When a design outgrows an entry-level Cortex-M3, the next stop is usually a Cortex-M4 with an FPU — and that is exactly the AT32F4 tier. Artery's AT32F4 line is where the family earns its "performance" label: higher clock, DSP-friendly core, more memory and advanced timers. This guide covers how to choose an AT32F4-class part and how the real AT32F403ACGT7 we stock sits in that picture.
1. Pick the core to the math
The difference between M3 and M4-with-FPU is not marketing — it is where your CPU time goes.
- Pure control / sequencing — an M3 (AT32F1 / F103 class) is enough and cheaper.
- Floating-point loops, estimation, light DSP — an M4 with FPU (AT32F4) pays for itself in determinism.
- Motor control, USB, advanced PWM — the AT32F4 advanced timers and higher clock are the right tool.
2. The AT32F4 part we stock
Our AT32F403ACGT7 is offered as an STM32F103C8T6 alternative and belongs to the AT32F4 performance tier. For reference, here are in-stock Cortex-M4 and F4-class devices you can compare it against.
| Part | Notes | Link |
|---|---|---|
| AT32F403ACGT7 | AT32F4 (Cortex-M4), STM32F103C8T6 alternative | AT32F403ACGT7 |
| STM32F405RGT6 | Cortex-M4, common F4-class reference | STM32F405RGT6 |
| STM32F407ZGT6 | Cortex-M4 with more memory/peripherals | STM32F407ZGT6 |
| STM32F411CEU6 | Cortex-M4, low-power dynamic-efficiency class | STM32F411CEU6 |
| STM32H743VIT6 | High-performance Cortex-M7 reference for top-end comparison | STM32H743VIT6 |
3. Comparison checklist
- Clock vs FPU need: if you do float math, prefer M4/FPU over a faster M3.
- Memory: Flash and RAM against your firmware plus buffer headroom.
- Peripherals: timers (advanced for motor), ADC channels, CAN/USB, serial count.
- Bench validation: clock tree, Flash wait states, ADC calibration, device ID / option bytes.
See the microcontroller range. Send the exact device you are comparing and your quantity for availability and a quote.
Frequently asked questions
What makes the AT32F4 different from an F103-class part?
The AT32F4 uses a Cortex-M4 core with a floating-point unit and runs at a higher maximum clock than typical F103-class devices. That matters for control loops, digital signal processing, USB and anything where the core spends time on math rather than just sequencing I/O.
When do I need the FPU?
If your firmware does floating-point arithmetic — sensor fusion, PID with fractional coefficients, FFT-lite, motor estimation — an FPU removes the soft-float overhead and keeps the loop deterministic. For pure integer control, an M3 part is often enough.
How do I compare an AT32F4 against an STM32F4?
Compare clock, Flash/RAM, the peripheral mix (timers, ADC, CAN, USB), and the advanced-timer features if you drive motors. Then validate on the bench: clock tree, Flash wait states, ADC behaviour and any unique device ID or option-byte code.
Is the AT32F403ACGT7 a drop-in for STM32F4?
No. The AT32F403ACGT7 we stock is positioned as an STM32F103C8T6 alternative, not an F4 drop-in. If your design is on an F4-class device, qualify the AT32F4 as a new part, not a swap — confirm package, pinout and peripheral behaviour first.
About us & trademarks: JTDZ Tech (Shenzhen Jingteng Electronics Technology Co., Ltd.) is an independent distributor of electronic components. We are not an authorised distributor or representative of the manufacturers named in this article. Manufacturer and part names are used for indicative purposes only, to help identify the components discussed; all trademarks remain the property of their respective owners. Always verify specifications against the official datasheet before design-in or purchase.
Recommended next steps
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