Arduino Due vs ESP32-S3: 84 MHz Cortex-M3 vs 240 MHz Wireless MCU

The Arduino Due and ESP32-S3 are both 3.3 V 32-bit microcontroller platforms, but they come from very different generations.

The Due is based on the:

A typical ESP32-S3 development board such as ESP32-S3-DevKitC-1 uses:

The Due’s strength is its large, simple Arduino header layout with four UARTs, dual DAC and a very mature SAM3X ecosystem.

ESP32-S3’s strength is modern connected computing: much faster CPU performance, Wi-Fi/BLE, optional PSRAM, native USB/JTAG and a far larger software ecosystem for IoT, audio and Edge AI.

Quick Comparison

Feature	Arduino Due	ESP32-S3
Main MCU	SAM3X8E	ESP32-S3
CPU	Arm Cortex-M3	Dual-core Xtensa LX7
Clock	84 MHz	Up to 240 MHz
Logic voltage	3.3 V	3.3 V
Internal SRAM	96 kB	512 kB
Flash	512 kB internal	External; module-dependent
PSRAM	No	Optional; module-dependent
Digital I/O	54 dedicated digital pins	45 programmable GPIO at SoC level
Analog inputs	12	20 ADC channels at SoC level
ADC	12-bit hardware	2 × 12-bit SAR ADC
True DAC	2 × 12-bit	No true DAC
PWM	12 pins	Flexible LEDC/MCPWM
UART	4	3
I2C	2	2
SPI	1 main SPI header	Multiple SPI controllers
CAN/TWAI	2 CAN controllers in SAM3X8E	1 TWAI controller
Wi-Fi	No	2.4 GHz Wi-Fi 4
Bluetooth	No	Bluetooth 5 LE
USB	Native USB OTG + programming USB	USB OTG + USB Serial/JTAG
Touch sensing	No	Yes
AI/DSP acceleration	No dedicated vector extensions	Vector instructions

Both Are 3.3 V Platforms

Unlike Mega 2560, both Due and ESP32-S3 use:

That means neither should be treated as a 5 V-tolerant platform.

This makes migration electrically easier between the two than between Mega and ESP32-S3, but you still need to check:

• pin assignments;
• analog ranges;
• peripheral voltage levels;
• USB use;
• module-specific GPIO restrictions.

CPU Performance

Due:

ESP32-S3:

ESP32-S3 has a clear performance advantage.

It is better suited to:

• networking;
• TLS;
• large JSON documents;
• audio processing;
• graphics;
• machine learning;
• parallel tasks.

Dual-Core Execution

ESP32-S3 runs Arduino on top of FreeRTOS.

That lets you divide work into tasks such as:

Due uses a simpler single-core application model.

Vector Instructions Give ESP32-S3 an Edge in DSP and AI

ESP32-S3 includes vector instructions designed to accelerate operations common in:

• DSP;
• neural-network inference;
• audio;
• signal processing.

Espressif supports these through libraries such as:

Due does not have comparable vector acceleration.

RAM: ESP32-S3 Has More Than Five Times the Internal SRAM

Due:

ESP32-S3:

That difference is already substantial.

ESP32-S3 then adds the option of external PSRAM.

PSRAM Is a Major ESP32-S3 Advantage

Many ESP32-S3 modules provide:

of PSRAM depending on module configuration.

This enables:

• camera framebuffers;
• large display buffers;
• audio ring buffers;
• large ML tensors;
• large MicroPython heaps;
• large network buffers.

Due has no comparable external-memory architecture onboard.

Flash Storage

Due contains:

ESP32-S3 uses external Flash integrated into the selected module.

Common modules provide several megabytes, and high-memory variants provide much more.

This makes ESP32-S3 better suited to:

• OTA partitions;
• filesystems;
• web assets;
• large firmware;
• ML models.

GPIO: Due Has the Simpler Large Header

Due exposes:

in a large Arduino-compatible layout.

ESP32-S3 contains:

at SoC level, but the number freely usable on a development board depends on the module and memory configuration.

DevKitC-1 GPIO Availability Depends on Module Variant

On ESP32-S3-DevKitC-1 boards using Octal Flash/PSRAM variants:

are used internally for memory communication and are not available externally.

