ESP32-S3 Super Mini

Development Board

Code name: ESP32S3_DEV

ESP32-S3 Super Mini is a development board based on the ESP32S3 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 4MB flash memory.

About ESP32-S3 Super Mini

🚀 The ESP32-S3 SuperMini is a compact and powerful IoT development board based on the Espressif ESP32-S3 WiFi/Bluetooth dual-mode chip. Featuring a dual-core Xtensa LX7 processor running up to 240 MHz, it delivers impressive performance for your embedded projects. ⚡

📡 For seamless wireless connectivity, it supports WiFi 802.11b/g/n and Bluetooth 5 (LE), making it ideal for IoT applications. Just like the ESP32-C3 SuperMini, this board includes a built-in PCB antenna, ensuring reliable signal strength without requiring an external antenna.

💾 Equipped with 512 KB SRAM and 4 MB flash memory, there's plenty of space for your firmware and applications. Its ultra-compact design (22.52 x 18 mm) makes it easy to embed into small projects

🆚 Wondering how the ESP32-S3 SuperMini compares to other SuperMini boards? Check out our full comparison guide to see how it stacks up against the C3, C3 Plus, C6, and H2.

Where to Buy ESP32-S3 Super Mini

Starting from

5$ per unit

Amazon.com Ships worldwide

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Amazon.de Ships to EU

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ESP32-S3 Super Mini Technical Specifications

🔌 USB

Type: USB-C

Serial Chip: Native

🛰️ Connectivity

WiFi: 802.11 b/g/n (2.4 GHz)

Bluetooth: 5.0

BLE: 5.0

🧠 Microcontroller

Model: esp32s3

Clock Speed: 240 MHz

Flash Size: 4MB

Architecture: xtensa

✨ Features

Ultra-small size: 22.52 x 18 mm
Ultra-low power consumption: deep sleep power consumption of about 43μA
Onboard WS2812 RGB LED for programmable multi-color status indication
Dual-core Xtensa LX7 CPU running at up to 240 MHz
512 KB SRAM, 384 KB ROM built-in, with 4 MB Flash
Secure encryption features: AES-128/256, RSA, HMAC, digital signatures, and secure startup
11 digital IO pins
22 external interrupt pins
6 analog input pins
11 PWM pins

View Full Datasheet

ESP32-S3 Super Mini Dimensions

Width 18 mm

Length 23.50 mm

Pin Gap 2.54 mm

ESP32-S3 Super Mini Case / Enclosure

Looking for a case to finish up your project with ESP32-S3 Super Mini? Check our Etsy Store

We offer a variety of enclosures for the ESP32 S3 Super Mini, available in different colors and configurations – with or without header pins, and more! You can also choose between a hexagon-patterned lid for improved heat dispersion ❄️ or a solid lid for a sleek finish.

On our Etsy Store, you can find cases for different ESP32 development boards, the ESP32 boards with sensors, screens, etc. The stock is always filling up!

Need a custom case? Contact Us on Etsy Store or Contact Form

ESP32-S3 Super Mini Pinout

The ESP32-S3 Super Mini pinout is designed for maximum functionality in a compact package. The board provides essential power pins like 5V, 3.3V, and GND for stable power delivery.

It includes communication interfaces such as RX and TX for UART, SDA and SCL for I2C, and MISO, MOSI, SCK, and SS for SPI, ensuring seamless integration with peripherals.

For analog input, the ESP32-S3 Super Mini offers ADC pins labeled A0 to A5, making it suitable for sensor data acquisition. Additionally, it features an onboard WS2812 RGB LED, which allows programmable multi-color status indications for enhanced user feedback.

Safe Pins to Use

For general GPIO usage, these are the safest and most flexible choices:

IO1

IO2

IO4

IO5

IO6

IO7

IO8

IO15

IO16

IO17

IO18

IO21

Why Are These Pins Safe?

• Not involved in bootstrapping → No impact on device boot mode or system startup
• Not linked to flash memory or PSRAM → Won't interfere with storage or memory access
• Not dedicated to USB or JTAG → Free for general use without affecting debugging
• No special hardware connections → Freely assignable without internal conflicts

Pins to Avoid or Use with Caution

Some pins are reserved for critical functions like bootstrapping, JTAG debugging, USB communication, and flash memory operations. Misusing these pins may lead to boot failures, programming issues, USB conflicts, or disruptions in flash storage.

