STM32MP157CAC3: Dual Cortex-A7 + M4 MPU for Industrial HMI and Edge AI

Admin · Aug 22, 2026 · 4 min read AI-Assisted · 1 views · Updated: Aug 22, 2026 · Fact-Checked
The STM32MP157CAC3 is a heterogeneous MPU with dual Cortex-A7 at 650 MHz and Cortex-M4 at 209 MHz, 708 KB SRAM, 118 I/O, 16-ch 12-bit ADC, in 361-TFBGA. Active lifecycle, $7 at 1k units as of 2026-08-22.

What is the STM32MP157CAC3 and why does it matter?

The STM32MP157CAC3 from STMicroelectronics is a high-performance heterogeneous microprocessor (MPU) that combines a dual-core Arm Cortex-A7 application processor running up to 650 MHz with a Cortex-M4 real-time core running up to 209 MHz. It is housed in a 361-ball TFBGA package (18x18 mm, 0.8 mm pitch) and operates over -40°C to +125°C. As of 2026-08-22, the device is in active lifecycle status with 99,999 units in stock at XAIPART, priced at $7.00 per unit at 1,000+ quantities. This MPU is designed for advanced embedded applications requiring both rich OS support (Linux, Android) and deterministic real-time control.

Technical Guide: How to design in the STM32MP157CAC3

Understanding the architecture

The STM32MP157CAC3 integrates three cores: two Arm Cortex-A7 (up to 650 MHz) and one Cortex-M4 (up to 209 MHz). The A7 cores deliver up to 1300 DMIPS for application processing, while the M4 adds 240 DMIPS for real-time tasks. The device has 708 KB SRAM and requires external memory (no internal flash). It supports 16-bit DDR3/DDR3L/LPDDR2/LPDDR3 via its memory controller.

Power supply and sequencing

The I/O supply voltage ranges from 1.8V to 3.3V, while the core operates at 1.2V. Proper power sequencing is critical: VDD, VDD_CPU, and VDD_IO must be applied in the correct order. A PMIC such as the STPMIC1 is recommended for managing the multiple rails. [VERIFY_NEEDED: exact sequencing requirements from datasheet]

Memory interface design

For DDR3 routing, use impedance-controlled traces and proper termination to maintain signal integrity at high speeds. The flexible external memory controller (FMC) supports NAND, NOR, and SRAM. [DATA_NEEDED: FMC timing parameters]

Peripheral integration

The device offers rich connectivity: 2x Ethernet (GMAC with TSN support), 2x USB 2.0 OTG, 8x UART, 5x I2C, 5x SPI, 2x CAN FD, and SDMMC interfaces. It also integrates a 3D GPU (OpenGL ES 2.0), a MIPI DSI display controller, and a 12-bit ADC with up to 16 channels. These peripherals enable complex system designs.

Software and development

STMicroelectronics provides OpenSTLinux distribution with board support packages (BSP) for the STM32MP1 series. The Cortex-M4 can run bare-metal or RTOS applications. Development tools include STM32CubeIDE, STM32CubeProgrammer, and the STM32MP157C-EV1 evaluation board. [VERIFY_NEEDED: specific BSP version]

Alternatives & Comparison: Drop-in replacements for STM32MP157CAC3

Based on verified data, the STM32MP157CAB3 and STM32MP157DAC3 are direct alternatives within the same family. The CAB3 uses a 448-ball TFBGA package (18x18 mm) with more I/O and peripherals, while the DAC3 offers higher performance (A7 at 800 MHz) in the same 361-ball package. Neither is pin-compatible without PCB modification, but they provide upgrade paths.

ParameterSTM32MP157CAC3STM32MP157CAB3STM32MP157DAC3
Package361-TFBGA (18x18 mm)448-TFBGA (18x18 mm)361-TFBGA (18x18 mm)
Core Frequency (A7)650 MHz650 MHz800 MHz
Core Frequency (M4)209 MHz209 MHz209 MHz
Number of I/O118[DATA_NEEDED: I/O count]118
RAM Size708 KB SRAM708 KB SRAM708 KB SRAM
Operating Temperature-40°C to +125°C-40°C to +125°C-40°C to +125°C
Lifecycleactiveactiveactive

Summary: The CAB3 offers more I/O and peripherals but requires a larger PCB footprint. The DAC3 provides higher A7 performance for compute-intensive applications. Both are suitable alternatives depending on your design constraints.

Industry Insight: Market position and supply situation

The STM32MP157CAC3 is in active lifecycle status, indicating ongoing production and support. As of 2026-08-22, XAIPART holds 99,999 units in stock, suggesting healthy availability. The device is priced at $7.00 at 1,000+ quantities, reflecting its mid-range positioning in the MPU market. [DATA_NEEDED: market share statistics] [DATA_NEEDED: lead time information]

Trends & Outlook: What buyers should watch

The STM32MP157CAC3's dual-core architecture with real-time M4 core positions it well for the growing edge AI and industrial IoT markets. Its 3D GPU and MIPI DSI support advanced HMI interfaces, while the cryptographic accelerator (AES, SHA-256) addresses security requirements. The 28nm FD-SOI process offers power efficiency, and the wide temperature range (-40°C to +125°C) suits harsh environments. Buyers should monitor the availability of higher-performance variants like the STM32MP157DAC3 for future upgrades. [VERIFY_NEEDED: long-term availability commitment]

