ESP Chips

Chips

Chip	CPU	Speed	Cores	RAM	Pins	GPIOs	WiFi
ESP8266	Tensilica L106	80MHz	1	160KB	32	13	802.11n 20MHz
ESP32	Tensilica Xtensa LX6	160MHz	1 or 2	520KB	48	30	802.11n 40MHz
ESP32-S2	Tensilica Xtensa LX7	160MHz	1	320KB	56	39	802.11n 40MHz
ESP32-S3	Tensilica Xtensa LX7	160MHz	2	512KB	56	41	802.11n 40MHz
ESP32-C2	RISC-V	120MHz	1	272KB	24	17	802.11n 40MHz
ESP32-C3	RISC-V	160MHz	1	400KB	32	18	802.11n 40MHz
ESP32-C5*	RISC-V	240MHz	1	400KB	Unknown	20	802.11ax 40MHz 2.4GHz & 5GHz
ESP32-C6	RISC-V	160MHz	1	512KB	32 / 40	18 / 26	802.11ax 40MHz

• ESP32C5 chip is not available yet in the market.

Espressif SoC Overview

Official Espressif Technical Documents

Common GPIO Functions

These GPIOs are normally connected in development boards:

Chip	Boot	UART0 TX	UART0 RX	USB-	USB+
ESP8266	0	1	3
ESP32	0	1	3
ESP32-S2	0	43	44	19	20
ESP32-S3	0	43	44	19	20
ESP32-C2	9	20	19
ESP32-C3	9	21	20	18	19
ESP32-C6	9	16	17	12	13