NodeMCU ESP8266[Video+FAQ]: ESP32 vs ESP8266
TxRx + MCU 2.4GHz 2.5V~3.6V I2C, I2S, SPI, UART 54Mbps 50mA~56mA - Receiving 120mA~170mA - Transmitting 8 32-VFQFN Exposed Pad









TxRx + MCU 2.4GHz 2.5V~3.6V I2C, I2S, SPI, UART 54Mbps 50mA~56mA - Receiving 120mA~170mA - Transmitting 8 32-VFQFN Exposed Pad
The ESP8266 is a Wi-Fi SoC that integrates all the needed components to create a fully functional Wi-Fi device. This article will introduce ESP8266 systematically from its features, pinout to its specifications, applications, and so much more.

5$ Arduino WiFi Module!? ESP8266 mini Tutorial/Review
- What are ESP8266 and NodeMCU?
- ESP8266 Overview
- ESP8266 Pinout and Configurations
- Specifications
- ESP8266 CAD Models
- ESP8266 Applications
- ESP8266 Features
- ESP8266 Manufacturer
- ESP8266 Functional Block Diagram
- ESP8266 Package
- ESP8266 with Arduino IDE
- Which one is better ESP32 or ESP8266?
- Trend Analysis
- Datasheet PDF
What are ESP8266 and NodeMCU?
Most people call ESP8266 a WIFI module, but it is actually a microcontroller. ESP8266 is the name of the microcontroller developed by Espressif Systems which is a company based out of shanghai. This microcontroller has the ability to perform WIFI-related activities hence it is widely used as a WIFI module. There are many types of ESP8266 modules available ranging from ESP8266-01 to ESP8266-12.

NodeMCU is a Firmware on ESP8266. It is ESP-12 and it is basically a System on Chip (SoC). It has Lua-based firmware which is used to develop IoT-based applications.
It is easy to work on this inexpensive SoC and make our device smart. It has analog and digital pins, which we can use to interface our sensors and can get the data over the internet.
ESP8266 Overview
The NodeMCU ESP8266 development board comes with the ESP-12E module containing the ESP8266 chip having Tensilica Xtensa 32-bit LX106 RISC microprocessor. This microprocessor supports RTOS and operates at 80MHz to 160 MHz adjustable clock frequency. NodeMCU has 128 KB RAM and 4MB of Flash memory to store data and programs. Its high processing power with in-built Wi-Fi / Bluetooth and Deep Sleep Operating features make it ideal for IoT projects.
NodeMCU can be powered using a Micro USB jack and VIN pin (External Supply Pin). It supports UART, SPI, and I2C interfaces.
ESP8266 Pinout and Configurations

