ESP32-C3 vs ESP32-S3 Explained: Performance, Features, and How to Choose the Right Chip

If you are making a prototype that connects to the internet using WIFI or transmits data over BLE, the most popular option among designers is ESP32. The two most popular chips from the ESP32 series are: ESP32-c3 and ESP32-s3. The pain point is to choose the one as per the required application.

The ESP32-c3 vs ESP32-s3 decision trips up beginners and seasoned engineers alike, because on paper, both are 2.4 GHz Wi-Fi and Bluetooth chips that "just work." But they are built for completely different jobs.

In this guide, you will learn:

• Quick side-by-side comparison of the ESP32-C3 and ESP32-S3.
• Key hardware and architectural differences at a glance.
• CPU, memory, GPIO, USB, Wi-Fi, and Bluetooth comparisons.
• AI acceleration, camera, and display capabilities explained.
• Power consumption and battery-life considerations.
• Price differences and overall value for different applications.
• A practical framework to help you choose the right ESP32 for your project.

ESP32-C3 vs ESP32-S3: Quick Comparison Table

Figure: ESP32-c3 VS ESP32-s3

The table below is the authoritative spec comparison of ESP32-c3 and ESP32-s3. Every row is cross-checked against Espressif's official datasheets.

ESP32-C3 vs S3: Key Differences at a Glance

First is the cores: C3 is a single-core RISC-V, and S3 is a dual-core Xtensa LX7.

Second is the memory: S3 can have external PSRAM (up to 16 MB), but the C3 cannot.

The third is interfaces: S3 offers much better support for native USB-OTG, camera, LCD, and AI vector instructions, which are missing in C3.

Here is the difference in a bullet list:

• CPU: C3 contains 1 RISC-V Core, while S3 contains 2 Xtensa LX7 Cores for true multitasking.
• Speed: 160 MHz on the C3 versus 240 MHz on the S3.
• Memory: 400 KB SRAM / 512 KB SRAM (PSRAM is S3-only).
• GPIO: 22 pins on the C3 versus 45 on the S3.
• USB - basic serial/JTAG on C3, versus full USB-OTG host and device on S3.
• Multimedia & AI: Camera, LCD, vector AI are the exclusive features of the S3.
• Cost and power: C3 is cheaper and has less idle power; S3 is more capable.

Now, let us see the comparison in detail, one by one.

CPU Overview: ESP32-C3 vs ESP32-S3

Figure: ESP32-c3 and ESP32-s3 CPU Overview

ESP32-C3: The Low-Cost RISC-V IoT Chip

ESP32-C3 is Espressif's solution to the issue of a low-cost and low-power Wi-Fi/BLE chip. It is equipped with a single RISC-V 32-bit core clocked up to 160 MHz, 400 KB of SRAM, 384 KB of ROM, and integrated 2.4 GHz Wi-Fi 4 and Bluetooth LE 5.0. No PSRAM and no native USB-OTG, which helps to keep the die and BoM small.

With that lean design, the C3 is perfect for Battery Sensors, Smart Plugs, BLE Beacons and simple connected controls. It's frequently sold as an update to the older ESP8266, with modern security features and BLE at a comparable price.

ESP32-S3: The Dual-Core AI and Multimedia Chip

The ESP32-S3 is quite a different animal. Features 2 Xtensa LX7 cores running up to 240MHz, 512KB of SRAM, and up to 16MB of external Octal PSRAM for large frame buffers and models. It has the same 2.4 GHz Wi-Fi 4 and BLE 5.0 radio as the C3.

The unique thing about the S3, in addition to the CPU, is all the other stuff: 128-bit SIMD vector instructions to speed up neural networks, native USB-OTG, LCD and RGB display interfaces, plus a DVP camera interface. It's the chip for voice assistants, camera doorbells, edge-AI gadgets and rich touch screen HMIs.

ESP32-C3 vs ESP32-S3: CPU Architecture (RISC-V vs Xtensa LX7)

The main difference between the ESP32-c3 and ESP32-s3 is the single-core RISC-V and the dual-core Xtensa LX7.

The C3 has a single open-standard RISC-V core operating at 160 MHz, sufficient for polling sensors, protocol stacks, and light control loops.

The S3 has 2 proprietary Xtensa LX7 240 MHz cores, of which one can be used for Wi-Fi and the other for your application.

This is most important when you need to do two heavyweight tasks simultaneously, like stream camera data and run a network stack, in your firmware.