Critical Pin Categories:

Strapping Pins: Control boot behavior and flash voltage selection
JTAG Debugging Pins: Required for low-level debugging
USB Communication Pins: Used for USB Serial/JTAG communication
Flash Memory & SPI Pins: Connected to SPI flash memory and PSRAM
UART Serial Communication Pins: Used for debugging and firmware uploads

PIN	Label	Reason	Function
IO3	GPIO3	Sampled at reset to select JTAG interface (USB Serial/JTAG controller vs. external pins). Improper use can disable external JTAG or alter debug interface.	🛠️ Strapping
IO9	FSPIHD	Connected to external flash (data/hold signal) on most modules. Not recommended for use as GPIO, since it must remain dedicated to flash communication.	⚡ Flash
IO10	FSPICS0	Used to select the external flash chip. It is required for flash access and cannot be repurposed without losing flash connectivity	⚡ Flash
IO11	FSPID	Used as a data line for flash (and in-package PSRAM). It should not be used as GPIO when the flash/PSRAM is in use.	⚡ Flash
IO12	FSPICLK	Drives the flash (and PSRAM) clock. This critical signal must be reserved for memory and not used as general GPIO.	⚡ Flash
IO13	FSPIQ	Used as a data line for flash/PSRAM transfers. Not available for other uses when flash/PSRAM is connected.	⚡ Flash
IO14	FSPIWP	Connected to external flash (data/write-protect signal). Not recommended as GPIO because it’s reserved for flash operations.	⚡ Flash
IO33	FSPIHD	On chips/modules with integrated flash, this IO is wired to the flash hold pin internally. It cannot be reassigned to GPIO without breaking flash access.	⚡ Flash
IO34	FSPICS0	Wired to the chip select of the internal flash in flash-equipped variants. It must remain low during flash operation, so it’s not available for other use.	⚡ Flash
IO35	FSPID / PSRAM_D0	In modules with octal PSRAM, this pin is connected to the PSRAM data line. It is reserved for memory interface and not free for general GPIO when flash/PSRAM is present.	⚡ Flash
IO36	FSPICLK / PSRAM_CLK	In modules with octal PSRAM, this pin drives the PSRAM clock. It must be dedicated to the memory interface, not used as a regular GPIO when that interface is in use.	⚡ Flash
IO37	FSPIQ / PSRAM_DQS	In modules with octal PSRAM, this pin is connected to the PSRAM’s DQS signal. It cannot be repurposed without disrupting the PSRAM/flash communication.	⚡ Flash
IO38	FSPIWP	On flash-equipped chips, this pin is tied to the flash’s WP# (or D3) line. It should be avoided for other use, as it’s needed for flash operations.	⚡ Flash
IO39	MTCK (GPIO39)	Default JTAG debugging TCK pin. If JTAG is needed, this pin must be free; it may also be used internally for PSRAM chip select on certain modules, so avoid repurposing it.	🪛 Other
IO40	MTDO (GPIO40)	Default JTAG TDO output for debugging. Using it as GPIO will interfere with JTAG debugging functionality.	🪛 Other
IO41	MTDI (GPIO41)	Default JTAG TDI input for debugging. Should be reserved for JTAG or left unused if JTAG is to remain available.	🪛 Other
IO45	GPIO45	Determines flash/PSRAM power voltage (3.3 V vs 1.8 V) at boot. Must match hardware configuration; using as GPIO can upset flash supply setting.	🛠️ Strapping
IO46	GPIO46	Must be at a defined level during reset (with GPIO0) to select normal or download boot and UART/USB print mode. This pin is input-only (no output drive), so it should be left for its intended strapping function.	🛠️ Strapping
IO47	SPICLK_P	Used only on variants with Octal SPI interface (e.g. ESP32-S3R16V) as part of the differential clock pair. On such chips it operates at 1.8 V and is reserved for the high-speed octal SPI clock, not for general GPIO use.	⚡ Flash
IO48	SPICLK_N	Used only on variants with Octal SPI interface, as the negative leg of the differential clock&. On such chips it operates at 1.8 V; it should be avoided for GPIO to prevent conflicts with the octal flash/PSRAM clock.	⚡ Flash

ESP32-S3 Super Mini On-Board LEDs

The ESP32-S3 Supermini features multiple onboard LEDs, each mapped to specific GPIO pins. Below is a breakdown of their functions, pin assignments, and how to use them in both Arduino and ESPHome.

🔴 Red LED – Power Indicator

GPIO: GPIO48
Control: digitalWrite()
⚠️ Both the Red LED and WS2812 share GPIO48 and use different signal types (digital vs. timing-based), but due to the board’s fixed hardware design, they cannot be used independently - any signal sent to GPIO48 will affect both, potentially causing flickering or unexpected behavior.

Arduino Example:


void setup() {
  pinMode(48, OUTPUT);
}

void loop() {
  digitalWrite(48, HIGH);
  delay(1000);
  digitalWrite(48, LOW);
  delay(1000);
}

ESPHome Example:


output:
  - platform: gpio
    pin: 48
    id: red_led

light:
  - platform: binary
    name: "Red LED"
    output: red_led

ESPHome GPIO Output Documentation →

🔵 Blue LED – Battery Charge Indicator

GPIO: None
Control: None
Behavior:

⚡ Charging → LED on
✅ Battery connected → LED off
🔋 No battery → LED blinks

🌈 WS2812 LED – Programmable RGB

GPIO: GPIO48
Control: FastLED, NeoPixel, etc.
⚠️ Both the Red LED and WS2812 share GPIO48 and use different signal types (digital vs. timing-based), but due to the board’s fixed hardware design, they cannot be used independently - any signal sent to GPIO48 will affect both, potentially causing flickering or unexpected behavior.