| Pin Category | Name | Description |
| Power | Micro-USB, 3.3V, GND, Vin | Micro-USB: NodeMCU can be powered through the USB port 3.3V: Regulated 3.3V can be supplied to this pin to power the board GND: Ground pins Vin: External Power Supply |
| Control Pins | EN, RST | The pin and the button reset the microcontroller |
| Analog Pin | A0 | Used to measure analog voltage in the range of 0-3.3V |
| GPIO Pins | GPIO1 to GPIO16 | NodeMCU has 16 general purpose input-output pins on its board |
| SPI Pins | SD1, CMD, SD0, CLK | NodeMCU has four pins available for SPI communication. |
| UART Pins | TXD0, RXD0, TXD2, RXD2 | NodeMCU has two UART interfaces, UART0 (RXD0 & TXD0) and UART1 (RXD1 & TXD1). UART1 is used to upload the firmware/program. |
| I2C Pins | NodeMCU has I2C functionality support but due to the internal functionality of these pins, you have to find which pin is I2C. |
Specifications
- TypeParameter
- Factory Lead Time4 Weeks
- Mounting Type
The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.
Surface Mount - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
32-VFQFN Exposed Pad - Packaging
Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.
Tape & Reel (TR) - Published2015
- Part Status
Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.
Active - Moisture Sensitivity Level (MSL)
Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures
3 (168 Hours) - TypeTxRx + MCU
- Max Operating Temperature
The Maximum Operating Temperature is the maximum body temperature at which the thermistor is designed to operate for extended periods of time with acceptable stability of its electrical characteristics.
125°C - Min Operating Temperature
The "Min Operating Temperature" parameter in electronic components refers to the lowest temperature at which the component is designed to operate effectively and reliably. This parameter is crucial for ensuring the proper functioning and longevity of the component, as operating below this temperature may lead to performance issues or even damage. Manufacturers specify the minimum operating temperature to provide guidance to users on the environmental conditions in which the component can safely operate. It is important to adhere to this parameter to prevent malfunctions and ensure the overall reliability of the electronic system.
-40°C - Voltage - Supply
Voltage - Supply refers to the range of voltage levels that an electronic component or circuit is designed to operate with. It indicates the minimum and maximum supply voltage that can be applied for the device to function properly. Providing supply voltages outside this range can lead to malfunction, damage, or reduced performance. This parameter is critical for ensuring compatibility between different components in a circuit.
2.5V~3.6V - Frequency
In electronic components, the parameter "Frequency" refers to the rate at which a signal oscillates or cycles within a given period of time. It is typically measured in Hertz (Hz) and represents how many times a signal completes a full cycle in one second. Frequency is a crucial aspect in electronic components as it determines the behavior and performance of various devices such as oscillators, filters, and communication systems. Understanding the frequency characteristics of components is essential for designing and analyzing electronic circuits to ensure proper functionality and compatibility with other components in a system.
2.4GHz - Protocol
In electronic components, the parameter "Protocol" refers to a set of rules and standards that govern the communication between devices. It defines the format, timing, sequencing, and error checking methods for data exchange between different components or systems. Protocols ensure that devices can understand and interpret data correctly, enabling them to communicate effectively with each other. Common examples of protocols in electronics include USB, Ethernet, SPI, I2C, and Bluetooth, each with its own specifications for data transmission. Understanding and adhering to protocols is essential for ensuring compatibility and reliable communication between electronic devices.
802.11b/g/n - Power - Output
Power Output in electronic components refers to the amount of electrical power that a device can deliver to a load. It is typically measured in watts and indicates the effectiveness of the component in converting electrical energy into usable work or signal. Power Output can vary based on the component's design, operating conditions, and intended application, making it a critical factor in the performance of amplifiers, power supplies, and other electronic devices. Understanding the Power Output helps in selecting appropriate components for specific applications to ensure efficiency and reliability.
20dBm - RF Family/Standard
The parameter "RF Family/Standard" in electronic components refers to the specific radio frequency (RF) technology or standard that the component complies with or is designed for. RF technology encompasses a wide range of frequencies used for wireless communication, such as Wi-Fi, Bluetooth, cellular networks, and more. Different RF standards dictate the frequency bands, modulation techniques, data rates, and other specifications for communication systems. Understanding the RF family/standard of a component is crucial for ensuring compatibility and optimal performance in RF applications.
WiFi - Sensitivity
Sensitivity in electronic components refers to the degree to which the output of a device responds to changes in input. It indicates how effectively a component translates a specific input signal into an observable output. High sensitivity means that even small variations in input can produce significant changes in output, making the device more responsive to signals. Sensitivity is crucial in applications where precise measurements or signal detection are required.
-91dBm - Data Rate (Max)
Data Rate (Max) refers to the maximum rate at which data can be transferred or processed within an electronic component or device. It is typically measured in bits per second (bps) or megabits per second (Mbps). This parameter is important for determining the speed and efficiency of data transmission or processing in various electronic applications such as computer systems, networking devices, and memory modules. A higher data rate indicates that the component is capable of handling larger volumes of data at a faster pace, leading to improved performance and responsiveness in electronic systems. It is crucial to consider the Data Rate (Max) specification when selecting electronic components to ensure compatibility and optimal functionality for specific applications.
54Mbps - Serial Interfaces
A serial interface is a communication interface between two digital systems that transmits data as a series of voltage pulses down a wire. Essentially, the serial interface encodes the bits of a binary number by their "temporal" location on a wire rather than their "spatial" location within a set of wires.
I2C, I2S, SPI, UART - Current - Receiving
Current - Receiving refers to the amount of electrical current that an electronic component or device is capable of accepting from a power source or another component in a circuit. It indicates the maximum current that can be safely received without causing damage or malfunction. This parameter is crucial for ensuring compatibility and reliability in electronic designs, as exceeding the rated receiving current can lead to overheating or failure of the component.
50mA~56mA - Current - Transmitting
Current - Transmitting is a parameter used to describe the maximum amount of electrical current that an electronic component can handle while in the transmitting mode. This parameter is crucial for components such as transistors, diodes, and integrated circuits that are involved in transmitting signals or power within a circuit. Exceeding the specified current transmitting rating can lead to overheating, component failure, or even damage to the entire circuit. Designers and engineers must carefully consider this parameter when selecting components to ensure the reliability and performance of the electronic system.
120mA~170mA - GPIO
GPIO stands for General Purpose Input/Output. It is a type of electronic pin found on microcontrollers, microprocessors, and other integrated circuits that can be configured to either input or output digital signals. GPIO pins can be used to connect and communicate with external devices such as sensors, LEDs, motors, and more. They provide a flexible way to interact with the physical world by allowing the device to both receive and send digital signals. GPIO pins can be programmed and controlled by software to perform various functions based on the specific requirements of the electronic system.
8 - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
RoHS Compliant
ESP8266 CAD Models
Symbol