This is an important difference from Due, where the large header assignment is fixed and much easier to reason about.

Strapping Pins

ESP32-S3 also has boot strapping pins whose levels are sampled during reset.

On common S3 boards these include pins such as:

External circuits should not force inappropriate boot states.

Due has fewer pin-selection complications of this kind.

Analog Inputs

Due exposes:

with 12-bit hardware ADC support.

ESP32-S3 has:

although not every ADC-capable pin is necessarily exposed or conveniently usable on every development board.

Due ADC Is Simpler

Due’s analog system is very Arduino-like:

and the input range is:

ESP32-S3 ADC operation can involve:

• attenuation;
• calibration;
• ADC1 vs ADC2;
• continuous/DMA modes.

S3 is more flexible, but Due can be easier for straightforward analog measurement.

Due Has Two True DAC Outputs

Due provides:

with 12-bit DAC hardware.

ESP32-S3 has:

This is a genuine Due advantage.

Due DAC Voltage Range

The Due DAC output is approximately:

rather than a full 0-3.3 V swing.

Even with that limitation, it is still a true analogue output.

ESP32-S3 requires:

• external DAC;
• PWM + filter;
• I2S audio DAC/codec.

for real analogue voltage output.

PWM

Due provides:

as its 12 PWM-capable digital pins.

ESP32-S3 uses flexible:

• LEDC;
• MCPWM;
• RMT;

peripherals.

The S3 approach is more configurable and better suited to advanced motor-control and waveform generation.

UART Count: Due Wins

Due provides:

ESP32-S3 provides:

If a design needs four independent hardware serial links, Due has the raw-count advantage.

ESP32-S3 Has Flexible UART Routing

The GPIO matrix allows UART signals to be routed to many suitable pins.

That makes custom PCB routing easier than Due’s fixed header arrangement.

I2C

Both platforms provide:

Due exposes them as:

with dedicated board pins.

ESP32-S3 can route I2C signals flexibly through its GPIO matrix.

SPI

Due uses its:

for the main SPI interface.

ESP32-S3 provides multiple SPI controllers, though some are used by external Flash/PSRAM depending on module configuration.

For complex systems with several high-speed SPI peripherals, S3 is generally more flexible.

CAN vs TWAI

Due’s SAM3X8E contains:

ESP32-S3 contains:

compatible with classic CAN-style communication.

Both require an external physical CAN transceiver.

Due Wins on Raw CAN Controller Count

If the project specifically needs:

Due has a real hardware advantage.

ESP32-S3 would need an external CAN controller for an additional independent bus.

Wi-Fi Is a Major ESP32-S3 Advantage

ESP32-S3 integrates:

Due has no onboard Wi-Fi.

S3 can directly run:

• MQTT;
• HTTP/HTTPS;
• web servers;
• OTA updates;
• Home Assistant integrations;
• cloud APIs.

Bluetooth LE

ESP32-S3 includes:

Due has no onboard Bluetooth.

For phone configuration, BLE sensing or provisioning, S3 avoids the need for an external module.

ESP-NOW

ESP32-S3 supports:

for direct peer-to-peer ESP-family communication.

Due has no equivalent integrated radio protocol.

Native USB: Both Are Capable

Due includes a native SAM3X USB OTG port.

ESP32-S3 includes:

Both can support advanced USB device functions.

ESP32-S3 Has the Better Debugging Story

USB Serial/JTAG combines:

• flashing;
• serial console;
• JTAG debugging;

through the native ESP32-S3 USB interface.

Due has a JTAG header, but typically requires an external debugger for JTAG use.

USB Pins on ESP32-S3

Native USB uses:

on ESP32-S3.

If USB is active, those pins should not be treated as free general-purpose I/O.

Touch Sensing

ESP32-S3 includes capacitive-touch hardware.

That enables:

• touch buttons;
• sliders;
• simple proximity sensing.

Due has no dedicated touch peripheral.

Camera and Display Work

ESP32-S3 includes interfaces suitable for:

• parallel camera input;
• LCD output;
• I2S audio;
• DMA-driven data movement.

Combined with optional PSRAM, this makes S3 much more suitable for:

• camera projects;
• graphical HMIs;
• audio;
• Edge AI.