On a single-core C3, those tasks time-share and can choke each other. On the dual-core S3, they run in parallel, hence the near-inevitable association of real-time multimedia work with the S3. Both employ the same Espressif toolchain and ESP-IDF framework, and differences between architectures seldom affect the high-level code. It primarily affects the number of tasks running at the same time.

Memory and PSRAM Comparison: ESP32-S3 vs ESP32-C3

For memory, the headline is PSRAM. The ESP32-C3 has 400 KB of on-chip SRAM and no PSRAM support, while the ESP32-S3 has 512 KB of SRAM and can add up to 16 MB of external Octal PSRAM. If your project needs big buffers, the S3 is the only real choice.

Do you know “Why does PSRAM matter so much?” A single VGA camera frame or a modest TensorFlow Lite model can blow past 400 KB in an instant. Without external PSRAM, the C3 simply cannot hold that data, which is the hard technical reason it is not used for cameras or on-device AI.

On the C3, 400K for everyday connected devices that are moving mostly small packets is comfortable. Once images, audio buffers, or ML models come into the frame, it's the S3 with PSRAM you are looking for.

GPIO and Peripherals Comparison: ESP32-S3 vs C3

One of the most straightforward and practical distinctions is the number of pins (GPIO) each processor has: the ESP32-C3 has 22 GPIO, whereas the ESP32-S3 has 45 GPIO. That doubles the peripherals, sensors, and buses you can wire up before you run out of pins.

In a display, a camera, and a few sensors on a single board, those extra pins aren't an added luxury; they're a necessity.

• ESP32-C3 peripherals: SPI, I2C, I2S, UART, PWM, ADC, and Temperature sensor.
• ESP32-S3 peripherals: All C3 peripherals plus additional bus instances and SD/MMC host, capacitive touch with 14 pins, and camera and LCD interfaces.

USB Support (Serial/JTAG vs Native USB-OTG): ESP32-C3 vs ESP32-S3

Figure: ESP32-c3 and ESP32-s3 USB port

One of the largest real-life discrepancies: let's get specific.

The ESP32-C3 has a USB Serial/JTAG controller, which is great for flashing and debugging, but is not a full USB-OTG peripheral. The ESP32-S3 supports natively USB-OTG Host/Device. The C3 can be presented to a PC as a serial port for programming and logging, and that's it.

The S3 can show up as a USB keyboard, mouse, MIDI device, or mass-storage drive and can also serve as a USB host talking to other USB devices. If your product is designed to be a USB gadget or you need to read a USB device from your product, then the S3 is the chip you should use.

So the C3 does "have" USB, but only for serial and JTAG. Full USB-OTG is a feature of S3.

Wi-Fi and Bluetooth Comparison: ESP32-C3 vs S3

The wireless capability is the same for both the ESP32-C3 and the ESP32-S3, which is 2.4 GHz Wi-Fi 4 (802.11 b/g/n) and Bluetooth Low Energy 5.0.

The Wi-Fi connectivity of the S3 is referred to as "dual-band" or "5 GHz" in some articles, but that is incorrect. None of the chips support dual-band WiFi. Both radios support BLE 5.0 with Coded PHY (Long Range) and 2 Mbps PHY (High Throughput).

So there is no real difference in connectivity, and it shouldn't be a deciding point between the two.

AI, Camera, and LCD Support: ESP32-C3 vs ESP32-S3

There is no other category that the S3 can't sweep. To support neural-network math, the ESP32-S3 adds 128-bit SIMD vector instructions, thanks to Espressif's ESP-DSP and ESP-NN libraries, and adds a DVP camera interface and LCD and RGB display interfaces. None of these are available in the ESP32-C3. This is why wake-word voice assistants, person-detection cameras, gesture recognition, and smart displays include the S3.

In theory, the C3 can be used for small classifiers, but it's not a good fit for actual multimedia AI without the vector acceleration, PSRAM, or camera interface.

• On-device AI: S3 only, via vector instructions and ESP-NN.
• Camera input (DVP): S3 only.
• LCD and RGB display output: S3 only.
• Simple sensor logic and rules: both handle this comfortably.

If your product sees, hears, or shows, choose the S3. If it just senses and reports, the C3 is enough.

Power Consumption and Battery Life: ESP32-C3 vs S3

For battery-first designs, the ESP32-C3 has the edge. Its single small RISC-V core draws less active current than the S3's dual cores, and deep-sleep current sits around 5 µA versus roughly 7 µA on the S3. Over months on a coin cell or a small lithium cell, that gap and the C3's lower active draw add up.

The S3 is not power-hungry by general standards, but two 240 MHz cores plus PSRAM will always consume more than one 160 MHz core.

