STMicroelectronics STM32H735IGT3

Overview

STM32H735IGT3 from STMicroelectronics is a high-performance Arm® Cortex®-M7 32-bit microcontroller operating at up to 550 MHz, featuring 1 MB embedded flash with ECC, 564 KB SRAM (all with ECC), dual 16-bit ADCs delivering up to 3.6 MSPS, triple FD-CAN interfaces, and hardware-accelerated graphics via Chrom-ART Accelerator - deployed in industrial HMI controllers requiring real-time response, deterministic Ethernet communication, and secure firmware updates.

For engineers reviewing the STM32H735IGT3 datasheet, STM32H735IGT3 pinout, STM32H735IGT3 application, or STM32H735IGT3 equivalent, key selection criteria include its dual-core-capable memory architecture (128 KB TCM RAM + 432 KB system RAM), on-the-fly Octo-SPI decryption (OTFDEC), integrated DCDC regulator, and support for USB HS/FS OTG, Ethernet MAC, and HDMI-CEC - all within a VFQFPN68 (8×8 mm) package.

Technical Context

The STM32H735IGT3 implements a dual-bank Arm Cortex-M7 core with DP-FPU, L1 instruction/data caches (32 KB each), and MPU - enabling zero-wait-state execution from flash and external memories. Its memory subsystem includes ECC-protected 1 MB flash, 564 KB SRAM (128 KB data TCM + 432 KB system RAM + 4 KB backup SRAM), and flexible external memory controller supporting SDRAM, NOR/NAND, and PSRAM.

Peripherals are architected for deterministic real-time operation: 24 timers (including 5 low-power 16-bit timers active in Stop mode), 3x FD-CAN controllers compliant with ISO 11898-1:2015, dual 16-bit ADCs with interleaved mode (7.2 MSPS), and cryptographic accelerators (AES-128/192/256, HASH, HMAC, CORDIC, FMAC) tightly coupled to DMA channels including MDMA with linked-list support.

Key Specifications

Pinout & Package

VFQFPN68 (8 × 8 mm, 0.4 mm pitch) package with exposed thermal pad (EPAD) for enhanced thermal dissipation in high-clock, multi-peripheral operation. Pin count: 68 terminals. RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-performance MCU applications.

Compared with STM32H735IGT3, the STM32H743VIT6 offers greater memory headroom at the cost of DCDC integration and larger footprint, while the STM32H753IIK6 extends security capability with PKA - making the H735IGT3 optimal for cost-sensitive, space-constrained industrial HMI and gateway designs where DCDC efficiency and compact VFQFPN68 are decisive.

Availability

STM32H735IGT3 is available at Aetrix Electronics and suitable for industrial HMI controllers, automotive gateways, secure IoT edge nodes, and high-performance motor drives requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for STM32H735IGT3 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, rich connectivity, and hardware-enforced security - with the H735IGT3 specifically optimized for compact, thermally constrained designs requiring integrated DCDC and FD-CAN/Ethernet convergence.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32H735IGT3 achieves 550 MHz via its Arm Cortex-M7 core with dual 32 KB L1 caches (instruction and data), allowing zero-wait-state execution from embedded flash. This requires proper VDD supply stability, correct HSE/PLL configuration (e.g., PLL1_VCO=1.1 GHz, DIVR=2), and adherence to the 1.62–3.6 V VDD range. Thermal derating begins above 85°C ambient.

Does the VFQFPN68 package include an exposed thermal pad, and is it electrically connected?

Yes, the VFQFPN68 package features an exposed thermal pad (EPAD) centered on the bottom surface, which must be soldered to a PCB thermal plane for reliable thermal management. The EPAD is internally connected to VSS and serves as the primary heat dissipation path - not electrically isolated - and requires appropriate stencil design and reflow profile per ST's AN5053 guidelines.

How does the integrated DCDC regulator differ from the LDO option in other H7 variants?

The STM32H735IGT3's integrated DCDC is a synchronous buck converter supporting 1.8–3.3 V output, delivering up to 200 mA with >85% efficiency at mid-load - unlike LDO-based variants (e.g., H743), it reduces power loss and thermal load significantly. It is enabled by default at power-on and requires only external input/output capacitors and a single inductor (1.5 µH typical).

Can the three FD-CAN controllers operate simultaneously with full ISO 11898-1:2015 compliance?

Yes, all three FD-CAN controllers (FDCAN1, FDCAN2, FDCAN3) are fully independent, each with dedicated message RAM, filters, and timestamping logic. They support simultaneous operation at up to 5 Mbps data phase and 1 Mbps arbitration phase, with full ISO 11898-1:2015 conformance including bit error detection, automatic retransmission, and loop-back self-test mode.