Due has neither the memory capacity nor the specialised peripheral ecosystem to compete well in those workloads.

Security

ESP32-S3 includes modern security features such as:

• secure boot;
• Flash encryption;
• eFuses;
• AES;
• RSA;
• SHA;
• HMAC;
• digital-signature hardware.

Due does not provide an equivalent modern secure-boot and encrypted-Flash architecture.

Low-Power Operation

ESP32-S3 provides:

• deep sleep;
• RTC memory;
• ULP coprocessor;
• radio power-management features.

Due supports MCU sleep modes, but it was not designed around the same battery-oriented connected-IoT architecture.

Software Ecosystem

Due uses the Arduino SAM core and a mature set of SAM3X-specific libraries.

ESP32-S3 can use:

• Arduino-ESP32;
• ESP-IDF;
• FreeRTOS;
• ESP-NN/ESP-DSP/ESP-DL;
• MicroPython;
• ESPHome;
• ESP-NOW.

For modern IoT and connected embedded development, the ESP32-S3 ecosystem is much broader.

Porting Due Code to ESP32-S3

High-level Arduino code using:

is generally the easiest to move.

Code using:

• SAM3X timer registers;
• Due-specific CAN libraries;
• Due Native USB internals;
• PIO controller registers;

will require redesign.

Which Is Better for Many Direct GPIO?

Due is attractive because its:

are presented in a large, fixed Arduino header layout.

ESP32-S3 has many GPIO, but board/module restrictions make pin planning more complex.

Which Is Better for Four Serial Devices?

Due.

It provides four hardware UARTs versus three on ESP32-S3.

Which Is Better for True Analog Output?

Due.

It has two true 12-bit DAC outputs.

Which Is Better for Dual CAN?

Due.

SAM3X8E contains two CAN controllers.

Which Is Better for Wi-Fi/BLE?

ESP32-S3.

Both radios are integrated.

Which Is Better for USB Debugging?

ESP32-S3.

Its integrated USB Serial/JTAG is significantly more convenient.

Which Is Better for Camera, Display or Audio?

ESP32-S3 by a large margin.

Which Is Better for TinyML?

ESP32-S3.

The combination of:

puts it in a completely different Edge AI class.

Which Is Better for Existing Due Shields?

Due.

If the project already depends on:

• Due-specific shields;
• 54-pin large header arrangement;
• dual DAC;
• four UARTs;
• SAM3X-specific libraries;

keeping Due may avoid unnecessary redesign.

Which Is Better for a New Connected Project?

ESP32-S3 is normally the stronger starting point because it integrates:

• Wi-Fi;
• BLE;
• much more RAM;
• optional PSRAM;
• native USB/JTAG;
• modern security;
• IoT software ecosystem.

Decision Table

Requirement	Better fit
Large fixed Arduino header layout	Arduino Due
Four UARTs	Arduino Due
Two true DAC outputs	Arduino Due
Two CAN controllers	Arduino Due
Existing Due shields/software	Arduino Due
CPU performance	ESP32-S3
More internal SRAM	ESP32-S3
External PSRAM	ESP32-S3
Wi-Fi	ESP32-S3
Bluetooth LE	ESP32-S3
ESP-NOW	ESP32-S3
Integrated USB/JTAG	ESP32-S3
Touch sensing	ESP32-S3
Camera/display/audio	ESP32-S3
TinyML / DSP	ESP32-S3
Modern secure IoT	ESP32-S3

Quick Reference

Final Thoughts

Arduino Due remains a useful large-format 3.3 V board when you need:

• 54 straightforward digital pins;
• four UARTs;
• two DAC outputs;
• dual CAN controllers;
• existing Due hardware compatibility.

ESP32-S3 is the far stronger general-purpose platform for new connected designs.

It brings:

• dual-core 240 MHz processing;
• more than five times the internal SRAM;
• optional PSRAM;
• Wi-Fi;
• BLE 5;
• ESP-NOW;
• native USB/JTAG;
• touch;
• vector acceleration;
• modern security.

The simplest decision rule is:

For detailed pin information, see our Arduino Due pinout guide and ESP32-S3 DevKitC-1 pinout and safe GPIO guide.