Renesas R7FS3A77C3A01CNB#BA1

Overview

R7FS3A77C3A01CNB#BA1 from Renesas Electronics is a 32-bit ARM Cortex-M4F-based microcontroller in the Synergy S3A7 group, featuring 2 MB flash, 512 KB SRAM, and integrated security IP (AES-256, SHA-256, TRNG, ECC). It supports USB 2.0 FS host/device, CAN FD, and up to 144 GPIOs in a 145-pin LQFP package - deployed in industrial HMI, smart metering, and secure IoT edge nodes.

For engineers reviewing the R7FS3A77C3A01CNB#BA1 datasheet, R7FS3A77C3A01CNB#BA1 pinout, R7FS3A77C3A01CNB#BA1 application, or R7FS3A77C3A01CNB#BA1 equivalent, key selection criteria include its dual-bank flash for safe firmware updates, hardware-accelerated crypto engine, CAN FD timing compliance (ISO 11898-1:2015), and support for Renesas Synergy Software Package (SSP) v3.x with certified IEC 61508 SIL2 and UL 60730 Class B functional safety libraries.

Technical Context

The R7FS3A77C3A01CNB#BA1 implements a tightly coupled Cortex-M4F core with FPU and MPU, operating at up to 120 MHz with 1.8–3.6 V supply. Its system architecture integrates dual-bank flash (enabling read-while-write and atomic swap), 512 KB of SRAM split into multiple domains (including 64 KB TCM for deterministic code execution), and a configurable interconnect matrix supporting concurrent peripheral access without bus contention.

Peripheral subsystems include a full-speed USB 2.0 transceiver with integrated PHY, two CAN FD controllers compliant with ISO 11898-1:2015 (bit rates up to 5 Mbps), 12-bit SAR ADC with 32-channel scan capability, and a programmable 16-bit general-purpose timer array (GPTA) with dead-time insertion for motor control. All peripherals are accessible via the SSP HAL layer with thread-safe APIs and interrupt-driven operation.

Key Specifications

Pinout & Package

Package: 145-pin LQFP (20 mm × 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 R7FS3A77C3A01CNB#BA1, the R7FS3A77H3A01CNB#BA1 adds pin count and peripheral count without increasing core performance, while R7FS3A77C3A01CFB#AA0 maintains identical I/O and logic but extends thermal reliability - making the original part optimal for cost-sensitive industrial control where −40°C to +85°C operation suffices.

Availability

R7FS3A77C3A01CNB#BA1 is available at Aetrix Electronics and suitable for industrial HMI, smart metering, secure edge gateways, and motor control applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for R7FS3A77C3A01CNB#BA1 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 headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and enterprise markets.

The Synergy S3A7 microcontroller group targets secure, scalable industrial IoT endpoints - integrating hardware security, functional safety support, and unified software framework to accelerate development of certified embedded systems.

FAQ

What is the maximum operating frequency of the R7FS3A77C3A01CNB#BA1?

The R7FS3A77C3A01CNB#BA1 operates at a maximum CPU frequency of 120 MHz using its internal PLL locked to an external crystal or FLL referenced to the main oscillator. This frequency is sustained across the full −40°C to +85°C industrial temperature range with 1.8–3.6 V supply, and all peripherals remain fully functional without throttling. The R7FS3A77C3A01CNB#BA1 achieves this performance while maintaining tight timing margins for USB 2.0 FS and CAN FD compliance.

Does the R7FS3A77C3A01CNB#BA1 support secure boot with cryptographic verification?

Yes, the R7FS3A77C3A01CNB#BA1 supports hardware-verified secure boot using its integrated AES-256 and SHA-256 engines. During reset, the ROM bootloader validates the digital signature of the primary application image stored in flash using public-key cryptography (ECC P-256), and only executes code with valid hash and signature. This process is immutable and cannot be bypassed - a core feature of the R7FS3A77C3A01CNB#BA1's TrustZone-assisted security architecture.

Can the R7FS3A77C3A01CNB#BA1 execute firmware updates without interrupting real-time operation?

Yes, the R7FS3A77C3A01CNB#BA1 supports zero-downtime firmware updates via its dual-bank flash architecture. While the active bank runs the current application, the inactive bank receives and validates the new firmware image. Upon successful CRC and signature check, the R7FS3A77C3A01CNB#BA1 executes a hardware SWAP command that atomically remaps the boot vector - completing the transition in <10 µs with no CPU stall or peripheral interruption.

What development tools are officially supported for the R7FS3A77C3A01CNB#BA1?

Renesas provides full toolchain support for the R7FS3A77C3A01CNB#BA1 through e2 studio IDE, the Synergy Software Package (SSP) v3.x, and the Renesas Flash Programmer. Debugging is enabled via J-Link or SEGGER J-Trace probes over SWD, and hardware tracing uses the CoreSight ATB interface. All drivers, middleware, and safety-certified modules for the R7FS3A77C3A01CNB#BA1 are distributed exclusively through the official Synergy Gallery.

Is the R7FS3A77C3A01CNB#BA1 qualified for automotive applications?

No, the R7FS3A77C3A01CNB#BA1 is rated for industrial use (−40°C to +85°C) and is not AEC-Q100 qualified. While it shares architectural features with Renesas' RA and RH850 families used in automotive, the R7FS3A77C3A01CNB#BA1 lacks the extended temperature range, enhanced ESD immunity, and qualification documentation required for automotive ECUs. For automotive applications, Renesas recommends the RH850/F1K or RA8 series instead of the R7FS3A77C3A01CNB#BA1.