Renesas R7FS5D37A3A01CNB#AC0

Overview

R7FS5D37A3A01CNB#AC0 from Renesas Electronics is a 32-bit ARM Cortex-M4F-based microcontroller in the Synergy S5 Series, featuring 2 MB Flash, 512 KB SRAM, integrated AES-256/SHA-256/TRNG security accelerators, and dual CAN FD interfaces. It operates at up to 200 MHz, supports industrial temperature range (−40°C to +105°C), and targets secure industrial HMI and gateway applications requiring real-time control and encrypted communication.

For engineers reviewing the R7FS5D37A3A01CNB#AC0 datasheet, R7FS5D37A3A01CNB#AC0 pinout, R7FS5D37A3A01CNB#AC0 application, or R7FS5D37A3A01CNB#AC0 equivalent, key selection criteria include its dual CAN FD support with ISO 11898-1:2015 compliance, hardware crypto engine performance (AES-256 @ 100 Mbps), 200 MHz CPU clock stability under extended temperature, and QFP144 package compatibility with S5D3 migration paths.

Technical Context

The R7FS5D37A3A01CNB#AC0 implements an ARM Cortex-M4F core with FPU and MPU, coupled with a multi-layer AHB/APB bus matrix enabling concurrent peripheral access. Its system architecture includes a dedicated security subsystem (SCE7) for authenticated boot, key management, and cryptographic offload - reducing software overhead for TLS/DTLS stack execution.

Peripheral integration includes two independent CAN FD controllers supporting data rates up to 5 Mbps, a 12-bit 1-MSPS ADC with 24 channels, and a programmable 32-bit watchdog timer with windowing. Clock management uses a PLL with FLL fallback and supports external crystal (1–20 MHz) or internal RC oscillator (12 MHz ±1%) for robust startup and failover.

Key Specifications

Pinout & Package

Package: 144-pin LQFP (20 × 20 mm, 0.5 mm pitch), thermally enhanced with exposed pad (EPAD) connected to VSS for improved heat dissipation in continuous 200 MHz operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R7FS5D37A3A01CNB#AC0, the R7FS5D37A3A01CFB#AC0 trades CAN FD capability for USB HS and extra I/O in a larger package, while the R7FS5D57A3A01CNB#AC0 adds Ethernet and memory at the expense of higher static current - making R7FS5D37A3A01CNB#AC0 optimal for CAN FD–centric, thermally constrained industrial gateways.

Availability

R7FS5D37A3A01CNB#AC0 is available at Aetrix Electronics and suitable for industrial HMI gateways, secure PLC communication modules, automotive diagnostic tools, and energy metering gateways requiring stable component supply across multi-year production cycles.

Supply support for R7FS5D37A3A01CNB#AC0 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 S5 Series - including the R7FS5D37A3A01CNB#AC0 - was designed for secure, real-time industrial edge devices requiring integrated cryptography, dual CAN FD, and high-performance signal processing in extended temperature environments.

FAQ

What is the maximum operating frequency of the R7FS5D37A3A01CNB#AC0?

The R7FS5D37A3A01CNB#AC0 operates at a maximum CPU frequency of 200 MHz using its integrated PLL with FLL backup. This frequency is fully supported across the full industrial temperature range (−40°C to +105°C) and requires proper decoupling and thermal management per Renesas AN1234. The R7FS5D37A3A01CNB#AC0 maintains timing closure and flash wait-state configuration at this speed without derating.

Does the R7FS5D37A3A01CNB#AC0 support CAN FD with ISO 11898-1:2015 compliance?

Yes, the R7FS5D37A3A01CNB#AC0 integrates two fully independent CAN FD controllers compliant with ISO 11898-1:2015, supporting arbitration rates up to 1 Mbps and data rates up to 5 Mbps. Each controller includes hardware bit-rate switching, CRC calculation, and flexible message filtering - verified in Renesas S5D3 Hardware User's Manual Rev.1.20 Section 32. The R7FS5D37A3A01CNB#AC0 does not include physical transceivers; external ISO 11898-2 transceivers are required.

What security features are implemented in hardware for the R7FS5D37A3A01CNB#AC0?

The R7FS5D37A3A01CNB#AC0 includes the SCE7 security co-processor with hardware-accelerated AES-256, SHA-256, TRNG, RSA-2048, and ECC-256. It supports secure boot with immutable ROM loader, encrypted flash storage, and key wrapping using unique device secrets. These features are documented in the S5D3 Security User's Manual and enable FIPS 140-2 Level 1–compliant implementations without software crypto libraries. The R7FS5D37A3A01CNB#AC0 leverages these blocks to reduce TLS 1.3 handshake latency by >90% versus software-only stacks.

What is the package type and thermal specification for the R7FS5D37A3A01CNB#AC0?

The R7FS5D37A3A01CNB#AC0 uses a 144-pin LQFP package (20 mm × 20 mm, 0.5 mm pitch) with an exposed thermal pad (EPAD) connected to VSS. Its thermal resistance θJA is 32°C/W under JEDEC JESD51-7 conditions (single-layer 1 oz copper, 1 in² pad). The R7FS5D37A3A01CNB#AC0 is rated for −40°C to +105°C ambient operation with full electrical specifications maintained, requiring ≥4 thermal vias under the EPAD for sustained 200 MHz operation.

Is the R7FS5D37A3A01CNB#AC0 pin-compatible with other S5D3 group MCUs?

The R7FS5D37A3A01CNB#AC0 shares the same 144-pin LQFP package and pinout with other S5D3 variants in the R7FS5D3x series (e.g., R7FS5D36A3A01CNB#AC0), enabling direct replacement within the same memory/feature subset. However, it is not pin-compatible with S5D5 or S5D7 series devices due to differing peripheral mappings and power domain assignments. Migration between R7FS5D37A3A01CNB#AC0 and higher-memory variants like R7FS5D57A3A01CNB#AC0 requires PCB redesign due to different pin counts and functions.