Arduino (FastLED) Example:

#include <FastLED.h>

#define NUM_LEDS 1
#define DATA_PIN 48

CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
}

void loop() {
  leds[0] = CRGB::Red; FastLED.show(); delay(1000);
  leds[0] = CRGB::Green; FastLED.show(); delay(1000);
  leds[0] = CRGB::Blue; FastLED.show(); delay(1000);
}

ESPHome (NeoPixelBus) Example:

light:
  - platform: neopixelbus
    type: GRB
    pin: 48
    num_leds: 1
    name: "Onboard RGB LED"

ESPHome NeopixelBus Documentation →

ESP32-S3 Super Mini Useful Links

Datasheet

https://ae01.alicdn.com/kf/S47f3120f532e4c78811801f40c8208aaD.png

ESP32S3 Datasheet

https://www.espressif.com/sites/default/files/documentation/esp32-s3_datasheet_en.pdf

ESP32-S3 Super Mini Custom Pins

This development board provides 11 digital IO pins, out of which 22 can be used as external interrupt pins , 6 as analog input pins and 11 pins have Pulse-Width Modulation (PWM).

Pin	Function	ESP Pin	Input/Output	Description
1	5V	5V	POWER INPUT	5V power input for the board
2	GND	GND	POWER GROUND	Ground connection
3	3V3	3.3V	POWER OUTPUT	3.3V power output for peripherals
4	TX	TX	TX	TX
5	RX	RX	RX	RX
6	IO1	GP1	BIDIRECTIONAL	GPIO, ADC Pin
7	IO2	GP2	BIDIRECTIONAL	GPIO, ADC pin
8	IO3	GP3	BIDIRECTIONAL	GPIO, ADC pin
9	IO4	GP4	BIDIRECTIONAL	GPIO, ADC pin
10	IO5	GP5	BIDIRECTIONAL	GPIO, ADC pin
11	IO6	GP6	BIDIRECTIONAL	GPIO, ADC pin
12	IO7	GP7	BIDIRECTIONAL	GPIO, ADC pin
13	IO8	GP8	BIDIRECTIONAL	GPIO, ADC pin
14	IO9	GP9	BIDIRECTIONAL	GPIO, ADC pin
15	IO10	GP10	BIDIRECTIONAL	GPIO, ADC pin
16	IO11	GP11	BIDIRECTIONAL	GPIO, ADC pin
17	IO12	GP12	BIDIRECTIONAL	GPIO, ADC pin
18	IO13	GP13	BIDIRECTIONAL	GPIO, ADC pin
19	IO14	GP14	BIDIRECTIONAL	GPIO, ADC pin
20	IO15	GP15	BIDIRECTIONAL	GPIO, ADC pin
21	IO16	GP16	BIDIRECTIONAL	GPIO, ADC pin
22	IO17	GP17	BIDIRECTIONAL	GPIO
23	IO18	GP18	BIDIRECTIONAL	GPIO
24	IO21	GP21	BIDIRECTIONAL	GPIO
25	IO33	GP33	BIDIRECTIONAL	GPIO
26	IO34	GP34	BIDIRECTIONAL	GPIO
27	IO35	GP35	BIDIRECTIONAL	GPIO
28	IO36	GP36	BIDIRECTIONAL	GPIO
29	IO37	GP37	BIDIRECTIONAL	GPIO
30	IO38	GP38	BIDIRECTIONAL	GPIO
31	IO39	GP39	BIDIRECTIONAL	GPIO
32	IO40	GP40	BIDIRECTIONAL	GPIO
33	IO41	GP41	BIDIRECTIONAL	GPIO
34	IO45	GP45	BIDIRECTIONAL	GPIO
35	IO46	GP46	BIDIRECTIONAL	GPIO
36	IO47	GP47	BIDIRECTIONAL	GPIO
37	IO48	GP48	BIDIRECTIONAL	GPIO

Function Pin Function

ESP Pin Pin on ESP32

I/O Input/Output Pin

Description Pin Description

ESP32-S3 Super Mini Pin Mappings

Below you can find the ESP32-S3 Super Mini pinout. This development board provides 11 digital IO pins, out of which 22 can be used as external interrupt pins, 6 as analog input pins and 11 pins have Pulse-Width Modulation (PWM).

Pin	Analog	Other
0	A0
1	A1
2	A2
3	A3
4	A4	SCK
5	A5	MISO
6		MOSI
7		SS
8		WS2812_RGB SDA
9		SCL
20		RX
21		TX

Analog Analog input pins

Touch Touch pins

PWM Pulse-Width Modulation

RX / TX Receive/Transmit

LED_BUILTIN Built-in LED

Function Other functions

Default Tools for ESP32-S3 Super Mini

Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	0x0
Flash mode	qio
Boot mode	qio
Maximum upload size	1280 Kb (1310720 B)
Maximum data size	320 Kb (327680 B)

The ESP32-S3 Super Mini development board by default uses esptool_py uploader tool, network uploader tool for Over-the-air (OTA) uploads and esptool_py bootloader tool. The bootloader starts at address "0x0". Flash mode and boot mode for ESP32-S3 Super Mini development board by default is qio and qio respectively.