The trick with either chip is aggressive use of deep sleep between wake events, which is where the C3's lower baseline shines.

For a sensor that wakes once an hour and sends a reading, the C3 will outlast the S3 on the same battery. For a device that is awake and working, power draw matters less than the job getting done, which favors the S3.

Price and Cost Considerations: ESP32-C3 vs ESP32-S3

As expected, higher-performance ESP32 variants generally come with a higher cost. ESP32-C3 modules are typically available at a lower price point, while ESP32-S3 modules usually cost more depending on memory configuration, onboard flash, and PSRAM options.

The price of the bare ESP32 SoC varies by supplier, package type, and order volume, while modules include additional costs for memory, PCB design, RF components, and manufacturing. A few dollars may seem insignificant at prototype quantities, but the difference becomes meaningful in high-volume production.

For applications such as large-scale sensor nodes that do not require features like camera interfaces, AI acceleration, or USB OTG, the ESP32-C3 can provide a cost-effective solution while still delivering sufficient performance for many IoT applications.

If a design requires more advanced capabilities, such as camera support, AI-related processing, or additional peripherals, the higher cost of the ESP32-S3 may be justified by its expanded feature set.

When selecting ESP32 modules for production designs, engineers can check component availability and pricing through JLCPCB's Parts Library to simplify BOM management and streamline the sourcing process.

ESP32-C3 vs ESP32-S3: Which One Should You Choose?

Figure: ESP32-c3 vs ESP32-s3 Selection

Choose the ESP32-C3 If:

• You're developing battery-powered sensors that must work for months.
• Your project is a BLE beacon, simple connected control, or smart plug.
• Volume is key and you're trying to keep costs per unit down.
• You're upgrading an ESP8266 design and you need BLE as well as modern security.
• No camera, on-device AI, display, or USB-OTG required.

Choose the ESP32-S3 If:

• You have a camera in your device, such as a doorbell, monitor, or scanner.
• You are using on-device AI, like wake-word or person detection.
• A color LCD, RGB display, or touchscreen HMI is required.
• Your product needs to be a USB "Host" or a USB Device (keyboard or mass storage).
• Dual-core headroom is needed to run heavy tasks in parallel.

ESP32-C3 and ESP32-S3 in PCB Design: Footprint and Manufacturing

The ESP32-C3-MINI-1 is a compact module with a smaller pin count, while the ESP32-S3-WROOM-1 is larger and denser to route out its 45 GPIO.

If you plan to swap chips mid-project, be aware that the modules are not pin-compatible, so a redesign of the footprint is required.

Figure: ESP32-c3 and ESP32-s3 Boards

A few PCB-design rules apply to both, and a couple are S3-specific:

• Antenna keep-out: leave the module's antenna zone free of copper, ground pour, traces, and metal on all layers, and push it to the board edge. This is the single most common cause of poor Wi-Fi range.
• Solid ground under the module: keep a continuous ground plane beneath the RF section, stitched with vias, to keep the reference clean.
• Decoupling: place bulk and high-frequency capacitors close to the 3V3 pins, since the RF transmit current spikes hard.
• PSRAM routing (S3 only): Octal PSRAM runs fast, so keep those traces short, length-matched, and referenced to ground. This is a real layout task on the S3 that simply does not exist on the C3.
• USB routing (S3 only): route the USB D+ and D- pair as a 90 Ω differential pair for reliable USB-OTG.

On the manufacturing side, both modules are standard surface-mount parts that reflow cleanly, but the denser S3 layout leaves less margin for error in stencil design and placement. Getting a Class 2 board with a proper solder-mask-defined land pattern and controlled impedance matters more on the S3.

From ESP32 Design to Assembled PCB

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Conclusion: Picking the Right ESP32 for Your Project

Once you remove all the spec sheets, it's really easy to choose between ESP32-c3 and ESP32-s3. The C3 is an efficient and inexpensive workhorse for battery-powered and connected sensors. It's a powerful dual-core camera, display, AI and USB platform called the S3. They have a 2.4 GHz Wi-Fi 4 and BLE 5.0 radio, so connectivity isn't the deciding factor.

So, sense and report points to the C3 and see, hear, and show points to the S3, and you'll do pretty well.

With the ESP32 family continuing to grow with new parts such as the ESP32-C6 and ESP32-P4, the "lean versus capable" dichotomy will only become more pronounced, and being able to know where to use which chip will accelerate future decisions.

Once you're ready to make that decision a reality, the journey from EasyEDA schematic to a fully assembled board is a short one.

FAQs about ESP32-S3 and ESP32-C3