Which Espressif Systems module should you choose for your Wi-Fi needs? A comprehensive guide for design teams, engineers, and project managers
What you need to know before choosing an Espressif Wi-Fi module
Choosing a Wi-Fi module is a strategic decision that directly impacts product stability, certification costs, power consumption, device lifecycle and the ability to scale the project. This is why it is so important to consciously match the right ESP32 series to a specific application. It is also worth noting that the entire current Espressif family – from the C series, through the S series, to the E22 modules – originates from the original, classic ESP32. This highly versatile chip set the standard for Wi-Fi and Bluetooth communication in IoT. Today, its proven technology is reflected in subsequent generations, but each of them has been specialized for different applications.
In the previous article, you could learn more about the capabilities and limitations of Wi-Fi technology, as well as the stability and speed of individual versions of this standard.
Choosing Wi-Fi technology for industrial controllers: standards, differences, and practical applications
This article shows how to select the right Espressif module based on the radio environment, transmission characteristics, power requirements and certification risks – so that design decisions are justified both technically and from a business perspective.
We will focus on specific Espressif modules, organized by series:
- C series with model groups: ESP32-C3, ESP32-C5, ESP32-C6, ESP32-C61
- S series, specifically models from the ESP32-S3 group and the new ESP32-S31
- E series, namely ESP32-E22 supported by the Wi-Fi 6E standard
Why does choosing an Espressif Wi-Fi module matter?
In projects entering the so-called hyperconnectivity space, the Wi-Fi module is no longer just a component – it is a design decision with long-term consequences: from product stability, through its power consumption, to the lifecycle of the entire platform.
Explore the Espressif module family
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Espressif modules – key advantages for IoT projects
Wi-Fi and Wi-Fi + Bluetooth modules from Espressif have for years formed the foundation of IoT solutions in automation, consumer electronics and embedded systems. They combine transmission stability with high performance, making them suitable both for devices operating 24/7 and for projects requiring low power consumption. Their advantage lies not only in the high quality of the radio stack and support for modern Wi-Fi standards, but also in a consistent, modular platform based on the ESP-IDF environment. It ensures long-term availability of solutions, flexible selection of memory and antenna configurations, and native support for Bluetooth Low Energy, which facilitates the design of hybrid applications and safe migration between successive module generations.
For designers, this means design flexibility and freedom in selecting hardware architecture, and for procurement departments – supply stability and a predictable lifecycle of components. Regardless of the series, Espressif delivers a complete IoT platform that evolves together with the product and facilitates long-term device maintenance.
1. ESP32-C series – when performance, low complexity and cost optimization are key
| ESP32-C3 | ESP32-C61 | ESP32-C6 | ESP32-C5 | |
|---|---|---|---|---|
| Wi-Fi generation | 802.11b/g/n | 802.11b/g/n/ax | 802.11b/g/n/ax | 802.11a/b/g/n/ac/ax |
| Data rate | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps |
| Dual band | - | - | - | ✓ |
| Wi-Fi 6 | - | ✓ | ✓ | ✓ |
| Bluetooth Low Energy | 5.0 | 5.0 | 5.3 | 5.3 |
| Thread and Zigbee | - | - | ✓ | ✓ |
| Frequency range | 2.4 GHz | 2.4 GHz | 2.4 GHz | 2.4 GHz; 5 GHz |
The ESP32-C family is the foundation of many compact IoT devices. These chips are designed for simple but reliable applications operating mainly in the 2.4 GHz band, using energy-efficient RISC-V cores and Wi-Fi and Bluetooth Low Energy connectivity. Compared to more advanced lines (ESP32-S3), the C series focuses on cost efficiency, power efficiency and communication of moderate intensity – ideal for telemetry systems, sensors, building automation, small controllers or devices designed to operate for long periods on battery power.
Which devices is the ESP32-C series best suited for?
Regardless of the variant, the ESP32-C series performs very well in IoT applications that require stable and energy-efficient wireless communication.
