The STM32F407ZGT6 is an Arm Cortex-M4 microcontroller for firmware-based control and signal processing. When selecting it, distinguish the resources on the chip from the memory and physical interfaces available to a particular board. The most consequential checks are DMA buffer placement, USB speed, Ethernet hardware and the complete LQFP144 pin assignment.
STM32F407ZGT6 specifications and package
| Resource | STM32F407ZGT6 |
|---|---|
| CPU | Cortex-M4, up to 168 MHz; single-precision floating-point unit |
| Program memory | 1 MiB on-chip Flash |
| Working memory | 192 KiB SRAM: 128 KiB ordinary SRAM plus 64 KiB CCM; separate 4 KiB backup SRAM |
| Package | 144-lead LQFP, 20 × 20 mm body, 0.5 mm lead pitch |
| Serial interfaces | 3 SPI; 2 support multiplexed full-duplex I2S |
| Temperature suffix 6 | −40 to +85 °C ambient range, subject to operating conditions |
Use ST DS8626: STM32F405/407 datasheet for exact ordering, package and electrical limits. Family-level maxima do not mean every interface can be routed simultaneously.
Memory planning: why 192 KiB is not one DMA buffer
The CCM region is connected to the CPU rather than the DMA-accessible bus matrix. Place peripheral DMA buffers in accessible SRAM and use CCM for suitable CPU-only data. A successful linker allocation alone does not prove that a peripheral can access the resulting address. The bus connections and arbitration are documented in ST AN4031: DMA controller and bus architecture.
Worked acquisition budget: suppose eight channels produce 20,000 samples per second each and software stores each sample in two bytes. One 10 ms block needs 8 × 20,000 × 2 × 0.010 = 3,200 bytes. Two alternating buffers need 6,400 bytes, excluding descriptors, queues and processing workspace. Check the actual linker map and the DMA stream assignments before deciding how much space remains.
A separate image example makes the limit clearer: one 320 × 240 frame at two bytes per pixel occupies 153,600 bytes. That exceeds 128 KiB (131,072 bytes) before other allocations. Counting CCM toward a direct camera DMA frame would hide this problem. Possible architectural responses include processing smaller blocks or evaluating external memory; neither is a guarantee that the required frame rate will be achieved.
USB and Ethernet need a complete hardware path
The chip includes an Ethernet MAC, which still needs an external PHY and board-level interface. Its USB OTG HS controller has an integrated full-speed PHY; high-speed 480 Mbit/s operation requires an external ULPI PHY. An HS controller label therefore does not make a USB connector high speed by itself. See the connectivity sections of ST STM32F407ZG product documentation.
Before buying a development board, identify its PHY part number, populated connector circuitry and routed signals. Then define a transfer-size and sustained-throughput test using the intended host and firmware. A nominal link rate is not an application payload rate. Include simultaneous peripheral traffic in the test rather than measuring each interface only in isolation.
Pinout and bring-up review
Use the LQFP144 pin table and package drawing, not a generic STM32F4 breakout diagram. Build a pin-allocation sheet covering power, reset, debug, oscillators and every enabled peripheral. Resolve alternate-function conflicts before PCB placement. A pin carrying a peripheral function cannot also be counted as a free GPIO in the same configuration.
Follow ST AN4488: STM32F4 hardware development for supply connections, regulator capacitors, reset and clock design. Check the selected package and regulator mode before choosing component values. Preserve access to the programming interface and establish a minimal startup test before enabling network or acquisition workloads. Record the measured supply rails and reset behavior so a later firmware issue can be separated from a hardware startup failure.
Performance and replacement decisions
The FPU executes floating-point instructions within the CPU; it is not an independent processor that runs calculations without CPU work. Hardware acceleration is single precision. Inspect compiler settings and library types before assuming that a calculation uses that hardware. Benchmark the application with its actual interrupt load and memory placement.
A related STM32F4 order code is a candidate for evaluation, not an approved substitute. Create a comparison covering package pins, supply requirements, clock setup, memory map, peripherals, errata and firmware dependencies. Retest the changed board configuration. A matching package or faster advertised CPU alone does not establish compatibility, and this guide assigns no drop-in replacement status.
Ordering and documentation
For a quotation, provide the complete order code, quantity, delivery date and any lot or documentation requirements. WWDParts confirms commercial terms in the written quotation. Find STM32F407ZGT6 in the catalog or prepare an RFQ.
Manufacturer references
- ST DS8626: STM32F405/407 datasheet
- ST STM32F407ZG product documentation
- ST AN4031: DMA controller and bus architecture
- ST AN4488: STM32F4 hardware development
Technical content reviewed October 12, 2026 against the linked manufacturer documents. Calculations are design examples, not measured board results.