Before the ESP32: the problem it solved
In the early 2010s, putting a hobby project or a low-volume product on a Wi-Fi network was disproportionately expensive. The microcontroller might cost two dollars; the Wi-Fi module bolted onto it cost twenty or thirty, needed its own certification, and usually spoke a proprietary AT-command protocol over a serial link. Wi-Fi was something you added to a design, not something that came with it.
Espressif’s insight was that this separation was an artefact of the industry’s structure rather than a technical necessity. If you designed the radio and the processor together, on the same die, and sold the result as a commodity, the price collapsed.
Espressif Systems
Espressif Systems was founded in April 2008, with its headquarters in the ZhangJiang Hi-Tech Park in Shanghai. Its founder, Teo Swee Ann, is a Singaporean electrical engineer who graduated from the National University of Singapore and had previously worked as an engineering director at Montage Technology.
The company was, and remains, fabless — it designs chips and has them manufactured by third-party foundries. It opened its first mainland R&D office in Wuxi in March 2010, added branches in Suzhou and Hefei, and later established research centres in Czechia, Singapore, Brazil and India. It has been ISO 9001 certified since April 2015.
For its first six years the company was essentially unknown outside a narrow circle of Chinese consumer-electronics manufacturers. That changed with one part.
The ESP8266 breakthrough
The ESP8266 appeared in May 2014. On paper it was modest: a single Tensilica L106 core at up to 160 MHz, 160 KB of usable RAM, and 2.4 GHz 802.11 b/g/n. What made it remarkable was that complete modules built around it — with the crystal, the antenna, the flash and regulatory certification already handled — sold for a few dollars.
The chip was not originally aimed at Western developers. Its documentation was sparse and initially Chinese-only, and it reached the maker community largely by accident, through cheap serial Wi-Fi modules sold on marketplaces. What followed was a genuine grassroots reverse-engineering effort: an independent SDK, an Arduino core, a MicroPython port and NodeMCU firmware all emerged from the community, in some cases ahead of official support.
Espressif made a consequential strategic choice at this point: rather than treating the unofficial ecosystem as a nuisance, it leaned into open source. Its SDK, and later ESP-IDF, went onto GitHub under permissive licences. That decision is arguably as responsible for the company’s position today as any piece of silicon design.
September 2016: the ESP32
The ESP32 launched in September 2016 as the ESP8266’s successor, and it was a substantial step up rather than an increment:
- Two Xtensa LX6 cores at up to 240 MHz instead of one core at 160 MHz
- 520 KB of SRAM instead of 160 KB
- Bluetooth 4.2, both Classic and Low Energy, alongside Wi-Fi
- An Ethernet MAC, a CAN controller, capacitive touch sensing, two DACs, an 18-channel ADC
- An ultra-low-power co-processor that keeps running while the main cores sleep
- Hardware AES, SHA, RSA and a true random number generator, plus secure boot and flash encryption
Crucially, it kept the price structure. A chip cost a couple of dollars; a certified module cost under four; a development board cost under ten. The ESP32 became the default answer to “how do I get this thing on the network?” for makers, and increasingly for commercial products too — smart plugs, bulbs, thermostats, air-conditioner controllers and industrial sensors shipped in enormous volumes built around ESP32 modules.
The company listed on the Shanghai Stock Exchange’s STAR Market on 22 July 2019 under the ticker 688018, raising roughly 1.2 billion yuan. By around 2020 it had shipped its hundred-millionth IoT chip; in October 2023 it announced that cumulative shipments had passed one billion since the ESP8266.
The great diversification
From 2019 onward, the strategy changed. Instead of one general-purpose flagship, Espressif began splitting the family into lines aimed at specific trade-offs. Three changes drove this:
1. RISC-V. Xtensa is a licensed, proprietary instruction set. Every chip released after the S3 — the entire C, H, P and E series, and now the S31 — uses RISC-V instead. This removed a licensing dependency, simplified the toolchain story and let Espressif put small low-power RISC-V cores alongside the main processors as coprocessors.