It is an ideal solution for devices that:
- operate in the 2.4 GHz band only (optionally 5 GHz in the case of ESP32-C5)
- transmit small amounts of data, such as telemetry, periodic readings or alarm states
- are designed for long battery operation, especially in applications based on cyclic wake-up and sleep modes
- have a compact design or limited installation space
- operate in technical environments such as control cabinets, boiler rooms or automation systems where stable communication is essential
- require an integrated chip that can act both as the main microcontroller and as the wireless communication module
The ESP32-C series is particularly well suited for smart home solutions, industrial automation, measurement devices and a wide range of IoT applications.
Summary of the Espressif ESP32-C module series
ESP32-C chips can be treated as a group specialized for efficient, stable and energy-efficient IoT systems, in which communication is regular but not intensive, and reliability of connectivity in the 2.4 GHz band is the top priority. The C3 and C61 versions are suitable where simplicity and cost optimization are key, while the C5 and C6 enable more demanding solutions (5 GHz band in ESP32-C5) or integration with modern smart device ecosystems (additional IEEE 802.15.4 support in ESP32-C6).
Explore detailed specifications of selected Espressif Systems ESP32-C models
2. ESP32 S3 – a choice for projects requiring greater performance, multimedia and advanced functionality
The ESP32-S3 family was designed for projects in which the Wi-Fi module serves not only as a communication channel, but also as a local processing unit. It is the right choice for devices requiring significantly more performance than the ESP32-C series – especially where AI algorithms, image processing, display handling, HMI interfaces and extensive peripherals are needed.
The technical parameters make this module a platform capable of handling more complex multimedia and computational tasks. Built-in vector instructions in Espressif chips enable efficient DSP and AI processing. Their capabilities are utilized by ESP-DSP and ESP-NN libraries as well as higher-level solutions such as ESP-WHO and ESP-Skainet.
ESP32-S3 operates in the 2.4 GHz Wi-Fi 802.11 b/g/n standard and Bluetooth 5 (LE) with coded PHY and 2 Mbps, ensuring long range and stable operation even at elevated temperatures. The S3 series addresses the needs of designs that require a high level of hardware integration.
In terms of security, ESP32-S3 offers features typically found in more expensive MCUs.
With full support for the ESP-IDF environment, rigorous testing and backward compatibility with previous Espressif platforms, S3 is a natural evolution for projects that require greater performance, security and flexibility without significantly increasing costs.
When should you choose ESP32-S3 modules?
ESP32-S3 is best suited for devices that:
- must process data locally – AI, neural networks, image, audio and signal analysis
- combine communication with multimedia logic – HMI panels, user interfaces, displays
- require intensive peripheral operation – numerous GPIOs, sensors, external memory
- must communicate simultaneously via Wi-Fi and BLE
- are intended as highly integrated and secure platforms (industrial and consumer IoT)
ESP32-S3 is a module for projects in which Wi-Fi alone is not enough – the device must also be computationally powerful, hardware-flexible and secured at the system level.
Explore detailed specifications of selected Espressif Systems ESP32-S3 models:
ESP32-S31 – series extension
It is also worth noting that the direction of this platform is being further developed by the new ESP32-S31, which extends the capabilities of the series with Wi-Fi 6, Bluetooth 5.4, IEEE 802.15.4 and Ethernet MAC, as well as a more powerful RISC-V architecture with SIMD and a more advanced memory and peripheral subsystem. This is a chip designed for even more advanced HMI devices, edge AI and integrated IoT systems, in which wireless communication is no longer the only selection criterion.
| ESP32-S31 | ESP32-S3 | |
|---|---|---|
| CPU | Dual-core, 32-bit RISC-V | Dual-core Xtensa LX7 |
| Max clock | up to 320 MHz | up to 240 MHz |
| SRAM | 512 KB | 512 KB |
| Wi-Fi connectivity | Wi-Fi 6 - 2.4 GHz | Wi-Fi 4 - 2.4 GHz |
| Bluetooth | BLE 5.4 + Classic | BLE 5 |
| IEEE 802.15.4 | Yes | No |
| Ethernet MAC | Yes, 1000 Mb/s | No |
| GPIO | 61 | 45 |
Learn more about ESP32-S31:
3. ESP32-E22 – a next-generation tri-band Wi-Fi 6E module for high throughput and ultra stability
The introduction of ESP32-E22 marks Espressif’s entry into the tri-band Wi-Fi 6E segment. This is an important step toward applications requiring higher throughput, lower latency and better performance in environments with a high density of devices. ESP32-E22 supports the 2.4 GHz, 5 GHz and 6 GHz bands, and thanks to support for 160 MHz channels, 2×2 MU-MIMO, beamforming and 1024-QAM modulation, it can achieve throughput of up to 2.4 Gb/s. However, it should be noted that this chip is positioned by Espressif as a communication co-processor for host-based systems, intended for high-performance wireless architectures rather than as a typical Wi-Fi microcontroller for simple IoT devices.
