ESP8266EX
Every spec below is cited to the manufacturer datasheet. Pick your exact ordering code, compare the closest alternatives, then ask the assistant what it means for your design.
What the ESP8266EX family does
The ESP8266x family, including the ESP8266EX and ESP8684, are Wi-Fi microcontrollers featuring an integrated Tensilica processor. These devices operate on a single supply of 2.5 to 3.6 V and support a crystal frequency range of 24 to 52 MHz. The chip provides a maximum transmit power of 20 dBm and includes built-in Bluetooth Low Energy capabilities in later revisions. Engineers typically use these components for smart home devices, IoT sensors, and wireless control systems where low power consumption and compact integration are critical requirements.
ESP8266EX datasheet parameters
| Parameter | Min | Typ | Max | Conditions | Source |
|---|---|---|---|---|---|
| supply voltage range | 2.5 V | — | 3.6 V | Espressif datasheet, p. 25 — 表 5-1. 电气特性 | |
| operating temperature | -40 °C | — | 125 °C | 电气特性 | Espressif datasheet, p. 25 — 表 5-1. 电气特性 |
| clock frequency | 24 MHz | — | 52 MHz | External crystal (FXO), high-frequency clock | Espressif datasheet, p. 14 — 表 3-1. 高频时钟参数 |
| cpu speed | — | 160 MHz | — | Maximum CPU clock speed | Espressif datasheet, p. 13 |
| program memory size | — | 15.3 MB | — | External SPI flash, theoretical maximum | Espressif datasheet, p. 14 |
| ram size | — | 48.8 KB | — | Station mode, user-available SRAM in Heap + Data | Espressif datasheet, p. 13 |
| io count | — | 17 | — | Espressif datasheet, p. 19 | |
| adc resolution | — | 10 bit | — | SAR ADC | Espressif datasheet, p. 23 |
| core size | — | 32 bit | — | Tensilica L106 processor | Espressif datasheet, p. 13 |
ESP8266EX frequently asked questions
What is the ADC resolution of the ESP8266EX?
The ADC resolution is 10 bit for the SAR ADC.
What is the clock frequency when using an external crystal (FXO) for the high-frequency clock?
The clock frequency is 52 MHz.
What is the core size of the ESP8266EX?
The core size is 32 bit for the Tensilica L106 processor.
What is the maximum CPU clock speed of the ESP8266EX?
The maximum CPU clock speed is 160 MHz.
What is the I/O count for the ESP8266EX?
The I/O count is 17.
What is the maximum operating temperature specified in the electrical characteristics?
The maximum operating temperature is 125 °C.
What is the maximum theoretical program memory size supported by the ESP8266EX when using external SPI flash?
The maximum theoretical program memory size is 15.3 MB.
What is the user-available SRAM size in Station mode?
The user-available SRAM in Heap + Data is 48.8 KB in Station mode.
What is the supply voltage range for the ESP8266EX?
The supply voltage range is 3.6 V.
ESP8684 datasheet parameters
| Parameter | Min | Typ | Max | Conditions | Source |
|---|---|---|---|---|---|
| operating temperature | -40 °C | — | 125 °C | 电气特性 | Espressif datasheet, p. 25 — 表 5-1. 电气特性 |