionality across its specified temperature range of −40°C to +85°C. This dual-voltage capability simplifies power architecture in battery-backed or wide-input industrial systems.

Does the R5F521A6BDFP include hardware encryption capabilities?

Yes, the R5F521A6BDFP integrates a Data Encryption Unit (DEU) supporting AES-128, AES-192, and AES-256 encryption and decryption in ECB and CBC modes. This hardware accelerator offloads cryptographic operations from the CPU, enabling secure firmware updates, encrypted sensor data transmission, and compliance with IEC60730 Class B security requirements - all without impacting real-time control performance.

How many analog-to-digital converter channels does the R5F521A6BDFP support, and what are their key specifications?

The R5F521A6BDFP integrates two independent A/D subsystems: a 24-bit ∆Σ converter with 7 channels (4 differential + 3 single-ended) and SNDR = 85 dB, plus a 10-bit SAR converter with 7 channels and 2.0 μs conversion time. Both include self-diagnostic and analog input disconnection detection - enabling simultaneous high-precision metrology and fast auxiliary sensing in a single chip.

What package type and pin count does the R5F521A6BDFP use?

The R5F521A6BDFP uses the PLQP0100KB-A package: a 100-pin LQFP with 14 × 14 mm body size and 0.5 mm pitch. This RoHS-compliant package features an exposed thermal pad (non-electrical) and is optimized for industrial PCB assembly processes, offering mechanical robustness and thermal performance suitable for convection-cooled applications.

Can the R5F521A6BDFP operate in low-power modes while retaining real-time clock functionality?

Yes, the R5F521A6BDFP supports deep software standby mode where the CPU, flash, and most peripherals are halted while the RTC remains fully operational using the 32.768 kHz sub-clock. It can wake up on RTC alarm, periodic interrupt, or external event - enabling ultra-low-power (<2 μA typical) timekeeping and scheduled wake-ups for battery-powered metering or sensor nodes.

R5F521A6BDFP#V0 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Package/Case:: 100-LQFP

Series:: RX200

Packaging:: Tray

Product Status:: Active

Programmable:: Not Verified

Core Processor:: RX

Core Size:: 32-Bit Single-Core

Speed:: 50MHz

Connectivity:: I2C, IrDA, SCI, SPI

Peripherals:: DMA, LVD, POR, PWM, WDT

Number of I/O:: 66

Program Memory Size:: 256KB (256K x 8)

Program Memory Type:: FLASH

EEPROM Size:: 8K x 8

RAM Size:: 32K x 8

Voltage - Supply (Vcc/Vdd):: 1.8V ~ 3.6V

Data Converters:: A/D 7x24b, 7x10b; D/A 2x10b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

R5F521A6BDFP#V0 FAQ

1.How can I place an order for R5F521A6BDFP#V0 through Aetrix?

Please submit a Request for Quotation (RFQ) for R5F521A6BDFP#V0 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for R5F521A6BDFP#V0 reliable?

The price and inventory of R5F521A6BDFP#V0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F521A6BDFP#V0 is usually 5 days.

3.What payment methods are accepted for R5F521A6BDFP#V0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F521A6BDFP#V0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for R5F521A6BDFP#V0?

R5F521A6BDFP#V0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your R5F521A6BDFP#V0 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for R5F521A6BDFP#V0?

For technical support, including R5F521A6BDFP#V0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F521A6BDFP#V0 requirements.

6.How does Aetrix verify that R5F521A6BDFP#V0 is sourced from the original manufacturer or authorized distributors?

All R5F521A6BDFP#V0 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that R5F521A6BDFP#V0 meets industry standards.

7.What is the process for return or replacement of R5F521A6BDFP#V0?

All R5F521A6BDFP#V0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F521A6BDFP#V0, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The R5F521A6BDFP#V0 part is unused and in its original packaging.

Return procedure for R5F521A6BDFP#V0:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…