Footprint

ESP8266 Applications
Prototyping of IoT devices
Low power battery operated applications
Network projects
Projects requiring multiple I/O interfaces with Wi-Fi and Bluetooth functionalities
Home appliances
Home automation
Smart plugs and lights
Industrial wireless control
Baby monitors
IP cameras
Sensor networks
Wearable electronics
Wi-Fi location-aware devices
Security ID tags
Wi-Fi position system beacons
ESP8266 Features
802.11 b/g/n support
802.11 n support (2.4 GHz), up to 72.2 Mbps
Defragmentation
2 x virtual Wi-Fi interface
Automatic beacon monitoring (hardware TSF)
Support Infrastructure BSS Station mode/SoftAP mode/Promiscuous mode
ESP8266 Manufacturer
Espressif Systems is a public multinational, fabless semiconductor company, headquartered in Shanghai and offices in China, India, Brazil, Singapore, and Czechia. As a complete solution provider, we specialize in producing highly-integrated, low-power, Wi-Fi-and-Bluetooth SoCs. Among our most popular IoT solutions are the ESP8266 and ESP32 series of chips, modules, and development boards.
ESP8266 Functional Block Diagram

ESP8266 Package

ESP8266 with Arduino IDE
The NodeMCU Development Board can be easily programmed with Arduino IDE since it is easy to use.
Programming NodeMCU with the Arduino IDE will hardly take 5-10 minutes. All you need is the Arduino IDE, a USB cable, and the NodeMCU board itself.
Which one is better ESP32 or ESP8266?
Is it better to use an ESP32 or an ESP8266? It is up to you to decide what you want to do.
Because ESP32 has more functionality than ESP8266, such as a CPU core, faster Wi-Fi, Bluetooth 4.0 (BLE), touch sensitivity pins, and built-in Hall Effect sensors and temperature sensors, it is superior to ESP8266. In comparison to the ESP8266, the ESP32 features more GPIO pins. The ESP32 includes ten capacitive GPROS that can detect touch and activate events. A trigger event is a circuit in which an input pulse initiates action, such as in a radar module.
The ESP8266 is a more affordable version of the ESP32. Despite the fact that it lacks a few functions, it is adequate for the majority of simple DIY IoT applications. However, the GPIO mapping has significant limitations, and you may not have enough pins to accomplish your goals. An ESP32 is the way to go if that's the case.
Trend Analysis
Datasheet PDF
- Datasheets :
Parts with Similar Specs
What is PWM IC?
The TL494 fixed frequency PWM Controller can be used for DC to DC conversion regardless of buck or boost topology. ... This IC feature an output control circuit, a flip flop, a dead time comparator, two different error amplifiers, a 5V reference voltage, an oscillator, and a PWM comparator.
What is better esp32 vs esp8266?
The ESP32 is much more powerful than the ESP8266, comes with more GPIOs with multiple functions, faster Wi-Fi, and also supports Bluetooth. Many people think that the ESP32 is more difficult to deal with than the ESP8266 because it is more complex.
What is esp8266 used for?
The ESP8266 WiFi Module is a self-contained SOC with an integrated TCP/IP protocol stack that can give any microcontroller access to your WiFi network. The ESP8266 is capable of either hosting an application or offloading all WiFi networking functions from another application processor.
What is the ESP8266?
ESP8266 is a wifi SOC (system on a chip) produced by Espressif Systems. It is a highly integrated chip designed to provide full internet connectivity in a small package.
Why is ESP32 special?
ESP32 devices have more GPIO to work with, making them more useful in complex applications. Because many ESP32 development boards have small cameras, the ESP32 appears to be a very capable device.
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