2. Matter, Thread and Zigbee. The smart-home industry converged on Matter, which runs over Wi-Fi and over Thread. Thread needs an 802.15.4 radio, which the original ESP32 does not have. The C6, C5, H2, H21, H4 and S31 all added one.
3. Wi-Fi 6. Not for raw speed — IoT devices do not need gigabits — but for Target Wake Time, which lets a battery-powered device negotiate sleep windows with the access point, and for OFDMA, which behaves far better in the congested networks where these devices actually live.
The result is the current arrangement: an S-series for general-purpose and multimedia work, a cost-optimised C-series, an H-series that drops Wi-Fi for ultra-low-power mesh, a P-series that drops the radio for raw performance, and an E-series that is a radio without a microcontroller.
Timeline
- 2008
Espressif Systems founded
Headquarters established in ZhangJiang Hi-Tech Park, Shanghai, in April, by Teo Swee Ann.
- 2010
First mainland R&D office
A branch opens in Wuxi in March — the company’s first dedicated research office outside Shanghai.
- 2014
ESP8266 ships
A single-core Wi-Fi SoC at a price that had no precedent. It reaches Western developers largely through unofficial channels and triggers a community reverse-engineering effort.
- 2015
ISO 9001 certification
Formal quality-management certification in April, as the company begins selling into commercial rather than purely hobbyist volumes.
- 2016
ESP32 launches
September. Dual Xtensa LX6 cores at 240 MHz, 520 KB SRAM, Wi-Fi plus Bluetooth Classic and LE, Ethernet MAC, CAN, touch sensing and hardware crypto.
- 2019
STAR Market listing
Espressif goes public on the Shanghai Stock Exchange’s STAR Market on 22 July as ticker 688018, raising about 1.2 billion yuan. The ESP32-S2 is announced the same year.
- 2020
One hundred million chips — and the RISC-V pivot
The hundred-millionth IoT chip ships. The ESP32-C3, Espressif’s first RISC-V part, and the ESP32-S3 with its SIMD vector extensions are both announced.
- 2021
802.15.4 arrives
The ESP32-H2 (Thread and Zigbee, no Wi-Fi) and the ESP32-C6 (Wi-Fi 6 plus 802.15.4) are announced, positioning the family for Matter.
- 2022
ESP32-C2 and the 5 GHz announcement
The minimalist C2 ships as a cost floor. The ESP32-C5, the first dual-band part, is announced — though it will take three years to reach volume.
- 2023
One billion chips shipped
Announced in October. The ESP32-C6 enters production, and Espressif ships a one-stop Matter solution.
- 2024
ESP32-P4 revealed
January. A 400 MHz dual-core RISC-V part with MIPI-DSI and CSI, an image signal processor and a hardware H.264 encoder — and deliberately no radio at all. The ESP32-H4 is announced in September.
- 2025
Dual-band, at last
The ESP32-C5 reaches mass production in May — the first RISC-V SoC with dual-band Wi-Fi 6, BLE 5 and 802.15.4 in one part. The ESP32-P4 and the budget Wi-Fi 6 ESP32-C61 also enter production.
- 2026
A radio co-processor, and the S-series goes RISC-V
January: the ESP32-E22, a tri-band Wi-Fi 6E and dual-mode Bluetooth radio co-processor for Linux hosts — the first Espressif part that is not a standalone microcontroller. It is Wi-Fi 6E certified in June. March: ESP-IDF v6.0, and preview support for the ultra-low-power ESP32-H21. July: the ESP32-S31 enters mass production, moving the S-series to RISC-V and combining Wi-Fi 6, Bluetooth 5.4, 802.15.4 and gigabit Ethernet in a single chip.
What the history tells you about choosing a part
Two practical lessons fall out of this trajectory.
Newer is not automatically better. The original ESP32 is a decade old and outclassed on paper by almost everything since, but it has the deepest pool of example code, the widest board availability and the only Bluetooth Classic radio in the family. The C3 is five years old and remains one of the best value-for-effort choices precisely because it is boring and thoroughly documented.
Availability lags announcement, sometimes by years. The C5 was announced in 2022 and reached volume production in 2025. If a part matters to your schedule, check its actual production status — the variants pages flag this for every chip — rather than the date of the press release.