Most product creators pick the ESP32-S3 by default because it's familiar, and then six months into development they realize it can't do what their product actually needs.
The ESP32 lineup has exploded to over nine different variants, but three of them matter most for new product designs right now: the S3, the C6, and the P4.
Each one targets a completely different type of product, and confusing them is one of the most expensive early mistakes you can make.
So I'm going to break down exactly who each chip is for, where each one falls short, and which one you should actually be designing around.
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Before getting into those three chips, let me quickly explain why I'm not covering the other ESP32 variants separately.
The original ESP32 still works and still ships in products, but its Xtensa architecture and WiFi 4 are starting to show their age.
The C2 and C3 are solid RISC-V chips for cost-sensitive IoT like smart plugs and basic sensors, but they're not where the interesting design decisions happen.
The H2 and H4 have no WiFi at all, they're specialist Thread and Zigbee endpoint chips.
The C5 and C6 are part of the same family, so I'll cover them together.
So the S3, C6, and P4 are the three that represent completely distinct architectures: the proven all-rounder, the future-proof connected device, and the high-performance compute platform.
The ESP32-S3
The ESP32-S3 is the all-rounder that most product creators default to, and for good reason.
It's a dual-core processor running at 240 MHz with WiFi 4, Bluetooth Low Energy, and native USB built in, plus up to 45 GPIO pins for connecting sensors and peripherals.
The ecosystem is the biggest advantage here, with more libraries, community support, third-party boards, and module availability than anything else in the ESP32 family.
Native USB means you don't need a separate converter chip on your board, which reduces your parts count and makes firmware updates in production easier.
Dual-core processing lets you handle WiFi and sensor tasks at the same time without one blocking the other, and pre-certified WROOM and MINI modules make FCC and CE certification much more manageable.
That combination makes the S3 a strong fit for consumer electronics, wearables with displays, audio products, and camera-based devices at moderate resolution.
But the S3 has real limitations you need to know about.
It's WiFi 4 only, with no WiFi 6, no Thread, and no Zigbee.
It can run Matter natively over WiFi, but if your product requires Thread connectivity, you'll need a companion chip.
It's also built on Espressif's older Xtensa architecture, and everything new they're releasing uses RISC-V instead, which likely makes the S3 the last major Xtensa chip in the lineup.
Its low-power co-processor is also pretty limited compared to the C6, so if your product needs to handle complex background tasks like continuous sensor polling while the main processor sleeps, you're going to burn more battery.
So the S3 is your best pick when you need reliable WiFi plus Bluetooth today, moderate processing power, and the most mature ecosystem with the least friction getting to production.
The ESP32-C6
The ESP32-C6 is the chip designed for where smart home and IoT are heading.
It runs a single RISC-V core at 160 MHz paired with a dedicated low-power core at 20 MHz that handles background housekeeping while the main processor sleeps.
But the real headline is the wireless stack: WiFi 6, Bluetooth Low Energy, plus Thread and Zigbee support, all in one chip.
That combination is exactly what the Matter smart home standard was built around, and the C6 and C5 are the only chips in the ESP32 family that deliver all of it natively.
WiFi 6 isn't just about raw speed for IoT products either.
It includes a feature called Target Wake Time that lets the chip negotiate exact wake-up schedules with your router, which translates to real battery life improvements for products that only transmit data periodically.
WiFi 6 also handles crowded networks much better, so in a home with dozens of connected devices competing for bandwidth, your product won't choke.
The dedicated low-power core handles sensor polling and BLE advertising while the main core is off, something the S3 simply can't do.
And because it's RISC-V, it lines up with Espressif's long-term direction for toolchains, documentation, and community investment.
The C6 does fall short on raw processing power, since a single core at 160 MHz gives you noticeably less headroom than the S3's dual-core 240 MHz.
It's not the chip for display rendering, AI inference, or heavy compute.
The ecosystem is also smaller than the S3's right now, with fewer libraries, examples, and third-party resources, though it's catching up fast.
No USB OTG, meaning it can't act as a USB host or emulate custom USB devices, and no hardware floating point unit either, so keep those in mind if your design depends on them.
Now, if the C6's processing speed feels limiting, that's exactly where the ESP32-C5 comes in.
The C5 shares the same wireless stack, WiFi 6, Bluetooth, Thread, and Zigbee, but bumps the main core up to 240 MHz and the low-power core up to 48 MHz.
It also adds dual-band WiFi 6 with 5 GHz support, which helps in environments where 2.4 GHz is congested.
The C5 is in mass production with modules available today, so if you need the C6's wireless architecture but with more processing headroom or 5 GHz, the C5 closes both of those gaps.
The C6 and C5 are ideal for IoT and smart home products designed around Matter, battery-powered sensors, environmental monitors, and anything where wireless protocol flexibility and power efficiency matter more than raw compute.
The ESP32-P4
The ESP32-P4 is a completely different animal. It's the most powerful...
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Talk soon,
John
P.S. If you need help navigating these chip choices for your specific product, you can get guidance from me and other experts inside the Hardware Academy.