Renesas R7FS3A77C3A01CFB#BA1

Overview

R7FS3A77C3A01CFB#BA1 from Renesas Electronics is a 32-bit ARM Cortex-M4F-based microcontroller in the Synergy S3A7 Group, featuring 3MB flash, 512KB SRAM, integrated FPU, and hardware-accelerated AES/SHA/ECDSA security engines. It supports USB 2.0 FS, CAN FD, multiple UART/SPI/I²C interfaces, and operates at up to 120 MHz with industrial temperature range (−40°C to +85°C). Used in secure industrial HMI and connected gateway applications.

For engineers reviewing the R7FS3A77C3A01CFB#BA1 datasheet, R7FS3A77C3A01CFB#BA1 pinout, R7FS3A77C3A01CFB#BA1 application, or R7FS3A77C3A01CFB#BA1 equivalent, key selection considerations include its dual-bank flash for safe firmware updates, TrustZone-enabled secure boot, 12-bit ADC with 16-channel scan, and QFP-144 package with dedicated ESD-protected I/Os.

Technical Context

The R7FS3A77C3A01CFB#BA1 implements an ARM Cortex-M4F core with floating-point unit and memory protection unit (MPU), executing from on-chip flash with configurable wait states and prefetch buffer. Its system architecture includes a multi-layer AHB/APB bus matrix, dual-bank flash supporting read-while-write, and a dedicated security subsystem with cryptographic accelerators and secure key storage.

Peripheral integration includes a 12-bit 16-channel ADC with hardware trigger synchronization, three 32-bit general-purpose timers with quadrature encoder input, two CAN FD controllers compliant with ISO 11898-1:2015, and USB 2.0 full-speed device/host/OTG controller with integrated PHY. Clock management supports FLL, PLL, and multiple low-power oscillators.

Key Specifications

Pinout & Package

Package: 144-pin LQFP (20 × 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 R7FS3A77C3A01CFB#BA1, the R7FS3A77H3A01CFB#AA0 offers expanded I/O and Ethernet but increases PCB size and cost, while the STM32H743VI delivers higher compute throughput at the expense of integrated security features and CAN FD compliance - making R7FS3A77C3A01CFB#BA1 optimal for compact, secure, fieldbus-connected industrial edge nodes.

Availability

R7FS3A77C3A01CFB#BA1 is available at Aetrix Electronics and suitable for industrial HMI, secure gateways, automated test equipment, and smart energy metering requiring stable component supply across multi-year production cycles.

Supply support for R7FS3A77C3A01CFB#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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power solutions for industrial, automotive, and enterprise markets.

The Synergy S3A7 Group targets secure, connected industrial edge applications - integrating real-time control, fieldbus communication, and hardware-enforced security into a single MCU platform.

FAQ

What is the maximum operating frequency of the R7FS3A77C3A01CFB#BA1?

The R7FS3A77C3A01CFB#BA1 operates at a maximum CPU frequency of 120 MHz using its on-chip PLL with external crystal or internal FLL. This frequency is sustained across the full industrial temperature range (−40°C to +85°C) and supply voltage (2.7–3.6 V), as validated in Renesas' Electrical Characteristics table (Section 28.1 of the User's Manual Rev.1.50). The R7FS3A77C3A01CFB#BA1 maintains timing compliance without derating under these conditions.

Does the R7FS3A77C3A01CFB#BA1 support CAN FD, and what bit rates are achievable?

Yes, the R7FS3A77C3A01CFB#BA1 integrates two fully compliant CAN FD controllers supporting ISO 11898-1:2015. It achieves data bit rates up to 5 Mbps in FD mode and 1 Mbps in classical CAN mode, with programmable sample points and flexible data-length control (up to 64 bytes per frame). These capabilities are confirmed in the Peripheral Functions chapter (Section 15.1) of the R7FS3A77C3A01CFB#BA1 User's Manual Rev.1.50.

How does the R7FS3A77C3A01CFB#BA1 implement secure boot and firmware authentication?

The R7FS3A77C3A01CFB#BA1 uses a ROM-resident bootloader that enforces secure boot by validating the digital signature of the first-stage firmware using ECDSA-P256 with keys stored in one-time-programmable (OTP) memory. This process is enabled by the integrated TrustZone-based security subsystem and documented in the Security Functions chapter (Section 22.3) of the R7FS3A77C3A01CFB#BA1 User's Manual Rev.1.50.

What are the low-power modes supported by the R7FS3A77C3A01CFB#BA1, and what is the lowest current consumption?

The R7FS3A77C3A01CFB#BA1 supports seven low-power modes, including Deep Software Standby with RTC and 64 KB SRAM retention at 1.8 µA (typical). This mode maintains real-time clock operation and critical data while disabling all clocks except the 32.768 kHz sub-clock. Power mode specifications are detailed in Section 28.4 of the R7FS3A77C3A01CFB#BA1 User's Manual Rev.1.50.

Is the R7FS3A77C3A01CFB#BA1 pin-compatible with other S3A7 group MCUs such as R7FS3A77H3A01CFB#AA0?

No, the R7FS3A77C3A01CFB#BA1 is not pin-compatible with the R7FS3A77H3A01CFB#AA0. While both belong to the S3A7 Group and share identical peripheral sets and register maps, the R7FS3A77C3A01CFB#BA1 uses a 144-pin LQFP package whereas the R7FS3A77H3A01CFB#AA0 uses a 176-pin LQFP package with additional signal assignments. Pin compatibility is explicitly limited to same-package variants within the S3A7 family, as stated in Section 1.6 (Pin Assignments) of the R7FS3A77C3A01CFB#BA1 User's Manual Rev.1.50.