Short name	ESP32-C3-WROOM-02U	ESP32-C3	ESP32-S2	ESP32	ESP8285	ESP8266
Description		ESP32-C3 is pin-compatible with ESP8266. It has a single core RISC-V 32-bit CPU @160 MHz and includes 400 kB of SRAM and 384 kB of flash built-in.			The ESP8285 is similar to the ESP8266, but has built-in 1 MiB of flash.
Website	espressif.com/...	espressif.com/...	espressif.com/...	espressif.com/...	espressif.com/...	espressif.com/...
Release date	2021	2020	2019	2016	2016	2014
Product details
CPU	32-bit RISC-V single-core processor	RISC-V 32-bit Single-Core @ 160 MHz	Tensilica Xtensa LX7 32 bit Single-Core @ 240Mhz	Tensilica Xtensa LX6 32 bit Dual-Core @ 160 / 240Mhz	Tensilica LX106 32 bit @ 80 MHz (up to 160 MHz)	Tensilica LX106 32 bit @ 80 MHz (up to 160 MHz)
Coprocessor			ULP (RISC-V)	ULP
RAM		400 KB	320 KB	520 KB	160 KB	50 KB less than
ROM (Flash)		384 KB	128 KB	448 KB	1,024 KB	0 use external SPI flash
UART	2	2	2	3	2	2
SPI	Yes 3	Yes 3	Yes 4 (OSPI)	Yes 4	Yes 2	Yes 2
Wi-Fi	Yes 802.11b/g/n	Yes 802.11b/g/n	Yes 802.11b/g/n	Yes 802.11b/g/n	Yes 802.11b/g/n (max 65Mbps)	Yes 802.11b/g/n (max 65Mbps)
Bluetooth®	Yes 5.0 BLE	Yes 5.0 + BLE	No	Yes 4.2 BR/EDR + BLE	No	No
USB Host		No	Yes	No	No	No
Ethernet (LAN, RJ45)		No	No	Yes 10/100Mbps	No	No
RTC Memory	8 KB	8 KB	16 KB	16 KB
External SRAM			128 MB up to	8 MB up to	16 MB up to
External Flash			1 GB up to	16 MB up to		16 MB up to
ESP-MESH		Yes	Yes	Yes	Yes	Yes
CAN				Yes v2.0		No
GPIO	15 (up to)	22 (up to)	43	34	17 (up to)	17 (up to)
Hall effect sensor	No	No	No	Yes	No	No
Temperature sensor	Yes	Yes	Yes	Yes	No	No
Touch sensors	No		14	10	No	No
I²C	Yes up to 1	Yes up to 1	Yes up to 2	Yes up to 2	Yes up to 1	Yes up to 1
I2S	1	1	1	2	2	2
ADC	Yes 2 × 12-bit ADC, up to 6 channels	Yes 2 × 12-bit SAR ADCs, up to 6 channels	Yes 12 bit SAR ADC up to 20 channels	Yes 12 bit SAR ADC up to 18 channels	Yes 10 bit	Yes 10 bit
DAC	No		Yes 8 bit up to 2 channels	Yes 8 bit up to 2 channels	No	No
PWM		Yes up to 6	Yes 8	Yes up to 8	No	Yes 4
SDMMC			No	Yes	No	No
RMT (remote control)			Yes	Yes	No	No
LCD Interface		No	Yes	No	No	No
Camera Interface	No	No	Yes	No	No	No
Secure flash		4096-bit OTP	4096-bit OTP secure boot	1024-bit OTP secure boot
Cryptography support		AES-128/256, RSA Accelerator, SHA Accelerator, Random Number Generator (RNG), HMAC	AES-128/192/256, SHA-2, RSA, RNG, HMAC, Digital Signature	AES, SHA-2, RSA, ECC, RNG
Deep sleep consumption	5 µA		5 µA	10 µA, Yes	20 µA	20 µA, Yes
Dimensions
Height	18 mm	5 mm	7 mm	6 mm	5 mm	5 mm
Width	20 mm	5 mm	7 mm	6 mm	5 mm	5 mm