For design teams, this means the ability to deploy devices in high-density RF environments, such as modern warehouses, production halls with AGV systems, vision systems or consumer equipment in which full utilization of available bandwidth is critical for smooth operation.
An important distinguishing feature of ESP32-E22 is its radio co-processor (RCP) architecture, which takes over full management of communication stacks, roaming, security and transmission optimization. This allows the wireless communication layer to be separated into a dedicated chip, while application logic remains on an external host processor. This approach is particularly relevant in projects where the connectivity layer must be managed independently of the device’s main function.
The new architecture supporting Bluetooth Low Energy 5.4 and Bluetooth Classic further expands integration possibilities with both legacy and modern devices, making ESP32-E22 a natural candidate for smart home projects, IoT hubs and AR/VR systems, where response time and transmission stability are critical.
When should you choose ESP32-E22 (Wi-Fi 6E)?
The ESP32-E22 should be selected when the device needs to support:
- operation in three bands (2.4 / 5 / 6 GHz)
- very high throughput (up to 2.4 Gb/s)
- ultra-low communication latency
- reliable operation in crowded industrial environments and warehouses
- stable roaming and operation in environments with multiple access points
- integration with vision systems, AR/VR and edge computing
This is a premium-class module intended for next-generation applications such as AGV systems, vision systems, intelligent gateways, high-end consumer devices and modern industrial automation.
Learn more about ESP32-E22:
Design decision: how to select an Espressif module for device requirements
The right choice of an Espressif module is never reduced to a simple comparison of Wi-Fi standards. It is a decision about which communication architecture will form the foundation of the device over the coming years of its lifecycle.
If the device is intended to operate in conditions with limited signal propagation – especially in technical rooms, metal enclosures, control cabinets or boiler rooms – a natural choice will be a module operating in the 2.4 GHz band, offering high stability and performance, such as the ESP32-C or ESP32-S series (depending on processing requirements).
If the priority is predictable operation in an environment with a high density of devices, where the key challenge is handling spectrum congestion, it is worth choosing modules based on Wi-Fi 6, which provide improved transmission stability, reduced latency and more efficient use of the wireless medium.
On the other hand, when the project requires very high throughput, real-time operation, synchronization of multiple data streams or integration with next-generation technologies, the ESP32-E22 module becomes a natural choice – not only because of its tri-band Wi-Fi 6E capabilities, but above all due to its co-processor architecture, which offloads the main processor of the device.
It is worth viewing this choice not simply as “selecting a module”, but as defining the long-term direction of the entire device platform.
Summary
The Espressif Systems module family offers a complete spectrum of solutions for all IoT segments – from energy-efficient ESP32-C modules, through advanced ESP32-S chips, to the tri-band ESP32-E22 with Wi-Fi 6E. The selection of the appropriate module therefore depends on the actual requirements of the project, the installation environment, the expected performance and the planned development direction of the product.
Thanks to a broad portfolio, long-term availability and high standards of integration and security, Espressif remains one of the most reliable communication platforms in the IoT ecosystem – for both engineers and designers, as well as for managers responsible for technology strategy, cost optimization and long-term product reliability.
| Espressif Wi-Fi modules | Conclusions / features |
|---|---|
| ESP32-C3 / -C61 |
Cost, performance and simplicity are the key factors Minimal procurement risk |
| ESP32-C6 / -C5 |
Transition from “classic IoT” to modern ecosystems Wi-Fi 6, mesh, Thread, Zigbee Improved stability in congested environments |
| ESP32-S3 / S31 |
Wi-Fi becomes secondary to processing capabilities Local processing, HMI, AI Reduced number of components on the PCB |
| ESP32-E22 |
A fundamentally different design class: no application MCU Very high cost Maximum stability and throughput |