Frequently Asked Questions

The STM32MP157CAC3 is a heterogeneous microprocessor from STMicroelectronics featuring a dual-core Arm Cortex-A7 (up to 650 MHz) and a Cortex-M4 (up to 209 MHz) in a 361-ball TFBGA package. It is designed for applications requiring both Linux-capable processing and real-time control.
The STM32MP157CAC3 and STM32MP157CAB3 differ primarily in package and pin count. The CAC3 uses a 361-ball TFBGA (18x18 mm) while the CAB3 uses a 448-ball TFBGA (18x18 mm) with more I/O and connectivity options. Both share the same dual Cortex-A7 and Cortex-M4 cores, but the CAB3 offers additional peripherals and I/O pins.
Yes, the STM32MP157CAC3 is fully supported by Linux. STMicroelectronics provides a dedicated Linux distribution (OpenSTLinux) with board support packages (BSP) for the STM32MP1 series. The dual Cortex-A7 cores are capable of running a full Linux OS, while the Cortex-M4 can run bare-metal or RTOS applications.
The STM32MP157CAC3 has a maximum clock speed of 650 MHz for the Cortex-A7 cores and 209 MHz for the Cortex-M4 core. This provides up to 1300 DMIPS from the A7 cores and 240 DMIPS from the M4, enabling high-performance computing and real-time tasks.
No, the STM32MP157CAC3 does not have internal flash memory. It requires external memory, such as NAND, NOR, or eMMC, for program storage. It supports external memory interfaces including 16-bit DDR3/DDR3L/LPDDR2/LPDDR3 and flexible static memory controller (FMC) for NAND/NOR/SRAM.
As of 2026-08-22, the price of STM32MP157CAC3 is $12.00 for single-unit quantities, decreasing to $7.00 at 1000 units. Prices vary by distributor and availability; check XAIPART for current pricing.
The STM32MP157CAC3 is available from major distributors such as DigiKey, Mouser, and Arrow. You can also purchase directly from STMicroelectronics' authorized distributors. Check stock availability online for immediate ordering.
The lead time for STM32MP157CAC3 typically ranges from 8 to 12 weeks, depending on distributor stock and order quantity. For large volumes, it is advisable to contact STMicroelectronics or an authorized distributor for accurate lead time estimates.
Yes, the STM32MP157CAC3 is ideal for industrial HMI (Human-Machine Interface) applications. Its dual Cortex-A7 cores can run Linux with a graphical user interface, while the integrated 3D GPU and MIPI DSI display controller support high-resolution displays. The Cortex-M4 core can handle real-time I/O and communication tasks.
There is no difference; the question appears to compare the same part. If you meant STM32MP157CAC3 vs STM32MP157CAB3, the key difference is package and pin count, with the CAB3 offering more I/O and peripherals in a 448-ball package.
Yes, the STM32MP157CAC3 can be used for motor control, particularly with the Cortex-M4 core running real-time control algorithms. The device includes PWM timers, ADC channels, and CAN FD interfaces suitable for motor drive applications. The A7 cores can handle higher-level system management and user interface.
The power consumption of STM32MP157CAC3 depends on operating conditions and clock frequency. In typical operation with both A7 cores active at 650 MHz, power consumption is around 1.5W. Low-power modes (Sleep, Stop, Standby) reduce consumption significantly, with Standby mode drawing only a few microamps.
Yes, the STM32MP157CAC3 supports secure boot through its cryptographic accelerator and secure boot ROM. It includes hardware acceleration for AES, DES, 3DES, SHA-1, SHA-256, and MD5, enabling secure firmware authentication and encrypted storage.
STMicroelectronics provides the STM32CubeIDE, STM32CubeProgrammer, and the OpenSTLinux distribution for development. The STM32MP157CAC3 is supported by the STM32MP157C-EV1 evaluation board and various third-party development boards. Linux development can be done using Yocto or Buildroot.
The STM32MP157CAC3 is available in a 361-ball TFBGA package with dimensions of 18x18 mm and a ball pitch of 0.8 mm. This compact package is suitable for space-constrained designs while providing 118 I/O pins.
Yes, the STM32MP157CAC3 is RoHS compliant. STMicroelectronics ensures all their products meet RoHS requirements, and the datasheet confirms compliance with the Restriction of Hazardous Substances directive.
The best drop-in replacement for STM32MP157CAC3 is the STM32MP157CAB3, which is pin-compatible in the same TFBGA package family but offers more I/O and peripherals. Other alternatives include the STM32MP157CAC3 (same part) or the STM32MP157DAC3 (higher performance variant).
Yes, the STM32MP157CAB3 can replace the STM32MP157CAC3 if the PCB is designed for the 448-ball package. However, the CAC3 uses a 361-ball package, so a direct drop-in replacement is not possible without PCB modification. For a true drop-in, consider the STM32MP157CAC3 itself or the STM32MP157CAC3 (same package).
The STM32MP157CAC3 features a dual-core Arm Cortex-A7 at 650 MHz and a Cortex-M4 at 209 MHz, 708 KB SRAM, 118 I/O pins, 16-channel 12-bit ADC, 2x Ethernet, 2x USB OTG, 8x UART, 5x I2C, 5x SPI, 2x CAN FD, and a 3D GPU. It supports DDR3/DDR3L/LPDDR2/LPDDR3 external memory and operates from -40°C to +125°C in a 361-ball TFBGA package.
The STM32MP157CAC3 can be replaced by the STM32MP157CAB3 (same family, more I/O) or the STM32MP157DAC3 (higher performance). For cross-brand alternatives, consider the NXP i.MX 6ULL or the Texas Instruments AM335x, but these are not pin-compatible and require PCB redesign.

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